Illustration shows the product category, not the exact model.
ST900U
A higher-rated standby option than the ST625U. Match both its watt and VA limits to the equipment you intend to connect.
- Continuous AC output
- 500 W
- Apparent power rating
- 900 VA
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Where it belongs in your plan
This model is rated for 900 VA and 500 W. Both limits matter. Neither number tells you how many watt-hours the battery can deliver; use the manufacturer’s runtime curve for the load you intend to connect.
Before you choose
Check the distinction between battery-backed and surge-only outlets.
Read the matching field guideA few useful answers
What should I check before buying the CyberPower ST900U?
Check the distinction between battery-backed and surge-only outlets.
Where do the ST900U specifications come from?
The specifications on this page are drawn from the manufacturer source linked below. Confirm the exact model and regional version in its current manual before ordering.
Has Outage Guide hands-on tested the ST900U?
Our guidance is based on published specifications. Where an independent reviewer has tested this exact model, we link to their findings so you can read the full account.