BATTERY ENERGY STORAGE SYSTEMS (BESS)
PowerKeeper ST050-250CF — modular C&I energy storage, 50–250 kWh
Country: China · Model: PowerKeeper ST050-250CF
The manufacturer floor-standing modular storage at 49.9–249.6 kWh with an SH125CX hybrid inverter for small commercial sites. It is built from STC12.5 LFP packs of 12.48 kWh each and expands to 1,000 kWh and 8 h of discharge. Off-grid transition takes ≤ 10 ms, so a shop or workshop keeps running through a grid fault.
- Battery pack
- STC12.5: 12.48 kWh, LFP, 32.4–43.8 V, ≤ 90 kg
- System capacity
- 49.9–249.6 kWh (ST050CF–ST250CF), expandable to 1,000 kWh and 8 h
- Off-grid transition
- ≤ 10 ms
- Protection rating
- IP66, C5, immersion at 50 cm for 24 h
Technical specifications
| Battery pack | STC12.5: 12.48 kWh, LFP, 32.4–43.8 V, ≤ 90 kg |
|---|---|
| System capacity | 49.9–249.6 kWh (ST050CF–ST250CF), expandable to 1,000 kWh and 8 h |
| Off-grid transition | ≤ 10 ms |
| Protection rating | IP66, C5, immersion at 50 cm for 24 h |
| Operating temperature | discharge −20 to +55 °C |
| Standards | IEC/EN 62619, IEC/EN 63056, UN 38.3, VDE 2510-50, UL 9540A |
| Customs codes (for reference) | |
| HS code | 8507.60 |
| UKTZED code (Ukraine) | 8507600000 |
| CN code (EU) | 85076000 |
Specifications are taken from the manufacturer’s technical documentation. Updated . Customs codes are for reference only; the final code is determined at customs declaration for the specific model.
Description
Each pack runs at 32.4–43.8 V and weighs up to 90 kg, so it is carried in and placed without lifting gear. New and second-life modules can share one system, with active balancing between them, so capacity can be bought as consumption grows. The SH125CX inverter couples the battery on the DC side, so PV energy reaches storage without an extra conversion. The IP66, C5 enclosure survives immersion at 50 cm for 24 h, so a low-lying or rain-soaked site is no problem. Discharge is rated for −20 to +55 °C. The ST050CF–ST250CF line complies with IEC/EN 62619, IEC/EN 63056, UN 38.3, VDE 2510-50 and UL 9540A.
How to choose
Size the capacity to the daily load profile of the site. The 12.48 kWh step per pack gives sizes from the ST050CF at 49.9 kWh to the ST250CF at 249.6 kWh, and expanding to 1,000 kWh stretches discharge to 8 h. If you need 257 or 514 kWh in one 125 kW cabinet right away, the liquid-cooled PowerStack 255CS is simpler. Megawatt-hour projects call for the PowerTitan 2.0 ST5015UX and PowerTitan 3.0 ST6900UX-4H containers.
Request a price and lead time
PowerKeeper ST050-250CF — modular C&I energy storage, 50–250 kWh. We reply within one business day.
Or email office@usk.ua or call +38 (044) 339-50-20.
FAQ
How far can PowerKeeper be expanded?
Up to 1,000 kWh and a discharge duration of 8 h.
Can new and old battery modules be mixed in PowerKeeper?
Yes, new and second-life packs can be combined, with active balancing.
Which inverter is used in the PowerKeeper ST050-250CF?
The SH125CX hybrid inverter, with off-grid transition in ≤ 10 ms.
How much does an STC12.5 pack weigh?
Up to 90 kg for 12.48 kWh at 32.4–43.8 V.
Can PowerKeeper survive flooding?
The IP66, C5 enclosure withstands immersion at 50 cm for 24 h.
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Need a price, lead time or replacement?
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