20 Most Recent CyberPower CPS1200AVR (CYPCPS1200AVR) UPS System Questions & Answers

replace batteries

The power overload warning should only come on if you have too much of a load plugged into the UPS. You may be close enough to the edge of the limit so the disturbance from a surge can be enough to trip the overload detector.

Your UPS is rated for 1200 Volt-Amps, so it can drive a maximum of 10 Amps at 120 Volts. Every piece of equipment should have a label with the maximum Amps or Watts on it. Add up the Amps used by the equipment plugged into the UPS/AVR sockets to make sure the total is less than 10 Amps. If the equipment label rates power requirement in Watts, divide that number by 120 Volts to get the amperage. One thing to read carefully is the label on the computer power supply. It is commonly rated in output watts, but that is not the number to use for this calculation. Since it is not 100% efficient, you need to look for the input Amps number.

If you are too close to the limit, move the printer or monitor to a surge-only outlet or consider replacing the monitor with a more energy-efficient unit. If your load total is less than 9.5 Amps, the UPS may have a defect in the power overload detection or internal voltage regulation circuits.

Please discard. Probably a short circuit in the inverter!

It may not be dead yet. Does it supply output? You have not mentioned. It would be considered dead if it does not give any output. Is the battery fine? If the battery is fine and there is no output then it may be dead.
So, check the battery for any sign of life.
Check the output.
Check output with it plugged into mains.
If all are negative then it is dead.

just unplug the UPS and check for how long it runs on batteries, if time is short just replace the batteries. if you are using a line interactive UPS you may have to replace it by an online UPS

Your not asking the right question. The answer is dependent upon how long you want the backup to work. Does a battery fit in the unit or is it alone? If you were to connect a car battery to the unit it would run for many hours, say a motorcycle battery would run maybe an hour. It is all about the time you want for run time.

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What is the UPS displaying prior to shutting down? How old is the UPS? Did you change the batteries? Need as much info as you can give to help you.