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Old 10-08-2013
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Re: Batteries don't stay charged

Maybe off topic for the OP's post but while we're all here, Mainesail, maybe you can give me a tiny piece of advice.

I have 280w of solar array working through a charge controller and it all appears to work pretty well. But . . . .

I topped all my batteries up (6 x Trojan T105) about three weeks ago and when I went aboard last weekend, I checked the batteries again and they were all dry (water below the plate tops).

What is puzzling is that my batteries were at a 13.2v state of charge (SoC) when I left the boat 3 weeks ago and everything was turned off. Incoming charge was about 7 amps, reduced due to high SoC. The solar array and a wind gen (also on a charge controller) are wired through the 1-2-All switch which was left in All position. Wind gen was switched off because I didn't believe it needed to be running.

Is this a sign that the batteries are reaching the end of life? They are about 7 years old. Even with a low water level, the battery monitor still showed about 13.5 volts. I topped the batteries up again and then ran everything (fridge, lights, radios) for the whole weekend with no problem, SoC still right up there.

Your advice would be of value.
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