[ STANDBY / OFFLINE UPS // IDENTIFIED MODEL ]
CyberPower ST900U
CyberPower North American standby UPS: 900 VA / 500 W. Twelve NEMA 5-15R outlets on this North American model: six battery-backup + surge-protected and six surge-only. Confirm outlet labels and exact regional nameplate. This record is limited to the named model and regional variant; confirm the complete unit label and matching manufacturer documentation.
ARCHIVAL IDENTIFICATION: Record full SKU/suffix, input and output labels, serial/date code, hardware revision, battery part/age, condition, accessories and the manual revision used. Similar model names do not establish electrical equivalence.
Exact model specifications
| Manufacturer / catalog topology | CyberPower; standby (offline) UPS. The inverter normally remains out of the utility path and assumes the load after a transfer event; it is not line-interactive AVR or online double-conversion. |
|---|---|
| Capacity / regional input | 900 VA apparent-power limit / 500 W real-power limit; North American 120 V AC nominal input and 60 Hz service. Check the full nameplate for accepted input range and regional approval; VA and W limits both matter. |
| Output / waveform | 120 V AC nominal North American standby/offline design; simulated-sine-wave battery output. Verify frequency/transfer behavior from the nameplate and ST900U guide. Waveform and transfer tolerances are not inferred across revisions; match the manufacturer specification to the exact suffix. |
| Receptacles / load allocation | Twelve NEMA 5-15R outlets on this North American model: six battery-backup + surge-protected and six surge-only. Confirm outlet labels and exact regional nameplate. Keep critical equipment on the battery-backed group. Never exceed the individual receptacle, total VA or total watt limit; USB charging sockets, if any, are not AC outlets. |
| Battery / replacement / hot-swap | Internal sealed lead-acid battery. Use the ST900U-specific manual and approved service/recycling process; hot-swap is not assumed. |
| Runtime limits / test conditions | Check the ST900U load/runtime chart for the expected watts. Runtime varies with load and battery service life; the 500 W maximum does not imply a fixed backup time. Runtime tests should record load watts, battery age/health, charge state, room temperature and test date; do not extrapolate from an empty-unit self-test. |
| Interface / host compatibility | USB host-communication port supports PowerPanel Personal; two USB-A charging ports (2.1 A shared) are charging outputs, not a network-management interface. Host monitoring/shutdown requires compatible CyberPower PowerPanel Personal software; verify current OS support and the exact manual. No Ethernet or native network-management interface is specified. |
| Protection / scope | Surge protection and battery backup apply only to the receptacles and protection paths labeled for this model. The UPS does not correct an unsafe branch circuit, provide a ground where none exists, or guarantee protection from every transient. |
Safety, service & limits
- Use only on the voltage, frequency and grounded supply shown on the unit label; never defeat grounding, daisy-chain UPS outputs, or connect a generator/alternate source contrary to the matching manual.
- Do not connect laser printers, heaters, motors or other high-inrush loads unless the manufacturer explicitly permits them and the continuous and surge limits are satisfied.
- Do not open an energized enclosure or service an internal battery outside the manual’s procedure. Lead-acid batteries can deliver high fault current and may contain corrosive electrolyte; avoid short circuits and dispose/recycle under local rules.
- Remove damaged units from service if the case, cord, plug, grounding, receptacle, battery or indicators show heat, swelling, leakage, cracking, odor, corrosion or other faults. Follow the manufacturer warnings for shutdown and isolation.
- Battery backup is finite and is not a substitute for safe shutdown, a properly rated circuit, electrical code compliance, or manufacturer instructions. Re-check the outlet map, firmware/software support and nameplate before deployment.
Manufacturer sources and documentation
- CyberPower — CyberPower ST900U manufacturer product informationPrimary source for the exact model, nameplate capacity, configuration and downloadable model resources; confirm regional suffix.
- CyberPower PowerPanel Personal software and supported-host informationManufacturer documentation/support source. Select the manual or software information for the exact model and revision; this archive is not a substitute for the current instructions.