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Mastervolt BI 1203-S

Mastervolt BI 1203-S

Mastervolt BI 1203-S

  • Mastervolt BI 1203-S
  • Mastervolt BI 1203-S
  • Mastervolt BI 1203-S
  • Mastervolt BI 1203-S

Mastervolt BI 1203-S

Product description Mastervolt BI 1203-S

Onboard systems usually consist of two or more batteries that function independently when powering the 12, 24 or 48 V consumers. These batteries require independent charging with reliable battery isolators or battery combiners.


- Battery isolators that divide your charge current with a minimum energy loss.
- The Charge Mate for connecting and/or disconnecting two batteries.
- Battery Watch for monitoring the condition of your batteries (also usable as main switch).

Mastervolt’s BI battery isolators are based on conventional diode technology. The diode voltage drop (ca. 0.6 V) can be compensated for by adapting the output voltage of the connected charger or alternator. Mastervolt battery chargers and Alpha Pro MB charge regulators come as standard with automatic voltage drop compensation.

Compact and lightweight:
- The Mastervolt BI battery isolators are compact and fully solid state, preventing wear. The weight varies from 580 to 1300 grams.

Robust and durable:
- Completely corrosion-proof material with aluminium heat sinks. The electronic components are encased in synthetic materials, the BI models have molded diode splitters.

Fast installation:
- The synthetic end plates feature connection lugs, the solid bolt connections with nuts and locking rings ensure easy installation.


- Number of battery outlets: 3
- Dimensions, hxwxd: 207x140x80 mm 8.1 x 5.5 x 3.1 inch
- Weight: 1.3 kg, 2.9 lb

Technical specifications:
- Max. output battery charger: 80 A
- Max. output alternator: 120 A
- Compensation diode: yes

Buy now your Mastervolt BI 1203-S for only 159.45 $. Made by Mastervolt, Mastervolt BI 1203-S is available in a range of sizes and colours, and comes complete with everything you´ll need. At waveinn, we offer the best price of your favourite nautical & fishing products. View our full range of Electric connection within our Electronics department.

Features Mastervolt BI 1203-S

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