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CE Auto Electric Supply

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This my problem.

I have a boat that has 4 batteries on it. I have 3 yellow top optimas and a marine battery. The batteries are connected to a 4 position switch. The positions are off, batt 1 batt 2 , and all. I have the marine battery on position batt1. The have the optimas paralleled for batt2. All the voltages are 12v on all positions. Here is the problem. I bought a 4 bank charger to have the ability to charge each battery separately and condition each battery separately.What is the best way to separate the optima batteries so I can charge them separately? As mentioned , they are paralleled. I thought I can use three solenoids(that are normally closed) to break the circuit(bus)when i put them on a charger and have a relay to active then when the charger is hooked up. I was going to use a 120v to 12v power supply hooked to a relay to switch them. I really want to keep this cheap and easy to maintain. Is there anybody that can give me an idea on how to break the optimas from the bus so I can charge them effectively.
Edited by bignasty
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