Join Date: Feb 2010
Location: Narragansett Bay
Thanked 560 Times in 537 Posts
Rep Power: 11
Re: Island Packet 35
I would thumbnail 11.9 volts at 30% state of charge. Gels can take this better than any other, but it still hurts a bit.
If they're seven years old, you're due for replacement very soon anyway. If they're getting you through the day, just work on understanding the charging systems and prepare for a fresh new bank.
You want to read up on 3 stage charging profiles (bulk, absorb and float) and it's mandatory to have a shunt that can read amps going into your battery. Most basic monitors just measure what's being used or being generated by charge sources. However, as I said, what's actually going into your battery is usually very different.
All the best with your refit.
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In the harsh marine environment, something is always in need of repair. Margaritas fix everything.