Meet the Mastervolt BI703 BI Series Battery Isolator—the smart way to split charge current across multiple batteries with minimal energy loss. This 70 Amp isolator is designed for 3-battery configurations, ensuring reliable, independent charging for 12V or 24V systems.

• Three battery outlets provide separate charging paths for up to three batteries, keeping banks balanced and ready to power your on-board devices.
• Charge Mate for connecting and/or disconnecting two batteries, giving you simple control over battery configurations.
• Battery Watch to monitor battery condition and it can also function as a main switch when needed.
• Solid-state, compact design with corrosion-proof materials and aluminum heat sinks; built to withstand marine and on-board environments with no moving parts to wear.
• Easy installation with molded diode splitters, end plates with connection lugs, and solid bolt connections with nuts and locking rings.
• Charging capability Max output charger 50 A; Max output alternator 70 A for robust charging performance.
• Voltage drop handling The diode voltage drop (~0.6 V) can be compensated by adjusting the charger or alternator output, or by using Mastervolt Mass chargers or Alpha Pro regulators with automatic voltage drop compensation.
• Specifications Dimensions: 8.1 x 5.5 x 3.1 in; Weight: 2.4 (approx. 1.1 kg); Number of battery outlets: 3; Compensation diode: No.