Overload
CyberPower UPS
Severity:What Does This Error Mean?
The Overload alarm on a CyberPower UPS means the total watt draw of all connected devices exceeds the UPS rated output capacity. The UPS will alarm loudly and may shut off output to protect itself from overheating. Unplug high-draw devices — especially laser printers, space heaters, or power-hungry monitors — until the alarm stops.
Affected Models
- CyberPower CP series
- CyberPower BR series
- CyberPower OL series
- CyberPower EC series
Common Causes
- Total connected load exceeds the UPS watt or VA rating
- A laser printer connected to the UPS — laser printers draw very high power during printing
- Multiple high-draw devices added over time without recalculating total load
- A device with a faulty power supply drawing excessive current
- UPS VA rating chosen too low for the actual equipment
How to Fix It
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Immediately unplug the highest-draw devices. Laser printers, large monitors, and external hard drive docks are common culprits.
Laser printers can draw 800–1,200 watts when the fuser heats up. They should always be plugged directly into the wall — never into a UPS.
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Add up the watt ratings of all connected devices and compare with the UPS watt capacity (shown on the front display or the product label). Keep the total below 70% of rated capacity.
A UPS rated at 1,000 VA typically delivers around 600 watts. Running at more than 70–80% load reduces battery runtime and stresses the UPS.
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If the load is within limits but the alarm still fires, reconnect devices one at a time to identify a device with a faulty power supply drawing excessive current.
A power supply failure can cause a device to draw far more current than its nameplate suggests. Isolating the cause protects both the UPS and other connected devices.
Frequently Asked Questions
Will a CyberPower UPS shut off automatically during overload?
Yes — CyberPower UPS units will cut output after sounding the overload alarm if the condition is not resolved. This protects the UPS inverter from damage. The unit will restart automatically once the overload is removed and the reset button is pressed (on some models).