257KWH Lithium Battery Outdoor All-in-One Cabinet with 125KW PCS for C&I Solar Energy Storage System
This Sail Solar 257kWh energy storage cabinet is based on long-life battery cells, intelligent air cooling, and a highly integrated safety design. Balancing performance, safety, deployment efficiency, and return on investment, it is the preferred standardized outdoor energy storage solution for industrial and commercial users to achieve cost reduction, power supply security, and green energy consumption.
Номер товара :
BESS-P257Аккумулятор :
LiFePo4Охлаждение :
Air CoolingКоммуникационный порт :
CAN, RS485Емкость :
257KWHВыходное напряжение :
380V / 400VКласс защиты :
IP54Гарантия :
10 YearsСертификат :
CE EMC UN38.3 CBТип :
All-in-one ESSThe Sail Solar 257kWh battery outdoor air-cooled energy storage cabinet has a rated power of 125kW and a capacity of 257kWh. It uses lifepo4 cells and intelligent air-cooled temperature control, and is suitable for on-grid/off-grid/photovoltaic-storage scenarios. It meets core requirements such as peak shaving, backup power, and demand response. It is easy to deploy, worry-free in operation and maintenance, and has a better total life cycle cost.

Specification
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MODEL
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BESS-P257 |
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| Battery Energy(kWh) |
257KWH |
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| Rate Power |
125KW |
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| AC Output |
400V, 3W+PE, 50Hz/60Hz |
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| Transfer Time |
≤20ms |
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| Communication |
RS232/RS485/CAN/BLUETOOTH/ WIFI |
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Cooling Method
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Intelligent Air Cooling
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Storage Temperature Range
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-20~50°C
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Operation Temperature
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0~50°C |
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Humidity
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0%RH~95%RH |
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Altitude
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≤3000m
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Safety System
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Aerosol
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BATTTERY PARAMETERS
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Battery Chemistry
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LiFePO4
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| Nominal Capacity |
314Ah |
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| Composition Method |
1P256S |
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| Nominal Voltage |
819.2V |
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| Operating Voltage Range |
716.8 ~ 921.6 V |
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| Efficiency |
>94% (DC side) |
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Max. Charge/Discharge Rate
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0.5P |
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Max. Depth of Discharge
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100% (25 ± 2 ℃)
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| Cycle |
6000 cycles 80%DOD, 0.5C |
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Calendar Life
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10 years |
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PCS PARAMETERS
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|||
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Max DC power
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215kw/1min |
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| Rate Operating Voltage |
AC 400VAC |
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| Approved Grid Frequency Range |
50/60Hz |
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| AC Harmonic Voltage |
<3% (more than 30% load) |
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Voltage Deviation
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<5% (linear load) (phase<3%) |
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| MECHANICAL SPECIFICATIONS | |||
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Machine Dimension (W*H*D)(mm)
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1845*1415*2381 |
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| N.W(kg) |
3800 |
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| IP Grade |
IP54 |
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Certification & Standards
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CB, CE, EMC, UN38.3, RoHs |
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Product Description

Cabinet Structure:
* Battery PACK: The energy core, responsible for storing and releasing electrical energy.
* PCS: Enables bidirectional conversion between DC power from the battery and AC power from the grid/load, controlling charging and discharging.
* Heating and Cooling Temperature Control System: Provides a constant temperature environment for the battery and electronic equipment, ensuring stable operation over a wide temperature range and extending battery life.
* Fire Protection: Smoke sensors + aerosol fire extinguishing devices provide early warning and fire suppression.
* Power Distribution Protection: Surge protectors (SPDs), emergency stop switches, door magnetic sensors, and circuit breakers ensure the safety of equipment and personnel.

System Core:
- High-Voltage Control Box: The power distribution and control center of the energy storage system, integrating main battery access, PCS interaction interface, local status display, multi-cabinet parallel connection, and wireless communication functions to achieve safe start/stop and centralized management of system status.
- Battery Module: The basic energy unit of the system, responsible for the storage and release of electrical energy. It features a built-in cooling fan and dust-proof design to ensure stable cell operation and enables centralized monitoring and management through a communication interface.

Collaborative Operation:
DC Side:
Energy Storage Cabinet (ESS) ↔ Inverter: The energy storage unit is connected to the PCS via the DC bus, enabling bidirectional charging and discharging control of electrical energy.
PV String → PV Combiner Box → Inverter: PV DC power is first collected by the combiner box and then sent to the inverter, collaborating with the energy storage side.
AC Side:
Inverter → Load: Directly supplies power to electrical equipment in factories, buildings, etc.
Inverter ↔ Grid: During grid-connected operation, it interacts bidirectionally with the grid to achieve peak-valley arbitrage and peak shaving; in off-grid/standby mode, ESS + PV power the load, and a generator can also be connected as a backup power source.
Послепродажное обслуживание
● Послепродажная поддержка 7/24
● 7 дней в неделю, 24 часа в сутки: Готовность немедленно реагировать и решать проблемы — приверженность Sail Solar беззаботному послепродажному обслуживанию.
● Электронная почта службы поддержки: info@sailsolaress.com
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