That way I find the defective battery before putting it into service. Just before switching in a battery bank I do load test, similar to those used for testing car batteries, before switching the bank into service.
I stopped using those store bought UPS's in favor of a stand alone power inverter along with a smart charge control and two independant battery banks using deep cycle marine batteries.
VOLTAGE ON BATTERY BACKUP FOR SUMP PUMP GENERATOR
For Generac AVR GP3250 LP3250 3KW 4KW 4.5KW Generator Square Voltage Regulator. Measuring voltage when the UPS is in standby show 13+ volts but disconnecting them and then measuring each battery I usually find a bad one somewhere in the bank. LOW MAINTENANCE PICK: Superior Pump 92900 12V Battery Back Up Sump. For my test, I am using a 12v power supply (versus a battery) to power the unit (supplying a constant 12.089V - sump pump 12v battery voltage and 4.9V - sump.
The UPS I have is supposed to check the condition of the batteries every so often, and even that is not a guarantee the batteries are good. overflow Sump box includes an air vent to prevent air locks Rated voltage: 12V Automatic float. I've been burned several times when there is a power failure the UPS fails to supply the necessary load or only has enough reserve for a few seconds. Weve included a third type, battery backup sump pumps. If your sump pump is rated in amps, multiply that number times AC utility voltage, which is 120 in North America, to determine watts. Its been my experience using AGM batteries only last about 3-5 years installed in the typical UPS battery backup.
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