BESS Battery Energy Storage System – 271kWh All-in-One Smart ESS

Name: BESS Battery Energy Storage System 125kW - ETEK Electri
SKU: BESS-M-125-271-240

The BESS-M-125-271-240 is an all-in-one BESS battery energy storage system combining 271kWh of LFP storage, a 125kW PCS, 120kW PV input and a built-in STS. It is engineered for reliable PV-ESS-Diesel microgrids in off-grid areas.

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ModelBESS-M-125-271-240

CategoryUncategorized

AvailabilityIn stock

CE & TUV certified
Worldwide shipping
OEM & ODM support

Product Features of BESS Battery Energy Storage System

The BESS-M-125-271-240 BESS battery energy storage system integrates batteries, PCS, STS, MPPT, and an aerosol fire module in one IP54 outdoor cabinet, so site installation stays simple and flexible.

Status Indication: shows system status, including load, storage capacity, and power.
Multi-Mode Operation: multi-level priority control for reliable power from the grid, PV, and loads.
Battery Management: integrated BMS for battery monitoring and protection.
Remote Monitoring: multi-end remote access via self-service platform and device-side protocols.
Easy Installation: IP54 cabinet with flexible installation options.
Microgrid-Ready Switching: built-in 170kVA STS with a switching time below 10ms.
Fire Protection: aerosol fire module and 7-inch resistive touchscreen display.
Cooling: dry self-cooling for operation from -30°C to 60°C (derating above 45°C).

Commercial Applications of BESS Battery Energy Storage System

In off-grid scenarios without city power, this BESS battery energy storage system acts as the core of an “autonomous, reliable, and efficient lifeline energy system.” Solar power is prioritized for supply, the battery provides real-time frequency and voltage regulation and power smoothing, and the diesel generator serves as a stable backup in a tiered solar + battery + diesel generator guarantee.

PV-ESS-Diesel microgrid — PV + energy storage + diesel generator: a tiered, multi-energy microgrid

Applications & Use Cases

Off-grid and remote areas: a complete microgrid battery storage system for locations without city power, supporting development and improved livelihoods.
Solar self-consumption: through the EMS, the system stores energy in the daytime and releases it at night.
Diesel fuel reduction: minimizes generator start-up time, lowering fuel dependence, transportation, and maintenance costs.
Efficient generator operation: absorbs short-term load fluctuations so the diesel generator runs in an efficient, stable range, extending lifespan.
Power quality: suppresses frequency and voltage oscillations from equipment start/stop and renewable fluctuations, giving grid-like stable power.
Critical loads: maintains uninterrupted operation during extreme weather and sudden load changes.
Upgrading diesel-only sites: converts single-diesel generation into a smart, multi-energy complementary microgrid.

Technical Specifications of BESS Battery Energy Storage System

The table below lists the verified datasheet values for this BESS battery energy storage system, covering the battery cluster, PCS, STS, MPPT, and system parameters.

Battery Module
Voltage	57.6V
Capacity	314Ah
Energy	18kWh
Cooling method	Dry self-cooling

Battery Cluster
Rated voltage	864V
Grouping method	1P270S
Rated capacity	314Ah
Output voltage range	756V~950V
Rated energy	271kWh
Max continuous charging current	157A
Max continuous discharge current	157A
Charging operation temperature range	0~45°C
Working / storage humidity	RH≤80%

PCS Parameters
Rated current	181A
PCS overload capacity	×1.1 continuous; ×1.25 (30ms)
PCS output power	125kW
AC port voltage	3P/N/PE, 3P/PE; 380V/400V/415V/440V/460V/480V
Frequency	50/60Hz
Power factor	-1~1
Battery side voltage	810V-950V
Parallel	Max 5 PCS

STS Parameters
Rated power	170kVA
AC voltage	400V/230V (-20%~15%)
Frequency	50/60Hz±5Hz
Max AC current	250A
Switching time	<10ms

MPPT – PV Side
Max power	120kW*2 (120kW)
MPPT voltage range	200V-950V
Rated voltage	600V
Starting voltage	250V
PV input string	4
PV max current	50A+50A+50A+50A
Short-circuit current	60A+60A+60A+60A

MPPT – High Voltage Side
Voltage range	500V-950V
Rated voltage	680V
Max current	180A

System Parameters
*Dimension (WDH)*	212014702230mm
Weight	3210kg
Display	7-inch resistive touchscreen
Fire protection system	Aerosol fire module
Degree of protection	IP54
Certification	CE; IEC62619; UN38.3
Working temperature range	-30~60°C (>45°C derating)
Cooling	Dry self-cooling
Relative humidity	5~95% (no condensing)
Highest altitude	4000m (>2000m derating)

Dimensions and Wiring of BESS Battery Energy Storage System

The BESS battery energy storage system cabinet measures 2120mm (W) × 1470mm (D) × 2230mm (H) and weighs 3210kg. Front, side and back views are shown below.

Dimensions and Wiring of BESS Battery Energy Storage System

In the wiring topology, the diesel generator and load connect on the AC bus (red), while the PV array, PCS, and battery pack link over the DC bus (blue). The BMS and EMS communicate with the EMSU, dispatching platform, and cloud platform over the communication cable (green). This layout lets the STS switch between sources in under 10ms.

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