Handle high-output charging for complex multi-bank systems with the Mastervolt BI 1203 Battery Isolator 120A 3-Bank (83012031) from Nomadic Supply Company®. Rated for 120 amps continuous, this isolator is ideal for large alternators on commercial vessels, heavy-duty trucks, and full-size coach RVs. It simultaneously charges three independent battery banks while the diode architecture ensures complete isolation, preventing any bank from discharging into another.
Mastervolt BI 1203 Battery Isolator 120A 3-Bank (83012031) Features:
- 120A Heavy-Duty Rating. Handles large alternator output up to 120 amps, suitable for commercial and heavy-duty applications.
- 3-Bank Simultaneous Charging. Charges three independent battery banks at the same time from a single alternator.
- Complete Isolation Between Banks. Diode design guarantees zero current flows between battery banks, protecting starter and house banks.
- Rugged Aluminum Construction. Heavy-duty heat-sink housing efficiently manages thermal load at sustained high current.
- 12V / 24V System Compatibility. Works with both 12-volt and 24-volt electrical systems.
- Low-Profile Mounting Design. Compact form factor fits in engine compartments, wiring centers, and electrical panels.
Mastervolt BI 1203 Battery Isolator 120A 3-Bank (83012031) Specifications:
- Max Charging Current: 120A
- Number of Banks: 3
- System Voltage: 12V / 24V
- Voltage Drop: 0.6–0.7V (diode)
- Weight: 2.65 lbs (1.2 kg)
- SKU / MPN: 83012031
