Calculating AH usage Based on SOC

pianotuna wrote:
Hi,

If you use a high draw appliance the "apparent" capacity of the battery bank becomes much lower.



So a 5 amp load on a 100 amp-hour bank drained to 0% state of charge will last for 20 hours--but a 10 amp load reduces total by 15% less.

You might get a "rule of thumb" for your own bank and camping style but it may be a rough guess.

Gjac wrote:

pianotuna wrote:
Gjac,

Look up peukert law.

If you want long battery life 50% is as deep as you want to go, so it is time to recharge.

The gas valve on the fridge may use more than 16 amp-hours per day. Mine uses about 29 amp-hours per day.

Don, wouldn't my simple calculation include the peukert effect? Am I missing something basic with this simple calculation?

What this is saying is you might if you don't exceed the C/20 rate; or 230/20 = 11.5 amps. But then these are ball park figures and change as battery temperature goes up or down. Check this site on SOC info:Solar Homestead or here Battery FAQ's