My 12V Desulfator does not start to work until the voltage reaches 12.95 volts instead of 12.5volts, is it faulty?
Operation-wise, there’s hardly any difference between 12.95 or 12.50 or 13.50V. The key point here is that the desulfator works when “the engine is on” and turns itself before the battery gets discharged. The electronics that make up the desulfator are analogue based, and there will be a slight tolerance between units. In this case, it’s less than 4%. It’s not a failure or defect, and will work fine. So they are not faulty.
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