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Mastervolt

131902500

Solar charge regulator MPPT SCM25

The MPPT SCM25 Mastervolt solar charge controller is designed to optimize battery charging from 200 to 700 Wp solar panels. With an efficiency above 98%, it charges batteries up to 30% faster than a PWM controller. Compatible with automatic 12/24 V systems and all battery types (AGM, Gel, flooded, Lithium Ion), it comes with a temperature probe. Ideal for small to medium installations on sailboats and motorboats.

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£153.75 GBP

£153.75 GBP ~~£205.00 GBP~~

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Prices exclude import taxes (indicative rate: UK import VAT 20%). DAP delivery: import taxes are paid on delivery.

Available in stock

Free pickup point from €150 in France
Pickup at Skysat possible

Custom installation

Trust Skysat to install the equipment on board

Request a quote

Installers near you

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Support service

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Technical specifications

Product use	Solar charge regulation for 12/24 V batteries
Solar charge controller type	MPPT
Max charge current (A)	25
Nominal voltage	12/24
MPPT maximum power	720
Solar input voltage range	15-66
Absolute maximum solar voltage	75
PV startup voltage	15
Max efficiency	98
Supported battery chemistries	AGM,Gel,Flooded,Lithium Ion
Number of solar panel inputs	1.0
Supported load output	Oui
Number of charge stages	3.0
Temperature compensation	Oui
Wired network	MasterBus
Cooling method	Passive
Protection features	Overload,Short circuit,Overheating,Reverse polarity,Overvoltage,Undervoltage
Display type	Backlit LCD
Configuration software name	None (configuration via the controller's buttons and display)
Mounting type	Vertical on solid surface
IP rating	IP23
Operating temperature range	-20 to 55
Housing material	Black thermoset plastic rated UL 94V0
Weight	1.3
Dimensions (W x H x D)	135 x 190 x 75
Warranty	2.0
Ambient temperature range	0 to 55
Audible alarm	Yes
Battery temperature sensor included	Yes
Battery voltage auto-detect	Yes
Recommended cable cross-section	6
Certifications	CE, RoHS
Charge profile selection method	Power button (press >5s)
Required clearance around device (cm)	20
Cooling method	Passive (natural convection)
Information displayed on LCD screen	State of charge, charge current, battery voltage, alarms, battery settings
Operating humidity range	5-95
Max switchable output current	25
Max PV current (A)	18
Maximum PV voltage (V)	75
Maximum solar power (Wp)	720
Required mounting orientation	Vertical, downward-facing connectors
Maximum power point tracking efficiency	99.9
Night-time power consumption (mA)	5
Packaged weight kg	1.68
Detailed protections	Overload, Short circuit, Overheating, Reverse polarity, Overvoltage, Undervoltage, High/Low PV voltage, Transient overvoltage
PV startup voltage (V)	15
Nominal PV voltage range	15-66
Warranty years detail	2

Detailed description

The Mastervolt Solar ChargeMaster MPPT SCM25 solar charge regulator is the smallest MPPT regulator in its range, yet remains powerful. With a maximum charge current of 25 A and intelligent energy management, it is perfectly suited for small to medium solar installations, whether on a sailboat, motorboat, or recreational vehicle. Mastervolt’s MPPT (Maximum Power Point Tracking) technology delivers peak efficiency exceeding 98 %, ensuring battery charging up to 30 % faster than traditional PWM regulators.

MPPT technology and extended compatibility

Unlike its larger siblings in the range, such as the SCM50 or SCM60, the SCM25 is designed for solar panel power ratings between 200 and 700 Wp. It is compatible with a wide variety of panels, including entry-level 60-cell models, making it highly versatile. Its automatic 12/24 V detection simplifies installation. Mastervolt’s MPPT technology, with a maximum power point tracking accuracy of 99.9 %, continuously optimizes energy production, even in low light or changing light conditions.

Simplified installation and use

The SCM25 comes with a battery temperature sensor, essential for adjusting charge voltages and extending battery life. It is suitable for all battery types: AGM, gel, flooded, and Mastervolt Lithium Ion. Battery charge profiles are selected with a single button press, and the backlit LCD screen provides clear visibility of charge status, current, and alarms. Its IP23 protection rating guards against water splashes and condensation, but it must be installed in a dry, well-ventilated location.

Built-in protections and reliability

The SCM25 includes multiple protections: overcharge, short circuits, reverse polarity, overheating, and battery over/under-voltage. An audible alarm sounds in case of malfunction. While the SCM25 is a robust regulator, it is important to note that it does not protect against overvoltage on the solar input or induced overvoltages from storms. Installing a surge protector upstream is therefore strongly recommended for optimal system protection.

Documentation

Type	Nom
	FR - Fiche produit - régulateur solaire MPPT SCM25
	FR - Consignes de sécurité - régulateur solaire MPPT SCM25
	EN - Consignes de sécurité - régulateur solaire MPPT SCM25
	FR - Manuel utilisateur - régulateur solaire MPPT SCM25
	EN - Manuel d’utilisation et d’installation - régulateur solaire MPPT SCM25

Expert opinion

Pol CONIN

Digital Manager

« A reliable and simple MPPT controller, ideal for small installations »

The SCM25 is an entry-level MPPT charge controller well designed for small to medium-sized solar installations. Its compatibility with Mastervolt Lithium Ion batteries via an external DC relay (ref. 77030500) is a major asset for recreational boaters looking to modernize their battery bank. The IP23 housing is adequate for a dry technical space, but note: this controller is not protected against atmospheric surges. On a sailboat, adding a DC surge protector on the solar input is essential to prevent damage during a storm. The supplied temperature probe is a plus for battery longevity, but its lack of NMEA communication or connection to a centralized energy management system (such as MasterBus) limits it to a standalone controller role. It is an excellent choice for a simple and reliable installation, provided you strictly adhere to the recommended cable cross-sections (10 mm² for lengths exceeding 2 meters).

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Solar charge regulator MPPT SCM25

£153.75 GBP

£153.75 GBP ~~£205.00 GBP~~

Frequently Asked Questions

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What is the maximum charging current of the SCM25 charge controller?

The maximum charging current of the MPPT SCM25 Mastervolt solar charge controller is 25 A at a temperature of 40 °C. This value is essential for correctly sizing your solar installation and batteries.

What is the maximum power of solar panels I can use with the SCM25?

The SCM25 is designed for solar installations with a power output between 200 and 700 Wp. More specifically:

At 12 V: maximum power of 360 WpAt 24 V: maximum power of 720 WpThese values ensure optimal and safe operation of the charge controller.

Is the SCM25 compatible with 60-cell solar panels?

Yes, absolutely. The SCM25 MPPT controller is specifically designed to be compatible with low-end 60-cell solar panels, in addition to traditional 36- and 72-cell models. This makes it very versatile for different panel configurations.

What types of batteries can I use with the SCM25 charge controller?

The SCM25 is compatible with a wide range of batteries:

Wet AGM (flooded lead-acid)Gel (gel lead-acid)Lithium Ion MastervoltCharge profiles are pre-programmed for each type and can be easily selected via the power button.

Does the SCM25 automatically detect battery voltage (12 V or 24 V)?

Yes, the SCM25 regulator has a 12/24 V automatic detection function. It automatically adapts to your system voltage, simplifying installation and preventing manual configuration errors.

What is the maximum PV input voltage for the SCM25?

The maximum input PV voltage (at minimum temperature) is 75 V. Under nominal operation, the PV voltage must be between:

15 and 66 V for a 12 V installation
30 and 66 V for a 24 V installation
It is important to respect these limits to avoid damaging the charge controller.

Is the SCM25 supplied with a battery temperature sensor?

Yes, the SCM25 regulator comes with a battery temperature sensor. It automatically adjusts charging voltages based on battery temperature, optimizing charge and extending battery life.

What is the IP rating of the SCM25?

The SCM25 regulator has an IP23 protection rating. This means it is protected against finger contact and water splashes up to 60° from the vertical. It is suitable for indoor use in dry or humid environments, but not for outdoor exposure to rain.

Can I use the SCM25 with a Lithium Ion battery that is not Mastervolt branded?

The manual states that the SCM25 is compatible with Mastervolt Lithium Ion batteries. For a lithium battery from another brand, it is imperative to verify the compatibility of charge profiles and voltages. In case of doubt, consult the battery manufacturer or a qualified installer.

How to select the battery type on the SCM25?

To select the battery type, hold the Power button down for more than 5 seconds. The LCD screen will then display the different pre-programmed charging profiles (AGM, gel, flooded, Lithium Ion). Use the button to navigate and confirm your choice.

Does the SCM25 have an output to power consumers?

Yes, the SCM25 is equipped with a switchable "Load" output capable of supporting a maximum current of 25 A. This output can be used to power DC equipment, with built-in overload and short-circuit protection.

What are the dimensions and weight of the SCM25 regulator?

The SCM25 dimensions are 135 x 190 x 75 mm (height x width x depth). Its weight is approximately 1.3 kg. These compact dimensions make it easy to install in confined spaces, such as on a boat or in a motorhome.

What is the power consumption of the SCM25 at night or without sunlight?

The SCM25’s power draw when there is no solar production (at night) is extremely low, around 5 mA. This helps preserve the battery without discharging it unnecessarily. The controller automatically switches to sleep mode to reduce its power consumption.

Can I install the SCM25 in the same compartment as my batteries?

No, the SCM25 should not be installed in the same compartment as the batteries. Batteries can release explosive gases and corrosive vapors. It is recommended to install it in a separate, well-ventilated location, protected from water spray.

What is the operating temperature of the SCM25?

The SCM25 controller can operate within an ambient temperature range of -20 °C to 55 °C. Above 40 °C, power is automatically reduced to protect internal components. Cooling is passive (fanless), making it silent.

Is the SCM25 compatible with 200 W solar panels?

Yes, the SCM25 is perfectly suited for 200 Wp solar panels. The recommended power range is 200 to 700 Wp, which includes 200 Wp panels. At 12 V, the maximum power is 360 Wp, so a 200 Wp panel is within the limits.