% Charged | Specific Gravity |
100% | 1.255 1.275 |
75% | 1.215 1.235 |
50% | 1.180 1.200 |
25% | 1.155 - 1.165 |
0% | 1.110-1.130 |
Comparison of Battery State-of-Chart to Open Circuit Voltage for 12-Volt Batteries | |||
% Charge | FLA | Gel | AGM |
100 | 12.70-12.60 | 12.95-12.85 | 12.90-12.80 |
75 | 12.40 | 12.65 | 12.60 |
50 | 12.20 | 12.35 | 12.30 |
25 | 12.00 | 12.00 | 12.00 |
0 | 11.80 | 11.80 | 11.80 |
Divide values in by 2 for 6v, mulitply by 2 for 24v, 4 for 48v |
For my future reference * or any other it may be useful for.
<chart>
Does this seem correct to everyone ( before anyone that does not know any better like me relies on it)
11.9V is usually considered "dead", like the text you posted 1 below it.
12.4V is usually considered 50%, which the text says, but that is a lot different than what the chart says.
I don't think I like that chart.
One the one hand, I agree with Chris, that being off grid makes it hard to rest a battery long enough to measure it, but on the other hand, when you have TWELVE parallel strings of 12V batteries in a 24V system, it would seem easier to rest a string or three than for folks running a single string of 12 ginormous 2V cells.
I can take a bank offline for work - but my greatest concern with 8-12 hours offline is that it's very hard to find a time where you could put the isolated bank BACK online and have it close to the same SOC as the rest of the bank.
/me makes a mental note. Prioritize that wind genny raise.