Actual Battery Amp-Hour Availability

Question:

I have two flooded L/A batteries in parallel each rated by the manufacturer at 122Ah. Since full discharge of a flooded battery is 50%, does this mean I really only have 122 Ah usable with two batteries in the bank?  Thanks.  - Will from Michigan

Answer:

Hi Will, that’s correct, if you don’t want to prematurely wear down your batteries with deep discharges, you should NOT empty your flooded lead acid battery below 50% of capacity. Since you have two 122 amp-hour batteries in parallel for a total of 244 amp-hours, 50% of capacity is 122 amp-hours.  - Jeff