Knowledge Base › Commercial Ess
Sungrow ST255CS-2H
Official manufacturer EU / global (IEC datasheet) verified Sept. 3, 2026
Identity
| category | commercial_ess |
| generation | PowerStack 255CS (successor to PowerStack 200CS) |
| hardware_revision | UNKNOWN |
| legacy_name | UNKNOWN |
| manufacturer | Sungrow |
| market_version | Datasheet V2 (2025) |
| model | ST255CS-2H |
| product_family | PowerStack 255CS |
| product_status | active |
| product_status_evidence | Launched April 2025 (Sungrow press release 'Sungrow Launches PowerStack 255CS'); live product page; datasheet V2 dated 2025 |
| region | EU / global (IEC datasheet) |
| release_year | 2025 |
| sku | UNKNOWN |
| subcategory | C&I liquid-cooled AC-coupled energy storage cabinet |
| variant_note | 2-hour duration variant. The 4-hour sibling is ST510CS-4H (separate record). |
Electrical
| ac_connection | 400 V, 3P4L |
| ac_voltage_range_v | 340 V ~ 440 V |
| architecture | AC-coupled ESS with integrated PCS |
| battery_rack_configuration | 256S1P |
| cell_chemistry | LFP |
| cell_spec | LFP 3.2 V / 314 Ah |
| cycle_life | UNKNOWN |
| dc_component_pct | <= 0.5 % ( Nominal power ) |
| expansion_rules | Parallel cabinets only; the cabinet itself is not module-expandable per the datasheet. |
| firmware_requirements | UNKNOWN |
| frequency_range_hz | 45 ~ 55 / 55 ~ 65 |
| grid_services | Grid-forming with black start capability (product page). Datasheet V2 prints reactive/PF range only. |
| max_charge_current_a | UNKNOWN |
| max_charge_power_kw | UNKNOWN |
| max_discharge_current_a | UNKNOWN |
| max_discharge_power_kw | UNKNOWN |
| max_parallel_quantity_off_grid | 10 |
| max_parallel_quantity_on_grid | 25 |
| max_parallel_stacks | 25 |
| max_thd_current_pct | <= 3 % ( Nominal power ) |
| mixed_generation_restrictions | UNKNOWN |
| modules_max | UNKNOWN |
| modules_min | UNKNOWN |
| nominal_energy_kwh | 257 |
| nominal_frequency_hz | 50 / 60 |
| nominal_voltage_note | NOT printed. Only 'Nominal Voltage Range 691.2 V ~ 934.4 V' is given. (256 x 3.2 = 819.2 V is arithmetically implied but not stated, so it is left UNKNOWN and recorded in raw_discovered.) |
| nominal_voltage_v | UNKNOWN |
| off_grid_frequency_hz | 50 / 60 |
| off_grid_max_thd_voltage_pct | 3 % ( Linear load ) |
| off_grid_nominal_voltage_v | 400 |
| off_grid_unbalance_load_capacity_pct | 100 |
| operating_voltage_max_v | 934.4 |
| operating_voltage_min_v | 691.2 |
| pcs_note | PCS is integrated in the cabinet; topology (transformerless / isolated) is not printed on datasheet V2. |
| pcs_topology | UNKNOWN |
| power_factor_range | 1.0 leading ~ 1.0 lagging |
| rated_ac_power_kw | 125 |
| rated_ac_voltage_v | 400 |
| rated_power_kw | 125 |
| round_trip_efficiency_pct | 90 |
| rte_note | Product page: 'System RTE 90%'; 'PCS efficiency over 98.5%'. Not printed on datasheet V2 itself. |
| scaling_architecture | Up to 25 cabinets in parallel on-grid; up to 10 off-grid. |
| supported_installation_topology | Outdoor, AC-coupled; optional 250 kVA transformer cabinet documented on the 200CS sibling for off-grid duty |
| system_energy_kwh | 257 |
| usable_dod_note | 'Depth of Charge/Discharge 0 % ~ 100 %' |
| usable_dod_pct | 100 |
| usable_energy_kwh | UNKNOWN |
| usable_energy_note | Datasheet prints 'Depth of Charge/Discharge 0 % ~ 100 %' but no separate usable-energy row. |
Physical / mechanical
| cooling | Intelligent liquid cooling |
| cooling_note | LIQUID cooled - materially different from the air/natural-convection residential range. |
| corrosion_grade | C4 (default) or C5 (optional) |
| depth_mm | 1610 |
| dimensions_note | 'Dimensions: 1150 mm * 2450 mm * 1610 mm' |
| height_mm | 2450 |
| ip_rating | IP55 |
| mounting | Outdoor free-standing cabinet |
| weight_kg | <= 3200 |
| width_mm | 1150 |
Installation
| auxiliary_power | Internal (default) or External (optional) |
| indoor_outdoor | Outdoor |
| mounting_method | Free-standing cabinet |
| supported_installation_topology | Up to 25 units paralleled on-grid |
Environment
| charge_temperature_c | UNKNOWN |
| discharge_temperature_c | UNKNOWN |
| humidity | 0 % ~ 100 % |
| indoor_outdoor | Outdoor |
| max_altitude_m | 3000 |
| noise | <= 65 dB @ 1 m |
| operating_temperature_c | -30 to 50 (derating above 45) |
| storage_temperature_c | UNKNOWN |
| temperature_note | Datasheet V2 prints a single system operating range, not separate charge/discharge windows. |
Interfaces & connectors
| can | UNKNOWN |
| communication_protocol | Modbus TCP |
| ethernet | True |
| ports | Ethernet |
| rs485 | UNKNOWN |
Protection
| enclosure_ip | IP55 |
| fire_suppression | Combustible gas detector, Smoke detector, Heat detector, Alarm sounder, Hot aerosol fire extinguishing equipment |
Certifications
| listed | ['IEC 62619', 'IEC 63056', 'IEC 62040', 'IEC 62477', 'IEC 61000', 'IEC 62933', 'UN 38.3'] |
Warranty & service
| note | Not printed on datasheet V2. |
| years | UNKNOWN |
Documents
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. |