CyberPower ST900U 900VA / 500W Standby UPS
- VA
- 900
- Watts
- 500
- Form
- Tower
- Topology
- Standby
We source CyberPower UPS systems on demand for Canadian buyers. Our in-stock CyberPower catalogue currently covers replacement batteries for CP, PR, and OL series UPS units — if you need a specific CyberPower UPS model, our team can source it within 5-10 business days with a quote.
CyberPower is the value-focused challenger in the North American UPS market. Founded in Minnesota in 1997 and manufacturing globally since, the brand built its reputation on delivering APC-equivalent feature sets at 20–40% less cost per VA — pure sine wave output, automatic voltage regulation, LCD displays, and PowerPanel management software on models that competitors charge a premium for. CyberPower is the right fit for home offices, gaming PCs, SOHO deployments, and SMB server rooms that don't need APC's enterprise-depth ecosystem.
UPSPLUSBATTERY.CA stocks more than 175 CyberPower part numbers across every active family plus matching CyberPower replacement batteries. For broader comparison across brands, see our UPS systems collection.
CyberPower organises its catalog by model prefix. Each prefix signals topology and market tier. The table below maps every current CyberPower UPS family to the load it was built for.
| Family | Model prefix | VA range | Topology | Typical use |
|---|---|---|---|---|
| Standby (SE/EC) | SE, EC | 350 VA – 850 VA | Standby (offline) | Home PCs, modems, routers, consoles |
| AVR Series | CP, CP-AVR | 685 VA – 1500 VA | Line-interactive with AVR | Home office, gaming PCs, workstations |
| PFC Sinewave | CP, PR | 1000 VA – 1500 VA | Line-interactive, pure sine wave | Active-PFC power supplies, servers, NAS |
| Professional Rackmount / Tower (PR) | PR, OR | 1000 VA – 3000 VA | Line-interactive, sine wave | Network racks, small servers, AV installations |
| Smart App Sinewave (OL) | OL, OLS | 1000 VA – 10 kVA | Double-conversion online | VoIP, medical, industrial control, edge |
| Smart App Online S | OL-S, OL3S | 6 kVA – 20 kVA | Three-phase / modular online | Server rooms, light data centre |
For home and SOHO buyers, the shortlist is the CP-AVR or PFC Sinewave CP series (650–1500 VA, tower, pure sine wave on PFC models). For SMB server racks, PR or OR (1000–3000 VA, 2U rack/tower) covers standard deployments. For medical, VoIP, or any critical edge workload, step up to the OL series double-conversion online.
Every CyberPower UPS is rated in both volt-amps (VA) and watts (W). Standard SE/EC and CP-AVR series run a 0.6 power factor — a CP1500AVRLCD delivers 1500 VA but only 900 W. PFC Sinewave and PR models run higher PF (0.9 typical on PR1500LCD), and OL-series online models deliver unity PF on most current-generation SKUs. This matters for modern IT loads: an active-PFC power supply on a gaming PC or server can trip a 0.6-PF UPS that looks big enough on paper.
Add up nameplate wattage, multiply by 1.25 for a growth buffer, and match that number to the UPS's watt rating — not its VA rating. Our UPS sizing guide works through the method with examples.
Standby (SE/EC): The UPS passes utility power through and switches to battery when the line drops. Transfer time 6–10 ms. Acceptable for home desktops; not recommended for servers or any active-PFC power supply.
Line-interactive with AVR (CP, CP-AVR, PR): An automatic voltage regulator corrects brownouts and surges without touching the battery, extending battery life in regions with unstable grid voltage. Transfer time 2–4 ms. Pure sine wave on the PFC and PR series makes this the right topology for gaming PCs, NAS, and most SMB server loads.
Double-conversion online (OL): Load runs permanently from the inverter, so transfer time is zero and output voltage/frequency are fully regenerated. Required for medical equipment, VoIP PBX systems, precision lab gear. Read line-interactive vs online UPS for the full decision framework.
CyberPower ships in tower (CP, CP-AVR, OL tower variants), 1U/2U rackmount (PR, OR, OL rack variants), and rack/tower convertible (most PR and OL mid-range SKUs). Rail kits are included with all rackmount and convertible SKUs.
The eight SKUs below cover the bulk of Canadian home-office and SMB CyberPower deployments.
| Model | Power | Topology | Chassis | Outlets | Replacement battery |
|---|---|---|---|---|---|
| EC850LCD | 850 VA / 510 W | Standby | Tower | (12) NEMA 5-15R | RB1290X2A |
| CP1000AVRLCD | 1000 VA / 600 W | Line-interactive, AVR | Tower | (9) NEMA 5-15R | RB1290X2A |
| CP1500AVRLCD | 1500 VA / 900 W | Line-interactive, AVR | Tower | (12) NEMA 5-15R | RB1290X2 |
| CP1500PFCLCD | 1500 VA / 1000 W | Line-interactive, PFC sine wave | Tower | (10) NEMA 5-15R | RB1270X2A |
| PR1500LCD | 1500 VA / 1000 W | Line-interactive, sine wave | Tower | (8) NEMA 5-15R | RB1290X2A |
| OR1500LCDRM2U | 1500 VA / 900 W | Line-interactive, sine wave | 2U rack/tower | (8) NEMA 5-15R | RB1290X2 |
| PR3000LCDRTXL2U | 3000 VA / 2700 W | Line-interactive, sine wave | 2U rack/tower | (8) NEMA 5-15/20R, (1) L5-30R | RB1290X4A |
| OL3000RTXL2U | 3000 VA / 2700 W | Double-conversion online | 2U rack/tower | (8) NEMA 5-15/20R | RB1270X8 |
All models above ship with PowerPanel management software. OR, PR, and OL units include an SNMP card slot (RMCARD205 or RMCARD305); the SNMP card is an add-on accessory on standard SKUs and pre-installed on -NET variants.
CyberPower uses the RB (Replacement Battery) naming convention: RB followed by voltage (12 for 12 V) and capacity codes. Every CP, PR, OR, and OL ships with the RB cartridge number printed on the unit label and listed in the user manual. Common cartridges include RB1290X2A (fits CP1500AVRLCD, EC850LCD, PR1500LCD), RB1270X2A (fits CP1500PFCLCD), and RB1290X4A (fits PR3000LCDRTXL2U).
CyberPower RB cartridges ship pre-assembled with the correct connector and voltage stack. Compatible third-party cartridges cost less but should be matched carefully on voltage, amp-hours, and connector — see our CyberPower replacement batteries collection for the full matrix.
Every CyberPower UPS sold by UPSPLUSBATTERY.CA ships from a Canadian warehouse with full manufacturer warranty — three years on electronics and batteries for CP, CP-AVR, PR, and OR series, plus CyberPower's $500,000 Connected Equipment Guarantee that reimburses damage to protected equipment caused by UPS failure. OL-series online models carry a three-year standard warranty with extended coverage available.
Every CyberPower tower and most rackmount units up to 1500 VA plug into standard NEMA 5-15 receptacles. Units at 2000 VA and above use L5-20P or L5-30P inputs and may require a dedicated circuit. OL-series 3 kVA and above may require hard-wire input on some variants — check the spec sheet before ordering.
For home, SOHO, and entry-level SMB use, CyberPower delivers equivalent power protection at 20–40% less cost per VA. APC's advantages — PowerChute's native integration with VMware and Hyper-V, deeper SNMP ecosystem, and replacement-battery availability 15+ years after a model is discontinued — matter for enterprise rack deployments where those specific features justify the premium. For home offices, gaming PCs, and small server rooms, CyberPower is the smarter buy. Compare directly: our CyberPower UPS collection alongside the APC UPS catalog.
AVR (CP-AVR series) delivers line-interactive protection with simulated sine wave output — fine for legacy PC power supplies but will cause issues with modern active-PFC supplies that reject non-sine wave input. PFC Sinewave models (CP1500PFCLCD and the PR series) output pure sine wave, making them safe for active-PFC loads including current-generation PCs, servers, NAS, and gaming rigs. Pay the upgrade if you're protecting anything newer than a 2015 PC.
Yes — CyberPower is one of the most popular UPS brands in the gaming community specifically because of the PR1500LCD and CP1500PFCLCD pure-sine-wave units. The 900–1000 W watt rating handles a typical gaming rig (CPU, GPU, monitor, peripherals) with comfortable headroom. Pure sine wave output is essential for active-PFC gaming power supplies.
Add up the nameplate wattage of every device, multiply by 1.25 for a growth buffer, and pick a UPS whose watt rating exceeds that number. A gaming PC at 600 W plus a monitor at 40 W equals 640 W × 1.25 = 800 W — a PR1500LCD (1000 W) gives real headroom. Our UPS sizing guide walks through the full method.
CyberPower rates its sealed lead-acid batteries for three to five years of useful life in a climate-controlled environment (20–25 °C). High ambient temperature shortens life — every 8 °C above 25 °C roughly halves battery life. PowerPanel and the front-panel LCD flag the battery as "replace" once internal impedance crosses the threshold.
Yes. Every current CyberPower model uses a user-replaceable battery cartridge accessed through a front or bottom panel. Always use the CyberPower RB part number listed on the unit label, and reset the battery install date via PowerPanel after the swap.
Yes. Every CyberPower UPS sold by UPSPLUSBATTERY.CA carries the full manufacturer warranty valid in Canada — three years electronics and battery on CP/PR/OR, three years on OL, plus the $500,000 Connected Equipment Guarantee. Warranty is serviced by our Canadian team in coordination with CyberPower's North American support, so RMA turnaround does not require cross-border shipping.
Our Canadian team has specified APC, Eaton, Tripp Lite, Vertiv, Mitsubishi, Toshiba, CyberPower, XPC, and Delta UPS for healthcare, data centres, and government. Enquiries answered in business hours.