{"title":"Alternator","description":"\u003ch2\u003eMarine alternator: choosing the right engine charging system\u003c\/h2\u003e\n\u003cp\u003eA marine alternator converts engine rotation into direct current to recharge batteries and power onboard consumers. The right choice depends on system voltage, usable current output, mechanical mounting on the engine, and how charging is regulated.\u003c\/p\u003e\n\n\u003ch3\u003eReplacement or enhanced charging\u003c\/h3\u003e\n\u003cp\u003eTo replace an original alternator or add serious output on a compatible engine, the \u003ca href=\"\/en-us\/products\/mastervolt-alternateur-alpha-compact-28-150-volvo-penta-24v\"\u003eAlpha Compact 28\/150 Volvo Penta alternator\u003c\/a\u003e targets 24V installations requiring high current in a compact format. Variants such as the \u003ca href=\"\/en-us\/products\/mastervolt-alternateur-alpha-compact-28-150-regulateur-alpha-pro-iii\"\u003eAlpha Compact 28\/150 with Alpha Pro III\u003c\/a\u003e and the \u003ca href=\"\/en-us\/products\/mastervolt-alternateur-alpha-compact-28-150-sans-poulie\"\u003eAlpha Compact 28\/150 without pulley\u003c\/a\u003e address setups where regulation or pulley configuration must be adapted to the engine.\u003c\/p\u003e\n\n\u003ch3\u003e12V, 24V and usable current\u003c\/h3\u003e\n\u003cp\u003eA 12V alternator suits standard house or start batteries, while a 24V alternator is for boats with more powerful systems or demanding equipment. The \u003ca href=\"\/en-us\/products\/mastervolt-alternateur-alpha-12-130-iii-regulateur-alpha-pro\"\u003eMastervolt Alpha 12\/130 III with Alpha Pro\u003c\/a\u003e covers reinforced 12V needs, while the \u003ca href=\"\/en-us\/products\/mastervolt-alternateur-alpha-24v-150a-evo-alpha-pro-iii-masterbus\"\u003eAlpha 24V 150A EVO with Alpha Pro III MasterBus\u003c\/a\u003e targets integrated 24V architectures.\u003c\/p\u003e\n\n\u003ch3\u003eRegulation, temperature and wiring\u003c\/h3\u003e\n\u003cp\u003eRegulation is critical to properly exploit the alternator, especially with AGM, gel or lithium batteries. An \u003ca href=\"\/en-us\/products\/mastervolt-regulateur-charge-alpha-pro-iii-electricite\"\u003eAlpha Pro III regulator\u003c\/a\u003e controls the charging curve, an \u003ca href=\"\/en-us\/products\/mastervolt-capteur-temperature-alternateur-cable-2m\"\u003ealternator temperature sensor\u003c\/a\u003e helps protect the unit, and an \u003ca href=\"\/en-us\/products\/mastervolt-kit-cablage-alpha-pro\"\u003eAlpha Pro wiring kit\u003c\/a\u003e simplifies connections. \u003ca href=\"\/en-us\/products\/mastervolt-poulie-multi-gorges-6-alternateur-alpha\"\u003eMulti-groove pulleys\u003c\/a\u003e allow drive adaptation when engine configuration requires it.\u003c\/p\u003e\n\n\u003ch3\u003eBefore choosing\u003c\/h3\u003e\n\u003cp\u003eVerify system voltage, mechanical compatibility, available space, battery type and charge cable capacity. For a complete setup, also check compatibility with the \u003ca href=\"\/en-us\/collections\/production\"\u003epower production\u003c\/a\u003e, \u003ca href=\"\/en-us\/collections\/batteries\"\u003ebatteries\u003c\/a\u003e, \u003ca href=\"\/en-us\/collections\/stockage\"\u003estorage\u003c\/a\u003e and \u003ca href=\"\/en-us\/collections\/moniteurs-de-batterie\"\u003ebattery monitors\u003c\/a\u003e collections.","products":[{"product_id":"mastervolt-alternateur-alpha-12-130-iii-regulateur-alpha-pro","title":"Alpha 12\/130 III alternator incl. Alpha Pro III","description":"\u003cp\u003eDesigned to meet the energy requirements of modern vessels, the \u003cstrong\u003eAlpha 12\/130 III alternator\u003c\/strong\u003e from \u003cstrong\u003eMastervolt\u003c\/strong\u003e turns your engine into a high-performance energy source. Unlike standard alternators that require high engine speeds to deliver their rated capacity, this 130 A model is specifically optimized to provide full charging power even at low speeds. It offers a silent and efficient alternative to installing a generator, particularly when used as a secondary alternator in combination with a high-capacity battery bank.\u003c\/p\u003e\n\n\u003ch3\u003eSmart regulation with Alpha Pro III\u003c\/h3\u003e\n\u003cp\u003eThe integrated \u003cstrong\u003eAlpha Pro III\u003c\/strong\u003e charge regulator ensures optimal efficiency and extends battery life. With its 3-stage charging process (Absorption at 14.25 V and Float at 13.25 V), this system is compatible with lead-acid and lithium-ion battery banks. The regulator precisely controls output voltage and current, preventing overcharging while ensuring fast recharging. Adding a Battery Mate-type charge distributor allows simultaneous management of multiple banks (start and service) safely.\u003c\/p\u003e\n\n\u003ch3\u003eMechanical and thermal design for marine environments\u003c\/h3\u003e\n\u003cp\u003eWeighing 10.1 kg and featuring an insulated design, this 12 VDC alternator is built for harsh environments. Its bidirectional fan provides powerful forced cooling, enabling it to maintain high performance even in engine rooms where temperatures exceed 40 °C. Supplied as standard with a double V-belt pulley (2xA section, 89 mm nominal diameter) and featuring a \"six o'clock\" mounting type, it adapts to many engine mounts. Unlike the Alpha Compact range, the classic Alpha series offers bidirectional rotation, facilitating integration into a wider variety of mechanical configurations.\u003c\/p\u003e","brand":"Mastervolt","offers":[{"title":"Default Title","offer_id":53723874689364,"sku":"48612130","price":1238.69,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0988\/3274\/4788\/files\/main-square_838c21e8-4465-42fd-80c5-6672b3f34442.jpg?v=1778053269"},{"product_id":"mastervolt-alternateur-alpha-24v-110a-energie","title":"Alpha 24 V 110 A Alternator","description":"\u003cp\u003e\n    The Mastervolt Alpha 24V 110A alternator (part number 48224110) is designed for demanding marine power systems, providing a high-performance charging solution for 24V service battery banks. With a 110A output current, it ensures fast and efficient recharging.\n\u003c\/p\u003e\n\n\u003ch3\u003eEngine integration and compatibility\u003c\/h3\u003e\n\u003cp\u003e\n    This alternator stands out for its flexible installation on various engine configurations. It can be mounted as a second alternator on Volvo Penta D4 engines (D4-180I-F to D4-300I-F) and D6 engines (D6-280I-A to D6-435I-WJ-F) using Volvo Penta bracket part number 3584501. Similarly, on MD20 engines (MD2010C to MD2040D), it can be installed as a second alternator via Volvo Penta bracket part number 3581049.\n\u003c\/p\u003e\n\u003cp\u003e\n    For Volvo Penta D2 engines (D2-55C to D2-75F), the Alpha 24V 110A alternator can replace the standard alternator. This setup requires a specific kit (Volvo Penta part number 3885212) to relocate the original alternator to power the engine. An additional wiring harness (Volvo Penta part number 3886482) is required to connect the standard 12V alternator in its new position. On 2000 series engines (2002, 2003, 2003T, etc.), the Mastervolt Alpha alternator can also be installed as a replacement, with necessary adjustments. The 24V 110A model weighs 10.1 kg, ensuring robust construction suitable for marine environments.\n\u003c\/p\u003e\n\n\u003ch3\u003ePosition in the Alpha range\u003c\/h3\u003e\n\u003cp\u003e\n    The Alpha 24V 110A alternator is part of Mastervolt’s full Alpha alternator range, which also includes the 12\/90A, 12\/130A, 24\/75A, and 24\/150A models. This variety allows the charging solution to be tailored to the specific needs of each installation, whether in terms of voltage or power. Although the technical documentation dates from 2013, the product remains listed with a 2025 Q2 price, confirming its ongoing relevance and market availability as a high-performance alternative to original alternators or for adding dedicated charging capacity for service systems. It is not designed as a universal replacement part but as a power optimization component, requiring specific installation brackets and kits not included with the alternator itself.","brand":"Mastervolt","offers":[{"title":"Default Title","offer_id":53723874885972,"sku":"48224110","price":1019.38,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0988\/3274\/4788\/files\/main-square_17d4dda1-5702-4a71-8bca-df6eccff2394.jpg?v=1778059834"},{"product_id":"mastervolt-alternateur-alpha-24v-150a-evo-alpha-pro-iii-masterbus","title":"Alpha 24 V 150 A EVO Alternator with Alpha Pro III","description":"\u003cp\u003e\n    The \u003cstrong\u003eMastervolt Alpha 24V 150A EVO\u003c\/strong\u003e alternator, paired with the \u003cstrong\u003eAlpha Pro III\u003c\/strong\u003e charge regulator, is a high-efficiency marine power generation solution designed to replace the use of a diesel generator. Unlike first-fit models that require high engine RPM, this unit is specifically calibrated to deliver maximum charging current at low RPM and idle. This system ensures rapid and complete charging of service and starting battery banks.\n\u003c\/p\u003e\n\n\u003ch3\u003eElectrical performance and intelligent regulation\u003c\/h3\u003e\n\u003cp\u003e\n    This model delivers a total current of 150 A at a system voltage of 24 VDC. Control is provided by the Alpha Pro III regulator (firmware version 4.0 or higher), which enforces a 3+ stage intelligent charging cycle. Setpoint voltages are fixed at 28.5 V for absorption and 26.5 V for float (measured at 25°C). The system includes a temperature probe for thermal compensation of the charge, thus optimizing the lifespan of lead-acid and lithium-ion battery banks. It also integrates the \"Keep Alive\" function and natively communicates via the MasterBus protocol, enabling configuration, real-time monitoring, alarm management, and event history, particularly when paired with a MasterShunt. The connection between the alternator and the regulator is via a 1.5-meter hydrocarbon-resistant marine-grade cable supplied as standard.\n\u003c\/p\u003e\n\n\u003ch3\u003eMechanical specifications and thermal tolerance\u003c\/h3\u003e\n\u003cp\u003e\n    The alternator weighs 13.1 kg and operates with electrical isolation from ground. It features bidirectional rotation, adapting to various engine configurations. To efficiently transmit power without premature wear, it is equipped with a double pulley (2xA belt section) with a nominal diameter of 89 mm. Thermal management is ensured by a forced-cooling system via an integrated pulley fan, maintaining output power even in engine compartments where ambient temperature exceeds 40°C. Mounting options are flexible thanks to multiple mounting points (positions five to six, six o’clock, and five after six), facilitating installation on custom mounts.\n\u003c\/p\u003e\n\n\u003ch3\u003ePositioning and technical comparison\u003c\/h3\u003e\n\u003cp\u003e\n    Within the Mastervolt range, the Alpha 24\/150 EVO stands as the \"heavy-duty\" solution compared to lower-capacity models like the 24\/75, doubling the charging capacity for vessels with high energy demands (air conditioning, watermakers). Compared to standard OEM alternators, the Alpha EVO eliminates the issue of voltage collapse at high temperatures. When compared to direct competitors such as the Balmar XT or AT series, Mastervolt’s positioning stands out due to native and seamless integration with the MasterBus ecosystem without requiring additional gateways, as well as the systematic inclusion of the external Alpha Pro III regulator. Paired with a Battery Mate distributor, this alternator can simultaneously charge up to three separate battery banks with near-zero voltage drop.\n\u003c\/p\u003e","brand":"Mastervolt","offers":[{"title":"Default Title","offer_id":53723875082580,"sku":"48624152","price":2303.03,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0988\/3274\/4788\/files\/main-square_d08edc29-ac8d-45d2-b1be-13875cdee7c0.jpg?v=1778059840"},{"product_id":"mastervolt-alternateur-alpha-compact-14-120-alpha-pro-iii","title":"Alpha Compact 14\/120 Alternator with Alpha Pro III","description":"\u003ch3\u003eAlpha Compact 14\/120 Alternator with Alpha Pro III Regulator\u003c\/h3\u003e\n\u003cp\u003e\n    The \u003cstrong\u003eAlpha Compact 14\/120 Alternator\u003c\/strong\u003e by \u003cstrong\u003eMastervolt\u003c\/strong\u003e (reference 46614120) is a high-performance charging system designed for marine and mobile energy storage installations. Operating on a 12 V network (14 V charging voltage) with a 120 A output current, it is specifically optimized to deliver high power continuously, even at low engine speeds (idle). The unit weighs 6.7 kg and features an open construction with an integrated dual internal fan for optimal cooling, even in high ambient temperature environments.\n\u003c\/p\u003e\n\n\u003ch3\u003eComparison with standard alternators and the Alpha range\u003c\/h3\u003e\n\u003cp\u003e\n    Unlike OEM alternators installed by default by engine manufacturers, or Mastervolt’s standard Alpha range, the \u003cstrong\u003eAlpha Compact\u003c\/strong\u003e series stands out with a 25 % smaller footprint and 40 % lighter weight. Its patented magnetic design reduces fuel consumption by 30 to 40 % compared to equivalent competitors. Designed to fit directly onto factory power take-off (PTO) mounts, it offers a superior alternative to basic alternators, capable of handling the intensive charging cycles required by modern service battery banks.\n\u003c\/p\u003e\n\n\u003ch3\u003eTechnical specifications and wiring\u003c\/h3\u003e\n\u003cp\u003e\n    This alternator features a clockwise rotation direction and is mounted using a swivel arm. It includes two M8 positive output studs, an isolated W (RPM) signal connection via Faston terminal, and a dedicated Mastervolt connector for excitation current. By default, the system is not galvanically isolated (negative pole connected to the housing), but isolated operation is possible by installing optional insulating sleeves. Cables and electronics are sealed against oil, moisture, and contaminants. Note that the multi-groove free-wheel pulley is not included, allowing selection of the exact diameter suited to the installation.\n\u003c\/p\u003e\n\n\u003ch3\u003eAdvanced regulation with Alpha Pro III and MasterBus compatibility\u003c\/h3\u003e\n\u003cp\u003e\n    The package includes the \u003cstrong\u003eAlpha Pro III\u003c\/strong\u003e charge regulator (firmware 4.0 or higher), which transforms this alternator into a true three-stage (Bulk, Absorption, Float) smart charger. It is compatible with lead-acid, Gel, AGM, and Lithium-Ion battery banks. The charging process is temperature-compensated via an integrated probe (RJ12 connection) to prevent overcharging. The Alpha Pro III is fully connectable to the MasterBus network for real-time monitoring of RPM, charge state, and alarm configuration. It also features an engine load balancing function to reduce mechanical wear and a \"Keep alive\" function ensuring reliable signal transmission to the onboard tachometer.","brand":"Mastervolt","offers":[{"title":"Default Title","offer_id":53723875246420,"sku":"46614120","price":2111.58,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0988\/3274\/4788\/files\/main-square_e9daf780-7bec-49ab-91a9-36c563fad4ae.jpg?v=1778053088"},{"product_id":"mastervolt-alternateur-alpha-compact-14-140-vp-alpha-pro-iii-12v","title":"Alpha Compact 14\/140 VP Alternator with Alpha Pro III","description":"\u003cp\u003eThe \u003cstrong\u003eAlpha Compact 14\/140 VP\u003c\/strong\u003e alternator from \u003cstrong\u003eMastervolt\u003c\/strong\u003e is a high-performance marine energy production solution, specifically designed to fit Volvo Penta engines via its saddle mount. Delivering a nominal current of 140 A at a 12 V system voltage, it stands out from the standard Alpha series with its reduced footprint and optimized cooling thanks to an integrated dual-fan system, allowing it to operate up to 120 °C. For its drive, this alternator requires a 4.8 kW power take-off (PTO) on the engine.\u003c\/p\u003e\n\u003ch3\u003eIntegrated Alpha Pro III smart regulator\u003c\/h3\u003e\n\u003cp\u003eThis kit includes the advanced \u003cstrong\u003eAlpha Pro III\u003c\/strong\u003e charge regulator, turning this alternator into a three-stage smart charger (Bulk, Absorption, Float). Unlike standard regulators, it automatically compensates the charging voltage based on temperature (-30 mV\/°C at 12 V) to effectively protect battery banks (lead, gel, AGM, or lithium-ion). Fully compatible with the MasterBus communication network via its two RJ-45 ports, it provides complete system monitoring, including alternator temperature, excitation current, and voltage alarms, facilitating integration with other equipment such as the MasterShunt.\u003c\/p\u003e\n\u003ch3\u003eReady for installation\u003c\/h3\u003e\n\u003cp\u003eThe Alpha Compact 14\/140 VP alternator is supplied ready-to-use with a standard pulley for 8-rib multi-groove belt (48.1 mm diameter). The kit also includes a hydrocarbon-resistant wiring harness, a battery temperature sensor, and robust connections, including an M8 stud for the positive terminal. While not isolated by default, an insulating bushing kit is available as an option for systems requiring strict galvanic isolation.\u003c\/p\u003e","brand":"Mastervolt","offers":[{"title":"Default Title","offer_id":53723875410260,"sku":"46614142","price":1967.88,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0988\/3274\/4788\/files\/main-square_643623ab-fed6-4f4b-a2c3-97445cd0887b.jpg?v=1778053117"},{"product_id":"mastervolt-alternateur-alpha-compact-14-200-alpha-pro-iii-12v","title":"Alpha Compact 14\/200 Alternator with Alpha Pro III","description":"\u003cp\u003eThe \u003cstrong\u003eAlpha Compact 14\/200\u003c\/strong\u003e alternator from \u003cstrong\u003eMastervolt\u003c\/strong\u003e is the ultimate solution for high-energy demands onboard. Designed specifically for demanding marine environments, it delivers a powerful nominal current of 200 A at 12 V, ensuring rapid charging of your battery banks, whether they are lead-acid (acid, gel, AGM) or lithium-ion. Unlike standard alternators that require high engine speeds, the Alpha Compact provides exceptional output even at low speeds (generation speed at 1350 rpm), making it ideal for harbor maneuvers or extended anchoring.\u003c\/p\u003e\n\u003ch3\u003eAlpha Pro III charge regulator included\u003c\/h3\u003e\n\u003cp\u003eThis model comes standard with the intelligent \u003cstrong\u003eAlpha Pro III\u003c\/strong\u003e charge regulator, which optimizes the process through its three-stage charging algorithm (Bulk, Absorption, Float). It automatically adjusts the voltage (up to 14.25 V in Bulk and Absorption) and compensates for temperature (-30 mV\/°C at 12 V) thanks to the supplied battery temperature sensor. This preserves the lifespan of your batteries while maximizing energy efficiency. Additionally, its full integration with the MasterBus network allows for advanced monitoring and configuration from a display or centralized system.\u003c\/p\u003e\n\u003ch3\u003eRobust design and thermal performance\u003c\/h3\u003e\n\u003cp\u003eEquipped with a patented magnetic design and optimized cooling, the Alpha Compact 14\/200 alternator supports a maximum operating temperature of 120 °C. With a compact weight of 7.5 kg and a power input of 5.6 kW (7.6 HP), it fits perfectly into compact engine compartments. Its ability to withstand rotation speeds up to 20,000 rpm makes it an extremely reliable and durable piece of equipment compared to standard Alpha models, positioning it as a top choice for demanding sailors.","brand":"Mastervolt","offers":[{"title":"Default Title","offer_id":53723875606868,"sku":"46614200","price":2199.74,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0988\/3274\/4788\/files\/main-square_d978d8b9-f4e2-472d-9893-601a0ddf7052.jpg?v=1778053146"},{"product_id":"mastervolt-alternateur-alpha-compact-28-110-24v","title":"Alpha Compact 28\/110 Alternator","description":"\u003cp\u003eMastervolt’s Alpha Compact 28\/110 alternator is a high-performance energy generation solution designed specifically for demanding marine environments. Capable of continuous operation under the high temperatures of an engine room, this 24V model delivers 110A to ensure rapid charging of your service and starter battery banks. Unlike standard alternators often limited by heat, the Alpha Compact series maintains optimal mechanical and electrical efficiency even at full load.\u003c\/p\u003e\n\u003ch3\u003eIntegration and charge regulation\u003c\/h3\u003e\n\u003cp\u003eThis model is designed to operate in synergy with the external Alpha Pro charge regulator (sold separately). This combination enables a precise 3-stage charging algorithm, essential for maximizing the lifespan and performance of lead-acid and lithium-ion (Li-ion) battery banks. Whether used as a primary or secondary alternator, it converts your engine’s mechanical power into a reliable and regulated electrical energy source.\u003c\/p\u003e\n\u003ch3\u003eMechanical specifications and installation\u003c\/h3\u003e\n\u003cp\u003eMastervolt’s Alpha Compact 28\/110 alternator weighs 7.4 kg and requires clockwise rotation (viewed from the pulley side) to ensure proper operation of its internal cooling fans. Unlike the classic Alpha series (such as the standard 24\/110), which features a bidirectional fan, rotation direction is critical here. Additionally, this model is supplied as standard non-insulated (grounded to the housing) and without a pulley. For engines requiring insulated mounting to protect onboard electronics, the optional insulating bushing kit (reference 48420242) must be used, which will reduce the diameter of the mounting holes when installed on the mounting bracket.\u003c\/p\u003e","brand":"Mastervolt","offers":[{"title":"Default Title","offer_id":53723875770708,"sku":"46228110","price":1564.88,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0988\/3274\/4788\/files\/main-square_3a1e59b6-e087-4a89-9e23-6557959eeb97.jpg?v=1778053003"},{"product_id":"mastervolt-alternateur-alpha-compact-28-110-alpha-pro-iii-24v","title":"Alpha Compact 28\/110 Alternator with Alpha Pro III","description":"\u003cp\u003e\n    The \u003cstrong\u003eMastervolt Alpha Compact 28\/110\u003c\/strong\u003e alternator (part number 46628110) is a 24 V DC charging system designed for marine, mobile, and industrial applications requiring continuous power supply. It is supplied as standard with the external Alpha Pro III charge regulator, forming a complete solution compatible with the MasterBus network. This equipment enables rapid charging of service battery banks while powering onboard electrical consumers.\n\u003c\/p\u003e\n\n\u003ch3\u003ePositioning and comparison\u003c\/h3\u003e\n\u003cp\u003e\n    Unlike original alternators installed by engine manufacturers, which are often limited at low RPM, the Alpha Compact 28\/110 is specifically wound to deliver high charging current even at idle. Compared to the standard Mastervolt Alpha range, this Compact series features an automotive-style design that reduces volume by 25% and weight by 40%, while cutting fuel consumption by up to 30% thanks to improved efficiency. Within its own range, this standard model differs from the \"VP\" (Volvo Penta) version by the absence of an included pulley. This design choice allows the installation of a multi-groove free-wheel pulley with a diameter matching the target installation’s speed ratio.\n\u003c\/p\u003e\n\n\u003ch3\u003eElectrical and thermal specifications\u003c\/h3\u003e\n\u003cp\u003e\n    This alternator delivers a nominal current of 110 A at 6,000 RPM and 25 °C. Its charging capacity at idle reaches approximately 41 A at 1,800 RPM. The startup speed is set at 1,400 RPM, with a maximum tolerated speed of 15,000 RPM. It requires a power take-off (PTO) of 6.2 kW (8.3 hp). The unit is designed to operate in confined engine rooms, with a maximum operating temperature of 120 °C. Cooling is provided by an open design featuring a dual internal fan and a patented magnetic circuit that optimizes thermal dissipation.\n\u003c\/p\u003e\n\n\u003ch3\u003eAlpha Pro III Regulation and MasterBus Compatibility\u003c\/h3\u003e\n\u003cp\u003e\n    The alternator is controlled by the included Alpha Pro III regulator (firmware 4.0 or higher). This device uses a three-stage charging cycle (Bulk, Absorption, Float) that compensates for voltage drops and adjusts current based on real-time needs. The system supports all battery chemistries: flooded lead-acid, GEL, AGM, and Lithium-Ion. Native integration with the MasterBus protocol allows configuration of charging parameters, real-time monitoring, event history, and system alarm settings for the power production setup.\n\u003c\/p\u003e\n\n\u003ch3\u003eMechanical Design and Connectivity\u003c\/h3\u003e\n\u003cp\u003e\n    Weighing 7.4 kg, the alternator has a clockwise rotation direction and is mounted via a swivel arm, simplifying installation as a secondary alternator on original PTO mounts. The electronic components and wiring are protected against oil, moisture, and dust. The chassis is uninsulated by default; galvanic isolation requires optional rings. Connection interfaces include two M8 studs for the positive output, an insulated Fast-on terminal for the W signal (tachometer), a Mastervolt-specific port for excitation current, and an RJ12 port for connecting the alternator’s integrated temperature sensor.\n\u003c\/p\u003e","brand":"Mastervolt","offers":[{"title":"Default Title","offer_id":53723875934548,"sku":"46628110","price":1802.34,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0988\/3274\/4788\/files\/main-square_6f763b2e-db7b-4a65-b2f8-929446d36744.jpg?v=1778053176"},{"product_id":"mastervolt-alternateur-alpha-compact-28-110-vp-24v-110a","title":"Alpha Compact 28\/110 VP Alternator","description":"\u003cp\u003eThe Mastervolt Alpha Compact 28\/110 VP alternator is a high-performance charging solution designed specifically for demanding marine environments. Operating on a 24V system, it delivers a nominal current of 110 A with an impressive output of 6.2 kW (8.3 HP). Engineered to fit perfectly on Volvo Penta engines via its gimbal arm mounting, this alternator ensures rapid and efficient charging of your battery bank, starting from a generation speed of 1400 RPM and up to a maximum rotation speed of 15000 RPM. Note that this model is supplied without the Alpha Pro III charge regulator, which remains necessary for optimal voltage management.\u003c\/p\u003e\n\u003ch3\u003eThermal design and compactness\u003c\/h3\u003e\n\u003cp\u003eUnlike the classic Alpha series alternators, which are heavier and bulkier, the Alpha Compact range features a patented magnetic design that maintains compact dimensions while withstanding high temperatures. Weighing 7.4 kg, this model includes a dual cooling fan system, allowing it to operate safely up to a maximum temperature of 120 °C. This advanced thermal management ensures continuous energy production, even in the most confined and poorly ventilated engine compartments.\u003c\/p\u003e\n\u003ch3\u003eConnectivity and system integration\u003c\/h3\u003e\n\u003cp\u003eThe electrical installation of the Alpha Compact 28\/110 VP alternator is simplified by robust connections compliant with marine standards. It features two M8 positive output terminals, a W-signal connection via insulated lug, and a dedicated Mastervolt socket for induced current. Temperature monitoring is ensured by an integrated sensor with an RJ12 connector, enabling seamless communication with the electrical network once paired with the appropriate regulator. Although it is not galvanically isolated and rotates clockwise, its mechanical design makes it an ideal upgrade for propulsion systems requiring high charging capacity.\u003c\/p\u003e","brand":"Mastervolt","offers":[{"title":"Default Title","offer_id":53723876098388,"sku":"46228112","price":1613.36,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0988\/3274\/4788\/files\/main-square_6d912181-5d71-4677-8dcb-1e4cd0c03afe.jpg?v=1778053033"},{"product_id":"mastervolt-alternateur-alpha-compact-28-150-regulateur-alpha-pro-iii","title":"Alpha Compact 28\/150 alternator, Alpha Pro III regulator included","description":"\u003cp\u003e\n    The \u003cstrong\u003eMastervolt Alpha Compact 28\/150\u003c\/strong\u003e alternator (part number 46628150) is a high-capacity 24 V charging system designed for marine and industrial electrical installations. Supplied without a pulley, this model uses a specific magnetic design that reduces its volume by 25 % and its weight by 40 % compared to conventional alternators. It is provided with the external \u003cstrong\u003eAlpha Pro III\u003c\/strong\u003e charge regulator to ensure precise control of the charging cycle for all types of battery banks.\n\u003c\/p\u003e\n\n\u003ch3\u003eElectromechanical and thermal performance\u003c\/h3\u003e\n\u003cp\u003e\n    This model delivers a nominal current of 150 A at 6000 rpm (at 25 °C) and guarantees a production of 28 A at idle engine speed of 1800 rpm. The starting rotation speed is set at 1700 rpm, with a maximum tolerance of 16000 rpm. The mechanical power required on the power take-off (PTO) is 8.4 kW (11.4 hp). Cooled by a double internal fan within an open structure, the alternator supports an operating temperature of up to 120 °C. An integrated temperature probe with RJ12 connection ensures active thermal regulation. The electrical connections include two M8 positive output terminals, an isolated W-signal connection for the tachometer, and a proprietary Mastervolt connector for the excitation current. The net weight of the alternator is 7.9 kg, with a total packaged weight of 11.4 kg.\n\u003c\/p\u003e\n\n\u003ch3\u003eAlpha Pro III regulation and MasterBus integration\u003c\/h3\u003e\n\u003cp\u003e\n    The \u003cstrong\u003eAlpha Pro III\u003c\/strong\u003e regulator controls the output voltage via a three-stage charging algorithm (Bulk, Absorption, Float). This device compensates for temperature and optimizes charging for lead-acid, Gel, AGM, and lithium-ion batteries. The absorption phase is automatically timed (approximately 30 minutes for lithium-ion technology) before switching to float voltage. This regulator natively integrates the MasterBus communication protocol, enabling configuration of voltage thresholds, real-time charge data monitoring, and alarm management directly from the onboard network.\n\u003c\/p\u003e\n\n\u003ch3\u003ePositioning within the range and comparison\u003c\/h3\u003e\n\u003cp\u003e\n    Within the \u003cstrong\u003eMastervolt\u003c\/strong\u003e catalog, the Alpha Compact series stands out from the standard Alpha range with an optimized power-to-size ratio and an estimated 30 % reduction in fuel consumption. Compared to competing equipment such as the 24 V Balmar XT series, the \u003cstrong\u003eMastervolt Alpha Compact 28\/150\u003c\/strong\u003e offers the advantage of direct software integration thanks to the regulator's native MasterBus network, eliminating the need for additional data conversion gateways. Its lightweight design is specifically intended for cramped engine compartments requiring high continuous charging power, where a traditional 150 A alternator would be too heavy or bulky.\n\u003c\/p\u003e","brand":"Mastervolt","offers":[{"title":"Default Title","offer_id":53723876294996,"sku":"46628150","price":2119.82,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0988\/3274\/4788\/files\/main-square_a3d5ed0c-6966-44f4-b8cd-0a0e7bb3e810.jpg?v=1778053194"},{"product_id":"mastervolt-alternateur-alpha-compact-28-150-sans-poulie","title":"Alpha Compact 28\/150 alternator (without pulley)","description":"\u003cp\u003eMastervolt’s Alpha Compact 28\/150 alternator is a high-performance charging solution designed for vessels equipped with large-capacity 24V battery banks. With a 150-amp output current, this model ensures fast and optimal recharging, even at low engine speeds.\u003c\/p\u003e\n\n\u003ch3\u003eCompact design and power-to-weight ratio\u003c\/h3\u003e\n\u003cp\u003eDistinct from the standard Alpha series due to its reduced footprint, the Alpha Compact range was developed to fit in tight engine compartments. Weighing just 7.9 kg, this 28\/150 model delivers exceptional power density. Its internal architecture promotes efficient thermal cooling, allowing it to sustain high continuous charging currents without overheating the generator.\u003c\/p\u003e\n\n\u003ch3\u003eSystem integration and compatibility\u003c\/h3\u003e\n\u003cp\u003eThis specific model ships without a pulley, providing the technical flexibility to install a custom pulley, such as a multi-groove (serpentine) belt, perfectly aligned with your engine’s mechanical configuration. To fully utilize its capabilities and ensure battery safety (especially for Lithium-Ion banks), this alternator must be paired with an external charge regulator such as the Mastervolt Alpha Pro, which guarantees a 3-stage smart charging cycle and rigorous thermal protection of the system.\u003c\/p\u003e","brand":"Mastervolt","offers":[{"title":"Default Title","offer_id":53723876458836,"sku":"46228150","price":1851.69,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0988\/3274\/4788\/files\/alternateur-alpha-compact-28150-sans-poulie_46228150-1.jpg?v=1776349492"},{"product_id":"mastervolt-alternateur-alpha-compact-28-150-volvo-penta-24v","title":"Alpha Compact 28\/150 Volvo Penta alternator","description":"\u003ch3\u003eOverview of the Alpha Compact 28\/150 alternator for Volvo Penta\u003c\/h3\u003e\n\u003cp\u003e\n    The Mastervolt Alpha Compact 28\/150 alternator (part number 46228152) is designed for continuous power generation in marine and industrial environments. This 24 VDC model is specifically sized for direct mounting on Volvo Penta engines in the D4 to D13 series. It can be used as a primary replacement alternator or as a secondary power take-off (PTO) alternator dedicated to charging a service battery bank. This unit is supplied without the Alpha Pro III charge regulator, which is a mandatory component for managing output voltage and current.\n\u003c\/p\u003e\n\n\u003ch3\u003eTechnical performance and raw data\u003c\/h3\u003e\n\u003cp\u003e\n    The alternator delivers a nominal charge current of 150 A at 6,000 rpm (at 25 °C). Its excitation speed is set at 1,700 rpm, allowing it to provide a current of 28 to 30 A at an alternator rotation speed of 1,800 rpm (corresponding to engine idle speed). The maximum tolerated rotation speed is 16,000 rpm. The absorbed mechanical power (PTO) is 8.4 kW (11.4 hp), with a mechanical-to-electrical conversion efficiency of approximately 50 %. The maximum operating temperature reaches 120 °C, monitored by an integrated temperature probe with an RJ12 connection.\n\u003c\/p\u003e\n\n\u003ch3\u003eMechanical design and integration\u003c\/h3\u003e\n\u003cp\u003e\n    The Alpha Compact 28\/150 weighs 7.9 kg. Its internal architecture reduces weight by 40 % and volume by 25 % compared to conventional alternators of the same capacity. Cooling is provided by two internal fans, requiring installation with a clockwise rotation direction (viewed from the pulley side). This specific model includes a multi-groove belt pulley suitable for Volvo Penta blocks as standard and is mounted via a pivoting arm. The unit is non-insulated (the negative output is connected to the metal housing). For installations requiring galvanic isolation, an optional insulating bushing kit (part number 48420240) is available, changing the mounting hole diameter from M10 to M8 or from M12 to M10. Electrical connections are made via two M8 studs for the positive output, an insulated fast-on connector for the W signal (tachometer), and a proprietary Mastervolt connector for the excitation current.\n\u003c\/p\u003e\n\n\u003ch3\u003ePositioning in the Mastervolt range and comparison\u003c\/h3\u003e\n\u003cp\u003e\n    Within the Navico Group offering, the Alpha Compact series stands out from standard Alpha alternators (such as the Alpha 24\/110 or Alpha 24\/150 IV models) due to its compact format, the use of unidirectional internal fans instead of an external bidirectional fan, and a non-insulated base design. Unlike universal Alpha Compact versions, which are supplied without a pulley, this VP variant is ready for use with Volvo Penta engines. Combined with the Alpha Pro III regulator (sold separately), this system differs from original equipment alternators by applying a 3-stage charging algorithm compatible with lead-acid and lithium-ion battery banks, while offering full integration with the MasterBus communication protocol.","brand":"Mastervolt","offers":[{"title":"Default Title","offer_id":53723876655444,"sku":"46228152","price":1851.69,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0988\/3274\/4788\/files\/main-square_0e514e82-3d7a-4d9c-83d3-24612f7e21fe.jpg?v=1778053068"},{"product_id":"mastervolt-alphacompact-14-120-kit-mb-n62-alternateur","title":"Mastervolt AlphaCompact 14\/120 MB N62 mounting kit","description":"\u003cp\u003e\n    Designed for demanding onboard charging systems, the \u003cstrong\u003eMastervolt ALPHACOMPACT 14-120 MB N62 mounting kit\u003c\/strong\u003e is a high-performance alternator optimized for continuous power output. Specifically tailored for Mercedes-Benz N62 engines, this 12V DC alternator delivers a nominal current of 120 A at 6000 rpm (at 25°C), with a charging capacity of 70 A from 1800 rpm. Its engagement speed is 1300 rpm and it supports a maximum rotation speed of 20 000 rpm, providing a power output of 3.4 kW (4.5 hp).\n\u003c\/p\u003e\n\n\u003ch3\u003eDesign and Performance\u003c\/h3\u003e\n\u003cp\u003e\n    The \u003cstrong\u003eALPHACOMPACT 14-120\u003c\/strong\u003e alternator integrates an Alpha Pro III charge regulator as standard, providing an out-of-the-box solution for efficient battery management. Its patented design, featuring an open structure and dual internal fans, makes it up to 40% lighter and 25% more compact than conventional alternators. It is designed to operate in high-temperature environments up to 120 °C, with protection for cables and electronic components against oil, moisture, and dirt. Its rotation is clockwise and it features non-insulated galvanic isolation, though insulation is possible with optional rings (not compatible with N62).\n\u003c\/p\u003e\n\n\u003ch3\u003eIntegration and Compatibility\u003c\/h3\u003e\n\u003cp\u003e\n    Weighing 6.7 kg, this alternator is equipped with a swivel arm for mounting. Connections include a positive output stud (2x M8), an isolated fast-response W (rpm) signal connection, and a Mastervolt field current connection. A temperature sensor is integrated with an RJ12 connection. The \u003cstrong\u003eMastervolt ALPHACOMPACT 14-120\u003c\/strong\u003e is compatible with all battery types, including Lithium-Ion batteries, and contributes to up to 30% fuel consumption reduction. It is used in marine, mobile, infrastructure, and industrial sectors worldwide.\n\u003c\/p\u003e","brand":"Mastervolt","offers":[{"title":"Default Title","offer_id":56137113829716,"sku":"46214123","price":3062.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0988\/3274\/4788\/files\/family-SUPALT12V-46214123-1.png?v=1781650773"},{"product_id":"blue-sea-systems-alternator-mode-interrupteur-electricite-marine","title":"BLUE SEA SYSTEMS ALTERNATOR MODE switch","description":"\u003cp\u003e\n    Designed to protect marine electrical systems, the Blue Sea Systems \u003cstrong\u003eAlternator Mode\u003c\/strong\u003e switch incorporates an essential alternator field disconnect (AFD) function. This feature is critical to prevent damage to the alternator diodes if the battery switch is toggled to OFF while the engine is running, ensuring the longevity of your equipment.\n\u003c\/p\u003e\n\n\u003ch3\u003eProtection and Versatility\u003c\/h3\u003e\n\u003cp\u003e\n    These switches are available in 3- or 4-position selector configurations, offering flexibility for managing battery banks. The \"Make-Before-Break\" contact design allows switching between battery banks without interrupting power supply, ensuring continuous service for essential boat systems. With a maximum voltage of 32V DC, they are suitable for a wide range of marine installations.\n\u003c\/p\u003e\n\n\u003ch3\u003eRobust Design and Marine Safety\u003c\/h3\u003e\n\u003cp\u003e\n    Constructed from non-corrosive marine-grade metals and molded in durable reinforced polycarbonate, Blue Sea Systems Alternator Mode switches are designed to withstand demanding marine environments. They are \"Ignition Protected\", making them safe for installation on gasoline-powered boats, meeting ISO 8846 and SAE J1171 standards. The versatile mounting options allow for surface or rear-panel installation. The tinned copper terminals ensure maximum conductivity and corrosion resistance, with a one-piece terminal stud design resistant to loosening. Compliance with standards such as ABYC E-11, CE Marked, UL Listed (UL1107, UL 1500), ISO 8846, and IP66 protection (dust-tight and protected against heavy seas and water jets) confirms their reliability at sea.\n\u003c\/p\u003e","brand":"Blue Sea Systems","offers":[{"title":"Default Title","offer_id":56141669826900,"sku":"7775B-BSS","price":653.42,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0988\/3274\/4788\/files\/web-blue-sea-systems-blue-sea-systems-alternator-mode-interrupteur_7775B-BSS-01.jpg?v=1781696267"},{"product_id":"blue-sea-systems-pince-alternateur-7776b-bss","title":"BLUE SEA SYSTEMS ALTERNATOR CLAMP","description":"\u003cp\u003e\n    The \u003cb\u003eBlue Sea Systems ALTERNATOR CLAMP\u003c\/b\u003e is an electrical component from Blue Sea Systems, a brand known for its expertise in marine power management systems. Classified under \"Power Conversion\" and the \"Battery Chargers\" family, this item is designed to integrate into embedded electrical installations related to battery charging systems.\n\u003c\/p\u003e\n\u003ch3\u003eIntegration and Design\u003c\/h3\u003e\n\u003cp\u003e\n    Manufactured in Mexico, this item carries the reference \u003cb\u003e7776B-BSS\u003c\/b\u003e and is identified as a main product (\"Main Product\"). Its origin and harmonized code (4911.99.8000) are documented. The positioning of this product in the \"Battery Chargers\" family indicates its application within alternator charging systems, without specifying its exact operational function or performance specifications (voltage, current, dimensions, weight).\n\u003c\/p\u003e\n\u003ch3\u003eGeneral Information\u003c\/h3\u003e\n\u003cp\u003e\n    The Blue Sea Systems ALTERNATOR CLAMP (7776B-BSS) is a new item in the Navico catalog, with a stable price since its last update. It is delivered as a single unit, with no indication of specific weight, length, height, or width for the unit or master pack in the provided data.\n\u003c\/p\u003e","brand":"Blue Sea Systems","offers":[{"title":"Default Title","offer_id":56141680640340,"sku":"7776B-BSS","price":321.24,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0988\/3274\/4788\/files\/family-7775B-BSS-7776B-BSS-1.jpg?v=1781696294"},{"product_id":"mastervolt-alternateur-alpha-24v-150a-evo","title":"Alpha 24 V 150 A EVO Alternator","description":"\u003cp\u003eThe \u003cstrong\u003eMastervolt Alpha 24 V 150 A EVO alternator\u003c\/strong\u003e is a marine electrical power generation solution designed for 24 V systems requiring rapid charging of service and starter batteries. Its Alpha design is engineered to deliver usable current even at low engine speeds, where standard alternators often require higher RPM to reach their rated capacity.\u003c\/p\u003e\n\n\u003ch3\u003eHigh-power 24 V charging\u003c\/h3\u003e\n\u003cp\u003eThis model provides a total charge current of 150 A at 24 V. Manufacturer data indicates an absorption voltage of 28.5 V and a float voltage of 26.5 V. The alternator is isolated from ground, designed for a 2xA belt and fitted with an 89 mm nominal pulley.\u003c\/p\u003e\n\n\u003ch3\u003eEngine integration and marine use\u003c\/h3\u003e\n\u003cp\u003eThe Alpha range is designed to operate in engine rooms and maintain power output above 40 °C thanks to forced cooling via a fan. Mounting options allow adaptation to dedicated engine mounts or custom brackets depending on the installation. Paired with a Battery Mate or battery isolator, the alternator can contribute to charging multiple battery banks.\u003c\/p\u003e\n\n\u003ch3\u003eDo not confuse with the included regulator kit\u003c\/h3\u003e\n\u003cp\u003eSKU \u003cstrong\u003e48224152\u003c\/strong\u003e refers to the Alpha 24\/150 EVO alternator alone. It must not be presented as the kit with the Alpha Pro III regulator included, which corresponds to a different reference. For a complete installation, verify the regulator, engine mounts, pulley\/belt, and wiring suitable for the boat.\u003c\/p\u003e","brand":"Mastervolt","offers":[{"title":"Default Title","offer_id":56214012723540,"sku":"48224152","price":2034.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0988\/3274\/4788\/files\/main_7d782fd0-b7dd-4d45-9415-f76f944f973d.jpg?v=1782281213"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0988\/3274\/4788\/collections\/075f300539221ae64422e1131d4b6a18.png?v=1779975248","url":"https:\/\/skysat.fr\/en-us\/collections\/alternator.oembed","provider":"Skysat","version":"1.0","type":"link"}