![]() ![]() Battery combiners operate based on a specific voltage so the batteries are parallel when charging (i.e. Battery combiners will put two battery banks in parallel when there is charging voltage but leave the batteries isolated during discharge. connected together) automatically when there is a charging voltage and separately when there is no charging voltage. Let’s look at what they do and how they are different?īattery combiners, also called Automatic Charging Relays (ACRs) or Voltage Sensitive Relays (VSRs) are designed to put two battery banks in parallel (i.e. Battery combiners and battery isolators serve similar purposes but achieve sharing a charge differently. In this month's Tech Talk we are going to look at some charging scenarios using battery combiners and battery isolators to automate and simplify the charging process of multiple battery banks with only one charging source. ![]() However, many boats only have one charging source, such as an alternator or inverter/charger, so marine electrical designers are forced to share one charging source to recharge more then one battery bank. In an ideal electrical world, engine and house battery banks would always be separate and have their own charging source. Keep Charged - Charging Scenarios Using Battery Combiners and Battery IsolatorsĪ 12VDC marine electrical system typically relies on one battery to start the engine and another battery to power the “house” loads, such as refrigeration, lights or an inverter.
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