Quote:
Originally Posted by steffen707
I stumbled upon this site that contradicts some of your voltage numbers.
Deep Cycle Battery FAQ
They seem to say that zero is 10.5volts, 30% left is 11.75, 80% is 12.42.
I don't know what is right |
It's hard to say exactly, because it depends on the load you're putting on the battery.
You could take a battery resting at, say 11.75v (30% state of charge, says that page) and immediately drop it to 10.5 (empty) by connecting a big enough load to it - something like engaging the starter motor. (Below 10.5v, you risk cell reversal - permanent damage).
I must have taken my full-to-empty figures from some other chart that took a heavier load into account.
A better way for me to do this would have been to monitor voltage
under load, right down to 10.5. Then I would have known my total "range" under those particular conditions / usage.