Storage configurations
| Number of Junction Boxes | Battery strings connected in parallel | Indicative maximum capacity |
|---|---|---|
| 1 | 2 | 500 kWh |
| 2 | 3 | 750 kWh |
| 3 | 4 | 1,000 kWh |
Capacities are rounded figures based on battery strings of approximately 250 kWh. The PowerKeeper ST250CF configuration has a nominal capacity of 249.6 kWh.
Technical specifications
| Parameter | Specification |
|---|---|
| Product designation | Battery Junction Box for SH50-80-125CX |
| Product code | A0ST7151 |
| Model specified in Sungrow documentation | SJC160-02 |
| Battery storage system | Sungrow PowerKeeper |
| Maximum DC voltage | 1,000 V |
| Rated current per input | 162.5 A |
| Rated output current | 200 A |
| Protection devices | Fuses and DC isolator |
| Ingress protection rating | IP66 |
| Corrosion resistance classification | C5 |
| Dimensions, W × H × D | 350 × 411 × 185 mm |
| Weight | ≤ 12 kg |
| Mounting | Wall-mounted |
The electrical and mechanical specifications refer to model SJC160-02, as listed in the Sungrow datasheet.
Applications and system sizing considerations
The Junction Box allows the storage system to be designed for future expansion, accommodating increased production loads or greater energy demand during periods without photovoltaic generation.
Increasing energy capacity in kWh does not automatically increase power output in kW. System sizing must take into account inverter limits, electrical connections and permitted configurations. Backup performance depends on the complete system configuration and the loads to be supplied.
