$155.99
The Tripp Lite AVR900U is the better UPS battery backup overall, rated 3.0 to 2.9. The Tripp Lite AVR900U leads on topology and waveform and features. The CyberPower ST900U wins on value. The CyberPower ST900U costs $36.04 less ($119.95 vs $155.99).
Prices were last checked November 9, 2026. Product prices and availability are accurate as of that date and are subject to change; the price and availability shown on Amazon or the retailer's site at the time of purchase apply. As an Amazon Associate we earn from qualifying purchases.
CyberPower ST900U
A standby UPS for a mid-range desktop PC when you do not need AVR or an LCD.
Amazon $119.95$119.95
Which should you buy?
- Choose the Tripp Lite AVR900U for topology and waveform (line-interactive, simulated sine wave vs standby, simulated sine wave) and features (automatic voltage regulation, software or network management vs USB charging, software or network management).
- Choose the CyberPower ST900U for value ($23.99 per 100 W ($119.95, 500 W) vs $32.50 per 100 W ($155.99, 480 W)).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every desktop (under 1,000 VA) UPS battery backup; a clear win is highlighted. How we rank explains each one.
| Factor weight | Tripp Lite AVR900U | CyberPower ST900U |
|---|---|---|
| Overall rating | 3.0/5 | 2.9/5 |
| Value 25% | 63 $32.50 per 100 W ($155.99, 480 W) | 77 $23.99 per 100 W ($119.95, 500 W) |
| Output 15% | 15 480 W rated output | 16 500 W rated output |
| Topology and waveform 20% | 30 line-interactive, simulated sine wave | 0 standby, simulated sine wave |
| Runtime 10% | 50 runtime at 100 W not published (neutral score used) | 50 runtime at 100 W not published (neutral score used) |
| Features 15% | 45 automatic voltage regulation, software or network management | 35 USB charging, software or network management |
| Warranty 15% | 44 3-year warranty, $100,000 equipment guarantee | 47 3-year warranty, $125,000 equipment guarantee |
Specifications
| Tripp Lite AVR900U | CyberPower ST900U | |
|---|---|---|
| Power | ||
| Rated apparent power | 900 VA | 900 VA |
| Rated real power | 480 W | 500 W |
| Topology | Line-interactive | Standby |
| Battery waveform | Simulated sine | Simulated sine |
| Automatic voltage regulation | Yes | No |
| Battery and runtime | ||
| User-replaceable battery | Yes | - |
| Outlets and features | ||
| Outlets | 12 (6 on battery) | 12 (6 on battery) |
| Format | Desktop | Desktop |
| Display | - | LED indicators |
| USB charging ports | No | Yes |
| Data port, software or network option | Yes | Yes |
| Warranty | ||
| Warranty | 3 years | 3 years |
| Connected-equipment guarantee | $100,000 | $125,000 |