Re: [Amel Yacht Owners] Wet Cell Batteries
"End of life" of lead acid batts is a good question. I would think that it is some relation to the banks ability meet your daily energy needs. Perhaps getting thru the night and still being at a 50% state of charge in the am would be one value? Or some other value based on personal comfort (i.e.are you close to marinas and services or are you heading fare off shore...). I think that with your solar capacity and generator, you can push your batteries close to that before replacing. You can estimate state of charge in the morning before the sun gets up by the bank voltage. You can corroborate this periodically with SG measurements.toggle quoted messageShow quoted text
I monitor my batteries pretty much daily now by checking the bank voltage at 6:30am (before getting solar input), and noting the current load and my overnight consumption (amp/hrs on the meter).
I think another good question is battery bank capacity. Our SM's were sizes up with 12 batteries when the extra freezer was added, and that was before solar. With significant solar charging throughout the day, do we really need 630 amp/hrs when you are using less than 10% overnight? So based on this you can afford to remove a pair or two of bad batteries before you would need to replace the rest of your bank.
Sorry for the delayed response. We are off sailing.
Best regards, Dan and Lori Carlson on sv BeBe, SM#387.