![]() ![]() That means we can’t use electricity and then glance at the battery voltage and expect an accurate state of charge. but only after the battery has rested for 3 hours. The manufacturer provides us a battery’s voltage based on its state of charge. Remember, battery voltage levels are a moving target. The above image shows a battery consistently drawn to 80% depth of discharge has a lifespan of about 600 cycles, compared to 1,600 cycles when drawn to 25% DOD.Ī battery’s remaining capacity (state of charge) is theoretically shown by its voltage. (From documentation for the VMAX AGM batteries).ĭrawing your battery to a low depth of discharge drastically reduces it’s lifespan. Obviously, you want to know how close the battery is to being dead. If there’s anything you take from this post – you need to have a method to reliably check your battery’s remaining capacity (state of charge). ![]() If the battery gets drawn too low, it can severely reduce its lifespan. We recommend reading this in-depth article on improving a battery monitor’s accuracy: The expertise to program the battery monitor to adjust for these variables is why we pay for them! Of course, battery monitor manufacturers understand these issues. This is like your car trying to tell you miles-per-gallon without knowing how fast you were driving. Battery voltage is a moving target.īattery monitors also display usage statistics (Amp-hours consumed). Battery voltage can go up or down just because it got colder or hotter.
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