Maximize charging efficiency on two-bank systems with the Mastervolt BI 1202-S Battery Isolator 120A 2-Bank (83012021) from Nomadic Supply Company®. Built for high-output alternators up to 120 amps, this single-stud input isolator separates your starter battery from your house bank while ensuring both receive a full charge from the alternator. The compact design and solid-state reliability make it the ideal choice for commercial trucks, yachts, and large RV systems.
Mastervolt BI 1202-S Battery Isolator 120A 2-Bank (83012021) Features:
- 120A Continuous Rating. Supports high-output alternators up to 120 amps for commercial and large-vehicle applications.
- Single-Stud Input (S-Series). Simplified single alternator input connection reduces installation complexity.
- 2-Bank Isolation. Permanently prevents discharge between starter and house banks for reliable engine starting.
- Solid-State Reliability. No relays, no moving parts — delivers thousands of hours of maintenance-free operation.
- 12V / 24V Compatible. Works with both 12-volt and 24-volt marine and vehicle electrical systems.
- Thermally Rated Enclosure. Anodized aluminum housing handles thermal load from sustained 120A operation.
Mastervolt BI 1202-S Battery Isolator 120A 2-Bank (83012021) Specifications:
- Max Charging Current: 120A
- Number of Banks: 2
- System Voltage: 12V / 24V
- Voltage Drop: 0.6–0.7V (diode)
- Weight: 2.65 lbs (1.2 kg)
- SKU / MPN: 83012021
