fully reset the BMV back to factory settings to get rid of your synchronization and your zero current calibration, then go back through (make sure to read the manual on your settings) and re-enter your settings as appropriate. check your installation and make absolutely certain that there is nothing connected to your battery bank NEG other than the "battery" side of the shunt, and B. which means that it won't be counted against your SOC.īottom line: I recommend that you A. If there might be a phantom load on the system of, say, 1A and you performed a zero current calibration, you just told the BMV to ignore that. literally every other system NEG including your chassis ground must go to the "loads and chargers" side of the shunt.įurthermore, you should almost never do the "zero current calibration" because you've just told the BMV to ignore any current there might have been when you performed it. no other wires, no chassis grounds, nothing. I recommend that you go through and make sure that there is nothing connected to your battery bank NEG other than the "battery" side of the shunt. This is how you can get a high SOC reading with a low voltage. but if there's a load that doesn't run through the shunt, it won't be counted against your SOC. SOC isn't based on battery voltage, it's based on entered capacity +/- current through the shunt (with of course a lot of other calculations being taken into account, including Puekert exponent and charge efficiency) as such, SOC will only reflect your settings +/- the current measured. Secondarily, I strongly suspect that you have a load that's bypassing the shunt somewhere (ie, its ground does not run through the shunt). Where you have it currently set is well below the battery's resting voltage even, let alone its float voltage. as spec'd in the user manual, on a 12v nominal system the charged voltage should typically be set at 13.2v. Your BMV-712's "charged" voltage is set wayyyy too low.
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