Collection: Battery Management

Reliable power starts with a well-managed battery system.

Explore marine battery management solutions designed to help boaters monitor, charge, protect and control onboard battery systems. From everyday cruising to extended time on the water, dependable battery management helps keep essential equipment powered and ready when you need it.

Shop marine battery chargers, battery monitors, battery switches, isolators, relays, charge controllers, battery accessories and power-management components for maintaining and upgrading your vessel's electrical system.

Whether you're replacing an existing component, improving battery monitoring or building a more capable onboard power system, Roam & Harbor makes it easier to find dependable marine electrical equipment for your next project.

Manage your power. Protect your adventure.

243 products

  • Save $27.60 USD
    Victron Energy

    Victron VE.Bus BMS NG [BMS300200300]

    Regular price $156.40 USD
    Sale price $156.40 USD Regular price $184.00 USD

    VE.Bus BMS NGThe VE.Bus BMS NG is an all-in-one Battery Management System (BMS) for Victron Lithium NG batteries (not compatible with Lithium Battery Smart batteries), designed...

  • Save $15.00 USD
    Victron Energy

    Victron SmallBMS NG [BMS400100300]

    Regular price $85.00 USD
    Sale price $85.00 USD Regular price $100.00 USD

    SmallBMS NGThe SmallBMS NG is an all-in-one Battery Management System (BMS) designed for Victron Lithium NG batteries (not compatible with lithium smart batteries). It monitors and...

  • Commodore

    Commodore On/Off Battery Disconnect Switch [CM-202S]

    Regular price $29.99 USD
    Sale price $29.99 USD Regular price $0.00 USD

    On/Off Battery Disconnect SwitchThe Commodore On/Off Battery Disconnect Switch provides a reliable, durable, and safe solution for managing your marine or RV electrical systems. With a...

  • Save $6.45 USD
    Victron Energy

    Victron BCD 402 Combiner Diode - 2 Batteries - 40A BCD402 [BCD000402000]

    Regular price $36.55 USD
    Sale price $36.55 USD Regular price $43.00 USD

    BCD 402 Combiner Diode - 2 Batteries - 40A BCD402Diode Battery Combiners guarantee continuous DC power to mission-critical equipment, such as an electronic engine control system....

  • Save $24.30 USD
    Victron Energy

    Victron Smart BatteryProtect 48V - 100A [BPR110048000]

    Regular price $137.70 USD
    Sale price $137.70 USD Regular price $162.00 USD

    Smart BatteryProtect 48V - 100AThe Smart BatteryProtect disconnects the battery from non-essential loads before it is completely discharged (which would damage the battery) or before it...

  • Egis Mobile Electric

    Egis XD Series Single 500 Amp Heavy Duty Battery Switch/Mechanical Contactor [8710-1900]

    Regular price $50.20 USD
    Sale price $50.20 USD Regular price $0.00 USD

    XD Series Single 500 Amp Heavy Duty Battery Switch/Mechanical ContactorFeatures: Silver Alloy Contact Points support high ampere/full voltage switching capability versus legacy rotary style switches. Expandable:...

  • Save $50.70 USD
    Victron Energy

    Victron Filax 2 Transfer Switch 110V/50Hz-120V/60Hz [SDFI0000110]

    Regular price $287.30 USD
    Sale price $287.30 USD Regular price $338.00 USD

    Filax 2 Transfer Switch 110V/50Hz-120V/60HzFilax: the ultra-fast transfer switch. The Filax has been designed to switch sensitive loads, such as computers or modern entertainment equipment from...

  • Save $6.09 USD
    ARCO Marine

    ARCO Marine 500A/50mV Shunt [ST500]

    Regular price $31.45 USD
    Sale price $31.45 USD Regular price $37.54 USD

    500A/50mV ShuntShunt 500 Amp 50 mV - 500A/50mV

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