We have been off grid now for over 2 years and up until a couple months ago all was well. My 8 sump pump (12v) batteries have been doing just fine, but during the last couple months the voltage by moring has dropped off to 12.5 with no load, and 12.4 or 12.3 with load. The load is nothing more than a light or two, and maybe a small TV, which normally would only drop the voltage down to 12.5 and remain there. This morning the voltage was 12.4 with nothing being on all night, going into panic mode now. I checked each battery specific gravity, all showing in the high zone, how can this be, with the voltage only showing 12.4? I charge the batteries the same every day, solar panels, and when the wood shop is running on the generator, it also runs the battery charger. In the 2 plus years I have only had to add water to a couple batteries, and that was only in the last 4 months. Should I panic, or is this voltage drop somewhat normal? All batteries are connected via + and - buss bars, all connections seem to be tight. Any help would be appreciated. Thanks, BEAR