![]() disconnect when voltage gets to 12.8 VDC). parallel at 13.3 VDC) but isolated when discharging (i.e. 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. I contacted Battery Mart before purchasing and they told me it was a 1/4" stud but that did not seem right so I waited until I got it before I made up the cables.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. Oh and another thing, the included package and paperwork will not tell you this, but the battery terminal studs on the isolator are M8 studs so you need a 5/16" connector on the end of the cables. You have to come up with your own solution to prevent accidental contact with high current battery terminals once you install it. The only thing I don't like is how the battery terminals on the isolator are not covered. The ability to manually connect the auxiliary battery to the starting battery by the simple push of a button for a self contained jump start is another awesome feature. It does draw a very very small amount of power when the vehicle is off, so if you leave your vehicle sitting for long periods of time, putting a switch on the ground wire will allow you to switch off the source to ground which will turn off the isolator and stop it from draining the start battery. This simply connects to the batteries and gets grounded to the frame or chassis. I like that this battery isolator does not need to be wired into an ignition switched circuit in order for it to operate. Current Draw: Charging 500 mA (Standby 300 mA).Mounting: Surface / Fire Wall / Battery Side. ![]() Charging Current: 125 Amp, 150 Amp Peak.Automatically charges the auxiliary battery.Over current and surge protected for vehicles with electronic systems. ![]()
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