Compact and durable battery isolator for charging and protecting two or three onboard batteries.

Keep your batteries charged and protected with the MasterVolt BI 702-S Battery Isolator. This compact and durable isolator is designed for conventional systems with an alternator or battery charger and two or three batteries.

The diode technology ensures a minimal energy loss, and the solid state construction prevents wear. Its corrosion-proof material and fast installation make it a reliable choice for any boat or RV.


  • Diode technology for minimal energy loss
  • Solid state construction for durability
  • Corrosion-proof material for longevity
  • Fast and easy installation
  • Suitable for conventional systems with alternator or battery charger and two or three batteries


Number of battery outlets 2
Dimensions (hxwxd) 157 x 140 x 80 mm (6.2 x 5.5 x 3.1 inches)
Weight 0.58 kg (1.3 lb)
Max. output battery charger 50 A
Max. output alternator 70 A
Compensation diode Yes
SKU MV83007021
Barcode # 83007021
Brand Mastervolt

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