Meet the Mastervolt BI702-S BI Series Battery Isolator, a compact, solid-state solution designed to manage two batteries with minimal energy loss. Perfect for 12V and 24V marine and automotive systems, it ensures your charge current is shared efficiently while keeping each battery capable of powering its own bank.
The BI702-S includes a practical Charge Mate for connecting and/or disconnecting two batteries, plus Battery Watch for monitoring battery health—even usable as a main switch when needed. Built to support onboard systems with two or more batteries that operate independently, this isolator guarantees reliable, independent charging for each bank.
Key advantages include:
-
Two battery outlets to manage separate battery banks with ease
-
Diode-based technology that minimizes energy loss during charging
- Diode voltage drop (~0.6 V) can be compensated by adjusting the connected charger or alternator output
- Fully solid-state, compact construction that reduces wear over time
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Corrosion-proof material with aluminium heat sinks for durability in harsh environments
- Synthetic end plates with connection lugs and solid bolt connections with nuts and locking rings for straightforward installation
- Designed for two-battery systems powering 12V or 24V consumers with independent charging
Specifications
- 2
- 6.2 x 5.5 x 3.1 inches
- 1.3 lb
- 50 A
- 70 A
- Yes
Upgrade your dual-battery system with the BI702-S and enjoy reliable, efficient charging for both battery banks—whether you’re boating, cruising, or on the road. Mastervolt’s BI battery isolator delivers durable performance, easy installation, and smart battery management in one compact package.
| General specifications |
| Number of battery outlets |
2 |
| Dimensions, hxwxd |
6.2 x 5.5 x 3.1 inch |
| Weight |
1.3 lb |
| Technical specifications |
| Max. output battery charger |
50 A |
| Max. output alternator |
70 A |
| Compensation diode |
Yes |
