Knowledge Base ›
Backup Switching Devices
Official manufacturer
GLOBAL
verified Sept. 20, 2026
Identity
| category |
backup_switching_devices
|
| device_type |
Backup box (emergency power supply transfer unit) for a residential hybrid inverter
|
| lifecycle |
Legacy - tied to the SH5K-20 generation
|
| manufacturer |
Sungrow
|
| model |
STB5K-20
|
| product_family |
Sungrow backup box
|
| product_name |
STB5K-20
|
| product_status |
active
|
| region |
GLOBAL
|
Electrical
| ac_voltage_range |
180 - 276 Vac
|
| max_eps_power_w |
5000
|
| max_output_current_a |
25
|
| nominal_ac_frequency |
50 Hz
|
| nominal_ac_voltage |
230 Vac
|
| phase_count |
1
|
| pole_count |
3
|
| power_consumption |
< 3 VA / 2 W
|
| rated_current_a |
20.0
|
| rated_voltage_v |
400.0
|
| switch_time_to_emergency_mode |
3 s
|
| switching_time_ms |
20.0
|
Physical / mechanical
| dimensions_w_h_d_mm |
220 x 230 x 90
|
| mounting |
Wall-mounting bracket
|
| weight_kg |
2.6
|
Installation
| role |
Supplies emergency loads (EPS) when the grid fails and the system runs off-grid
|
| topology |
Installed between the Sungrow meter and the hybrid inverter
|
| used_with |
SH5K-20 hybrid inverter
|
Environment
| humidity |
—
|
| max_altitude_m |
—
|
| operating_temperature_c |
-25 to 60
|
| operating_temperature_max_c |
60.0
|
| operating_temperature_min_c |
-25.0
|
Protection
| ip_rating |
UNKNOWN - the STB5K-20 technical data section does not state an IP rating
|
Additional documented parameters
Recorded verbatim from the source; no schema field exists for these yet.
| manufacturer_legal_entity_as_printed | Sungrow Power Supply Co., Ltd. |