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Sterling Power Auxiliary Battery Charger / Maintainer

  • Output Amperage: 3 Amps, Output Voltage: 12 Volt DC, (1) Bank
  • Input Voltage: 12 Volt DC (Primary Battery)
  • Enables Auxiliary Battery Bank to be Kept Topped-Up by Main Battery Bank
  • Item #: 
    Sterling Power
    Model #: 


    Shipping Weight: 
    0.95 Lbs.
    List Price: 
    Our Price:
    Status:    null In Stock

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    Sterling Power Auxiliary Battery Charger / Maintainer


    • Enables another (auxiliary) battery bank to be kept "topped-up" from the main (primary) battery bank (which has one or more charging devices connected to it – alternator, battery charger, etc.)
    • Field-effect transistor (FET)-based device draws less than 1 mA while operating to maximize power generated from low-charge devices such as solar cells or wind turbines
    • FET devices have no contact and are free from wear and noise production – increases device's service life
    • Works by detecting when main battery bank reaches 13.3 Volt DC and allows the excess power to be transformed to auxiliary battery bank with only a minor voltage drop
    • Ideal for numerous marine and RV applications as well as solar / wind top-up (sharing surplus power from charged battery to other batteries)
    • LED indicators monitor primary and auxiliary battery bank charge status
    • Unit is IP65 waterproof
    • 2-year limited warranty


    • Sterling Power Model No. BM12123
    • DC Output Amperage: 3 Amps
    • DC Output Voltage: 12 Volt DC
    • DC Input Voltage: 12 Volt DC
    • Dimensions: 5.5" L x 1.77" W x 1.57" D

    For further details see Data Sheet for this product

    Note: Unit is a maintenance device, not a high charging device



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