BI702 S Load Distributor

The BI702 S integrates a compensation diode, unlike the standard BI702. This diode automatically compensates for the ~0.7 V voltage drop inherent to diode-based technology. Using the sense terminal, the output voltage of the charger or alternator is automatically adjusted to ensure optimal battery charging. The standard BI702 requires manual adjustment of the source voltage to compensate for this loss.

The Mastervolt BI702 S charge distributor can handle a maximum input current of 70 A from an alternator and 50 A from a battery charger. It is designed to distribute this current to two independent battery banks.

Yes, the BI702 S battery distributor can be used with any compatible battery charger or alternator, provided the charging source is suitable for use with a diode distributor. However, to benefit from the automatic voltage drop compensation function, the source must be equipped with a sensing terminal (sense). Mastervolt Mass chargers and Alpha Pro regulators include this feature.

Yes, the BI702 S is designed to be used with an alternator. It can support up to 70 A in alternator output. For automatic compensation of voltage drop, the alternator must be equipped with a sense terminal (borne de détection) to be connected to the S terminal of the splitter. Consult your alternator’s manual to verify this compatibility.

No, the Mastervolt BI702 S battery distributor is not designed to be used with a charger/inverter combi (combi). It is intended solely for installation between a charging source (alternator or dedicated charger) and the batteries. For combi systems, other solutions such as the Charge Mate are recommended.

The BI702 S has two battery outputs, allowing you to charge two independent battery banks. Each output can power one or more batteries connected in parallel, provided you respect the device's maximum current capacity (70 A total).

To install the BI702 S, first ensure the charging source is powered off. Mount the distributor in a well-ventilated area, preferably on a flat metal surface with the cooling fins oriented vertically. Connect the positive terminal of the charging source to terminal A (the longest one). Connect the positive terminals of the batteries to terminals 1 and 2. For S models, link the sense terminal of the source to terminal S (the thinnest one). Finally, connect the negative terminals of the source and batteries to a common ground point.

The BI702 S must be installed as close as possible to the charging source (alternator or charger) and the batteries. As it can heat up during operation (up to 120 °C), install it in a well-ventilated area. It is recommended to mount it on a flat metal surface to improve heat dissipation, with the cooling fins oriented vertically.

Use cables with a sufficient cross-section to handle the maximum current (70 A). Connections must be made via threaded screw terminals with nuts and locking washers. Ensure you use suitable crimp terminals and tighten the nuts firmly without over-torquing. Keep cable lengths as short as possible to minimize losses.

Yes, the BI702 S is designed to resist corrosion. It is built with a housing made from fully corrosion-resistant material and an aluminum heat sink. The electronic components are encapsulated in synthetic materials, making it suitable for demanding marine environments.

The Mastervolt BI702 S charge distributor measures 157 mm in height, 140 mm in width, and 80 mm in depth (6.2 x 5.5 x 3.1 inches). It weighs 0.58 kg (1.3 lb), making it compact and easy to integrate into tight spaces.

Yes, the BI702 S charge distributor is generally supplied with an installation and user manual. This manual details mounting steps, connection diagrams, and safety instructions. If you need an additional copy, you can download it from the Mastervolt website.

To benefit from automatic compensation, your alternator must be equipped with a sensing terminal (sense). Consult your alternator's manual to verify its presence. If your alternator does not have this terminal, you can still use the BI702 S, but you will need to manually increase the alternator's output voltage by approximately 0.7 V to compensate for the voltage drop.

For optimal cooling, it is strongly recommended to mount the BI702 S with the cooling fins oriented vertically. This allows for better air circulation and efficient heat dissipation. Avoid installing it upside down or in a position that would obstruct ventilation.

The typical voltage drop of the BI702 S is approximately 0.7 V, which is standard for diode splitters. Thanks to the integrated compensation diode (terminal S), this drop can be automatically compensated if the charging source is equipped with a sensing terminal.

Yes, the Mastervolt BI702 S load distributor is covered by the manufacturer’s warranty. The standard warranty is two years from the date of purchase, provided the installation complies with the manual’s instructions. Any non-compliant use or modification voids the warranty.

Some heating is normal during operation, especially at high currents (up to 120 °C). However, if the temperature seems excessive, check that the device is installed in a well-ventilated area with the fins vertical. Ensure that the connections are tight and that the cables have sufficient cross-section. If the issue persists, contact the after-sales service.