SunWell Energy

115kWh Intelligent Microgrid ESS

Q: Will this system work with my existing 400V three-phase grid?

Yes. The SW-iESS-W125-TD connects to a 3P+N+PE 400Vac grid with a 320–460Vac range and 50/60Hz self-adaptation, fitting most commercial sites without an isolation transformer.

Q: How much energy does it store and how big a load can it run?

It stores 115.2kWh at 768V and delivers 50kW continuous AC (55kW peak), covering essential commercial loads such as lighting, HVAC, and machinery during outages or peak periods.

Q: Can I add more capacity later?

Yes. The all-in-one cabinet is modular with N+1 redundancy, and you can parallel or add units to enlarge the system as your site's energy demand grows.

Q: How is the system protected from fire and faults?

It uses a two-level fire-extinguisher system—aerosol plus HFC-227ea, PERFLUORO optional—with inbuilt BMS/PCS/EMS fault detection and heat management inside an IP54 enclosure.

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Model SW-iESS-W125-TD

The 115kWh Intelligent Microgrid ESS is an all-in-one LiFePO4 system for homes and small businesses needing backup and solar self-use. Adding more modules keeps the same inverter and wiring, so capacity grows exactly as demand grows. Its IP54 rating lets it run reliably in dusty or humid spaces.

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115kWh Intelligent Microgrid ESS — Technical Specifications
MODEL	SW-iESS-W125-TD
Battery Specification
Battery Type	LFP
Cell Capacity	3.2V/150Ah
PACK	1P20S
PACK Qty	12
Rated Capacity	115.2kWh
Rated Voltage	400Vac
Voltage Range	320Vac-460Vac
Charge/ Discharge Rate	0.5C Rated
Depth Of Discharge	95%
Cooling Method	Industry level Air Conditional
Fire Fighting System	Two Level Protection ,Standard: Aerosol+HFC-227ea; Optional: PERFLUORO
AC Specifications
Rated Voltage	400Vac
Voltage Range	320Vac - 460Vac
Frequency Range	50/60+2.5Hz
Grid System	3P+N+PE
Isolation Transformer	No
Rated Power	50kW
Peak Power	55kW
Rated Current	72A
Overload Capacity	≤110% Continues Running, ≤120% 1Min
Power Factor	-0.99~+0.99
On Grid THDI/ Thdv (Off Grid)	<3%,Full load
STS Module Power Capacity	200kW
Transfer Time	≤20ms
PV Specification
Max. PV Input Voltage	650Vdc
Max. PV Input Power	55kW
No. Of MPPT/ String Per MPPT	1/1
MPPT Voltage Range	200-650Vdc
MPPT Current	100A
MPPT Efficiency	99%
System Specification
Operating Temperature	-25°C~65°C ,＞45°C power derating
Storage Temperature	-40 to 75°C
Noise	<70 dB
Product Dimension(W×D×H)	1850×1355×2150
Net Weight	1800kg
IP Class	IP54
EMS	Manual Mode, Peak saving, virtual enlargement, New Energy power absorption, Anti-flow mode.; Support remcte management and control
Communication Protocol	Modbus RTU, Modbus TCP, IEC104, MQTT, Etc.
Communication	RS485/RJ45/4G/WIFI/DIDO

Features

All-in-one architecture integrates battery, inverter and management. The system combines storage, a hybrid inverter and MPPT in one enclosure, cutting installer time and wiring.
Built-in inverter and MPPT handle solar, grid and backup. It harvests PV, powers loads and switches to battery backup within moments of an outage, with no manual action.
Intelligent EMS optimizes self-consumption and savings. The system routes power between solar, battery, grid and load in real time, enabling time-of-use scheduling and peak shaving.
Real-time monitoring keeps status visible. Through the unit display communication you can check state-of-charge, power flow and faults on site or remotely.
Safe LiFePO4 chemistry with multi-layer protection. Inherently stable cells plus system safeguards monitor over-voltage, over-current and temperature during daily operation.
Scalable storage expands as demand grows. Add battery modules or parallel units to increase capacity, protecting your initial investment as needs rise.

Applications

Commercial & Industrial Backup: Keeps production lines, lighting, and IT systems running during grid outages.
Microgrid Deployment: Acts as the core storage block in large-scale microgrids with PV and diesel sources.
Peak Shaving: Reduces demand charges by discharging during high-tariff peak hours.
Solar Self-Consumption: Stores daytime PV from its 55kW input for evening and night use.
Remote & Off-Grid Sites: Supplies stable three-phase power where grid access is limited.
Critical Facility Support: Powers telecom, cold-storage, or medical loads that cannot tolerate interruption.

Energy Management & System Architecture

The SW-iESS-W125-TD is built around a 115.2kWh LFP battery bank configured as a single 768V string of 12 packs (1P20S cells), delivering energy storage at 0.5C with 95% DOD and air cooling for stable thermal performance. The inbuilt PCS converts the DC battery and PV energy into clean 400Vac three-phase AC, while the integrated MPPT accepts up to 55kW of PV input at 99% efficiency across a 200–650Vdc range.

An inbuilt EMS manages power flow across generation, storage, and load, supporting manual mode, peak saving, virtual enlargement, new-energy absorption, and anti-flow strategies with remote monitoring and control. Intelligent control coordinates active and reactive power adjustment and load management, so the system charges from solar or grid and discharges to cover site loads or export, keeping energy balanced around the clock.

Grid, Backup & System Integration

The SW-iESS-W125-TD operates in both grid-connected and off-grid modes, switching between them through an inbuilt STS in ≤20ms to keep critical loads uninterrupted during outages. A wide 320–460Vac grid range and 50/60Hz self-adaptation simplify integration with existing commercial electrical systems, while the transformer-less design raises overall system efficiency.

For backup and savings, the EMS runs peak-shaving and anti-flow strategies, discharging stored solar during high-tariff periods and preventing unwanted export. The all-in-one cabinet supports modular, N+1 redundant expansion and parallel integration with PV, diesel generators, and larger microgrids, letting operators scale capacity and power as the site grows.

Warranty

LiFePO4 batteries for 5 years, hybrid inverters for 2 years, and solar panels under the supplier policy of a 10-year product warranty plus 30-year linear power warranty. If you experience any quality issues within the applicable warranty period, please contact us and we will arrange a replacement or repair promptly.

Frequently Asked Questions

Will this system work with my existing 400V three-phase grid?

Yes. The SW-iESS-W125-TD connects to a 3P+N+PE 400Vac grid with a 320–460Vac range and 50/60Hz self-adaptation, fitting most commercial sites without an isolation transformer.

How much energy does it store and how big a load can it run?

It stores 115.2kWh at 768V and delivers 50kW continuous AC (55kW peak), covering essential commercial loads such as lighting, HVAC, and machinery during outages or peak periods.

Can I add more capacity later?

Yes. The all-in-one cabinet is modular with N+1 redundancy, and you can parallel or add units to enlarge the system as your site's energy demand grows.

How is the system protected from fire and faults?

It uses a two-level fire-extinguisher system—aerosol plus HFC-227ea, PERFLUORO optional—with inbuilt BMS/PCS/EMS fault detection and heat management inside an IP54 enclosure.

Expert Support

Our team of solar energy experts is ready to help you find the perfect solution for your needs.

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We typically respond to all inquiries within 24 hours during business days.

Custom Solutions

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115kWh Intelligent Microgrid ESS