Mastervolt BI 702-S 70A 12V 24V heavy duty battery isolator

The Mastervolt (83007021) BI 702-S battery isolator is based on conventional diode technology. The isolating diode is suitable for use in conventional systems with an alternator and a battery charger and 2 or 3 battery circuits. The falling diode voltage (approx. 0.6 V) can be compensated by adjusting the output voltage of the connected charger or generator. Mastervolt battery chargers and Alpha Pro MB alternator regulators are equipped with automatic voltage drop compensation as standard.

Mastervolt separator diodes are used to distribute charging current between multiple battery packs of the same nominal voltage. The use of an isolation diode ensures that the battery packs do not discharge each other. Mastervolt isolation diodes are only suitable for mounting between the positive output of a current exciter (charger or alternator) and the positive connection of the battery sets. The negative output of the current exciter and the negative terminals of the battery sets must be connected directly to each other. Isolation diodes cannot be used in a combined charger/converter system.

important product features

• has an integrated compensating diode
• max. current at output battery charger 25A / 50A
• Max. current at the alternator output 70A
• 2 battery outputs
• for 12V or 24V batteries
• very compact, in an absolutely solid body that avoids wear and tear

compact and light
The Mastervolt BI battery isolators are compact and made from an absolutely solid body, which avoids wear and tear. They weigh between 580 and 1300 grams.

sturdy and durable
Totally corrosion resistant material with aluminum heatsink. The electronic components are encased in plastic, diode splitters in the case of the BI models.

quick installation
Composite end plates with terminal spade lugs and solid screw terminals with nuts and locking rings to ensure a secure installation.

application areas

The battery cut-off relay should always be installed when two separate vehicle electrical systems are available or are being created. This is the case, for example, in the following cases:

• mobile homes
• Caravan with its own battery for autonomous operation
• Military vehicles (e.g. radio vehicles)
• truck
• coaches
• Cars with heavy additional consumers (e.g. powerful hi-fi amplifiers)
• smaller motor yachts without an on-board generator
• rescue vehicles