Question: Battery Reserve Capacity
Noticed the reserve capacity for a particular RV battery was, I believe, 140 minutes at 25 amps. I assume the battery is discharged to 0 percent (11.9v) to get this rating? If it is 0 percent, is ...
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otrfun wrote:
Really appreciate everybody's input. I thought the reserve capacity would give me some idea of how many amp hours of current I could expect to get out of a given battery. Apparently that's not the case.
Interstate says their SRM-24 battery is capable of producing 5 amps for 17.1 hours or 15 amps for 4.9 hours. However, without knowing what voltage they're discharging to, it's hard to determine what this battery is really capable of.
Is there somekind of battery spec that I can use to get a very general idea (nothing exact) of how many amp hours of current I can expect to get out of a new battery (24, 27, or GC2) when it's discharged from 12.7 volts (100 percent) to 12.2 volt (50 percent)?
Thanks!
The 20 hr rate is just divide the AH by 20 to get the current, so a 100 AH battery means they used 5 amps for the draw down to 10.5v
A 232AH battery bank has a 20 hr (current) rate of 11.6 amps.
So if a battery will be down in 17 hrs at 5 amps that means it is less than 100AH at its 20 hr rate. However, that 5 is more than its 20 hr rate so Peukert happens that reduces the time to run the battery down even more--exponential not linear.
