Mastervolt BI702-S BI Series Battery Isolator 70 Amp 2 Battery

The Mastervolt BI702-S BI Series Battery Isolator is a compact, solid-state device that quietly manages two battery banks with minimal energy loss in 12V and 24V marine and automotive systems. It ensures each bank can be charged independently while sharing the charger or alternator output efficiently.

• Two battery outlets: Manage two separate battery banks with ease in a single compact unit.
• System compatibility: Designed for 12V or 24V marine and automotive systems, with independent charging for each bank.
• Diode-based technology: Minimizes energy loss during charging while providing reliable isolation.
• Diode voltage drop compensation: Compensates the typical ~0.6 V drop; adjust the connected charger or alternator output to offset.
• Fully solid-state construction: Durable, maintenance-free performance in a small footprint.
• Corrosion-proof housing with aluminium heat sinks: Built to withstand harsh marine and automotive environments.
• Robust installation hardware: Synthetic end plates with connection lugs, solid bolt connections, nuts, and locking rings for easy setup.
• Charge Mate included: Simplifies connecting and disconnecting two batteries.
• Battery Watch included: Monitors battery health and can serve as a main switch when needed.
• Max output (charger): 50 A
• Max output (alternator): 70 A
• Dimensions: 6.2 x 5.5 x 3.1 inches
• Weight: 1.3 lb
• Compensation diode: Yes

Upgrade your dual-battery setup with reliable, efficient charging for two banks—each bank can power its own critical or auxiliary loads while sharing a common charging source. The diode-based design minimizes energy losses during charging, and the diode drop compensation allows you to offset that drop by adjusting your charger or alternator output. Built with corrosion-proof materials and aluminium heat sinks, it’s designed to withstand harsh marine and automotive environments. The included Charge Mate and Battery Watch simplify installation and ongoing battery management, and the unit’s independent charging for each bank offers flexible operation, with a compact footprint suitable for tight spaces.