Tartan 27' owner
Join Date: Jan 2008
Thanked 110 Times in 102 Posts
Rep Power: 8
Re: Battery Switch
Seven years of use would be about an average life expectancy of a lead/acid battery. Some people get much longer use (10+ yrs).
I'm not sure about AGM's life expectancy.
The OFF-1-BOTH-2 switch could be misleading. Folks tend to talk about a "house" bank and a "starting" bank. I think, in your case with 7 group 24 batteries you should think of your bank with the largest number of batteries as the "house" bank and the smaller of the two as the "starting" bank.
Use the house bank for cabin lights etc and the starting bank will get your engine started in the morning.
What size alternator does your engine spin to charge those 7 batteries? Perhaps you need more recharging capacity or just run the engine more if the alternator has the amps to recharge your banks. Solar, wind and/or shore power?
Your bank 2 with 11.8V is too low and likely needs replacement. Can you start your engine using just this bank as the power source?
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