12/31/2023 0 Comments 24 volt car battery![]() ![]() I sent him a link to your chart and told him to call Magnum tech support to learn to tweak the meter. Just yesterday a customer called because his inverter shut down at 23 volts, a definite low battery but the SOC meter claimed he was at 81% full. The meters that you can get that take their info from the inverter or in the case of Midnite Solar from the charge controller are more accurate because they temperature compensate but they need fine-tuning as well. It doesnt help that the manual makes little sense to the layman or that the meter cant read battery voltage and often keeps compounding small errors into bigger ones. The standard meter for years has been the Tri-Metric meter but I finally gave up on using them because they arent very accurate unless fine-tuned beyond the level most homeowners are capable of understanding. The meters on the other hand can get way off. I dont call the voltage reading open circuit voltage, I call it “resting voltage” and if done right as you outlined it is seat of the pants but still somewhat accurate. The one thing I would disagree with somewhat from your well written article is concerning the accuracy of state of charge meters. I do off grid solar for a living, 25 years now and I sent a customer the link to this chart to give him an extra tool to keep tabs of his system. I just wanted to let you know good work on the chart and description. I guess my question is do I need to do this since the wally world batteries always seem to be in good shape as per hydrometer readings? ![]() I have combined them a few times, then manually started equalization. I combine the batteries whenever we lose power for more than a few hours so we can run TVs, fans DVD player and lights etc. It is set to equalize every 30 days, however sometimes I have to do it more than that, to bring them all back to green. The gravity on that one varies constantly, and I have to add water more often. That powers a flat screen TV, charges laptops etc. My other set up has about 750 watts of poly panels, run through a xantrex 30 amp charge controller charging a trojan 12 volt golf cart battery. In other words a heavier load for shorter periods. I mainly use this system for 12 volt water pumps,a few LED’s and cfl lights and occasionally power tools. The reason I ask is: I have 90 watts of harbor freight panels, run thru a sunsaver controller that charges 2 wally world deep cycle batteries and the gravity has almost never been below the green level, and I never really have had to add much water. If the gravity of each cell stays relatively the same (usually all in the green) does that mean that I don’t need to equalize that battery? ![]()
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