The Mastervolt BI1202-S BI Series Battery Isolator is a compact, fully solid-state solution that splits charging current for dual-battery setups on 12- or 24-volt systems. It keeps two battery banks charged independently while sharing the same charging source, and it includes integrated controls for easy management—ideal for boats, caravans, and other multi-battery systems that demand reliable, efficient charging.
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Number of battery outlets: 2 outlets for independent charging paths from a single source
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System compatibility: Suitable for 12- or 24-volt electrical systems
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High current capability: Max charger output up to 80 A; max alternator output up to 120 A
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Diode-based technology with voltage drop compensation: Compensation diode provides a 0.6 V drop to maximize charging efficiency, compatible with Mastervolt Mass chargers and Alpha Pro regulators
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Solid-state construction: Corrosion-proof housing with aluminum heat sinks and fully encapsulated electronics plus molded diode splitters for longevity
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Easy installation: End plates with connection lugs and bolt connections with nuts and locking rings simplify mounting
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Integrated management features: Charge Mate for connecting and/or disconnecting two batteries; Battery Watch for monitoring battery health (also usable as a main switch)
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Versatile applications: Built for boats, caravans, and any multi-battery system requiring reliable charging
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Physical dimensions: 8.1 x 5.5 x 3.1 inches; weight 2.6 kg
By delivering two independent charging paths from a single source, the BI1202-S helps ensure each battery bank stays properly charged while preventing cross-charge and simplifying system wiring. The solid-state design reduces energy loss and enhances reliability in demanding environments. Integrated features like Charge Mate and Battery Watch make battery management straightforward, whether you’re cruising, camping, or maintaining a multi-battery setup. For a robust, low-maintenance dual-battery isolator that delivers consistent charging, the Mastervolt BI1202-S stands out.
| General specifications |
| Number of battery outlets |
2 |
| Dimensions, hxwxd |
8.1 x 5.5 x 3.1 inch |
| Weight |
2.6 |
| Technical specifications |
| Max. output battery charger |
80 A |
| Max. output alternator |
120 A |
| Compensation diode |
Yes |
