Battery under load
I've been looking for an answer to a specific question, on past discussions on other forums and I also have an open topic on another forum but it always gets into the weeds of what batteries and what ...
Forum Discussion
I would consider that voltage drop excessive for ~200Ah of 12v battery capacity and that load.
People tend to thing that 12.6+ voltage alone signals a fully charged and perhaps even healthy battery when voltage alone is not nearly so revealing.
I bet a hydrometer would reveal most of your cells are in the 1.225 to 1.255 range, when true full would be 1.275ish.
I'd have little faith in the carquest or the wally world marine batteries. Likely johnson controls made.
Try equalizing them, but you should have a hydrometer, and of course you need a way to get them upto 16 volts for as long as it takes for SG to max out or stop rising.
If you can't/wont EQ them, then they are basically never starting from 100% of their capacity, and will continue to degrade faster and faster each cycle and take longer and longer to recharge to their maximum remaining compromised capacity.
My Single 90AH AGM battery, with over 700 Deep cycles over 4 years would hold more voltage under that load, than you are reporting
People tend to thing that 12.6+ voltage alone signals a fully charged and perhaps even healthy battery when voltage alone is not nearly so revealing.
I bet a hydrometer would reveal most of your cells are in the 1.225 to 1.255 range, when true full would be 1.275ish.
I'd have little faith in the carquest or the wally world marine batteries. Likely johnson controls made.
Try equalizing them, but you should have a hydrometer, and of course you need a way to get them upto 16 volts for as long as it takes for SG to max out or stop rising.
If you can't/wont EQ them, then they are basically never starting from 100% of their capacity, and will continue to degrade faster and faster each cycle and take longer and longer to recharge to their maximum remaining compromised capacity.
My Single 90AH AGM battery, with over 700 Deep cycles over 4 years would hold more voltage under that load, than you are reporting
