Battery combining relays

Battery combining relays

Product VOLTAGE Capacity Sort page by dimensionsDimensions (LxWxH)
Cellpower Battery Separator 100A 12V/24V 100A 46x46x80mm (lxwxh)
Cellpower Battery Separator 140A 12V/24V 140A 46x46x80mm (lxwxh)
Cellpower Battery Separator 500A 12V/24V 500A 80x70x72mm (lxwxh)
Cellpower Battery Separator 160A IP65 12V/24V 160A / watertight 108x72x58mm (lxwxh)
Cellpower Battery Separator 500A IP65 12V/24V 500A / watertight 80x70x72mm (lxwxh)
Victron Cyrix 100A 12V/24V 100A 46x46x80mm (lxwxh)
  • Cellpower Battery Separator 100A

    Cellpower Battery Separator 100A

    • Cellpower
    • 12V/24V
    • 100A
    • 46x46x80mm (lxwxh)
    more info
  • Cellpower Battery Separator 140A

    Cellpower Battery Separator 140A

    • Cellpower
    • 12V/24V
    • 140A
    • 46x46x80mm (lxwxh)
    more info
  • Cellpower Battery Separator 500A

    Cellpower Battery Separator 500A

    • Cellpower
    • 12V/24V
    • 500A
    • 80x70x72mm (lxwxh)
    more info
  • Cellpower Battery Separator 160A IP65

    Cellpower Battery Separator 160A IP65

    • Cellpower
    • 12V/24V
    • 160A / watertight
    • 108x72x58mm (lxwxh)
    more info
  • Cellpower Battery Separator 500A  IP65

    Cellpower Battery Separator 500A IP65

    • Cellpower
    • 12V/24V
    • 500A / watertight
    • 80x70x72mm (lxwxh)
    more info
  •  Victron Cyrix 100A

    Victron Cyrix 100A

    • Victron
    • 12V/24V
    • 100A
    • 46x46x80mm (lxwxh)
    more info

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Why separate the starter battery from the secondary battery?

In each vehicle with a combustion engine there is a starter battery. If you have several batteries in a vehicle, to feed additional power consumers, it is necessary to properly distribute the charging current to the batteries. Obviously, the starter battery needs to be charged first, so the engine can always be started. Then, the secondary battery, or accessory battery, for example bow thruster battery, is recharged. Therefore, the batteries are separated by an isolating relay, also called battery separator.

The operation of a battery separator

The microprocessor controlled battery separator monitors the voltage of the starter battery. As long as the voltage of the starter battery is too low, thus not fully charged, the battery separator will direct the charge current to the starter battery only. When the starter battery has reached its maximum voltage for more than 7 seconds, the battery separator will also distribute charging current to the secondary or accessory battery. Accessories in, for example, a vehicle or vessel are powered by such a battery. When the engine of camper or boat is switched off, the voltage of the batteries drops over time. If this voltage is less than a certain value for over 60 seconds, the battery separator will separate the batteries again. This way the starter battery will remain charged.

Bipolar operation of the Cellpower Battery Separator

The Cellpower Battery Separators have a unique feature. If the accessory or secondary battery in your boat, camper or caravan, is charged with a battery charger, the Cellpower Battery Separator will also distribute current to the starter battery. This function is only activated provided that the secondary or accessory battery is fully charged. Once the charger is no longer connected to the accessory or secondary battery, the battery separator will disconnect the batteries again. Thus the Cellpower Battery Separator works bipolar, current can be directed in two directions.

Applications for Battery combining relays

  • Recreation
  • Boat
  • Caravan