261kWh C&I Battery Storage System for Solar Retrofit
Created on 09.18
Adding battery storage to an existing commercial solar system can help businesses use more solar energy, reduce peak electricity demand, and shift surplus daytime generation to evening hours.
A 125kW / 261kWh C&I Battery Energy Storage System (BESS) is a practical solution for factories, warehouses, commercial buildings, farms, EV charging sites, and other medium-sized commercial applications.
Why Add Battery Storage to Existing Solar?
Many commercial PV systems generate surplus electricity during the day but still purchase power from the grid during peak or evening periods.
A 261kWh BESS can store surplus solar energy and discharge it when needed:
Daytime:
Solar PV → Load → Battery Charging
Evening / Peak Hours:
Battery → Load
Typical applications include:
- Solar self-consumption
- Peak shaving
- Time-of-use energy shifting
- PV export limitation
- Backup power
- EV charging support
Typical 125kW / 261kWh Configuration
A typical system can include:
Item | Configuration |
Battery Capacity | 261kWh |
PCS Power | 125kW |
Battery Chemistry | LiFePO4 (LFP) |
Cooling | Liquid Cooling |
Control | BMS + EMS |
Installation | Outdoor C&I |
Application | Solar + Storage / Peak Shaving / Backup |
The final configuration depends on project requirements and local grid regulations.
Easy Retrofit for Existing PV Systems
For many existing commercial solar projects, an AC-coupled BESS is a practical retrofit solution.
The existing PV inverter can remain in operation while the battery system connects separately to the AC bus:
PV → Existing Solar Inverter → AC Bus
261kWh Battery ↔ PCS ↔ AC Bus
AC Bus ↔ Load / Grid
This can reduce modifications to the existing PV system and makes battery storage easier to add to operating commercial sites.
Is 261kWh Right for Your Project?
Battery capacity should not be selected based only on PV capacity.
For example, if a facility has a 70–80kW evening load, two hours of operation may require roughly 140–160kWh before considering system losses, reserve capacity and battery operating limits.
To select the correct BESS, we normally evaluate:
- Existing PV capacity
- Daily or hourly load profile
- Peak load
- Grid voltage
- Surplus solar generation
- Electricity tariff
- Required backup time
- Project location
Depending on the load profile, a 261kWh system may be suitable, or a different capacity may provide better economics.
Safety and Smart Energy Management
For commercial battery storage, safety and system control are as important as battery capacity.
A complete C&I BESS should consider:
LFP Battery + BMS + Liquid Cooling + Fire Protection + PCS + EMS
The EMS coordinates solar, battery, grid and facility loads to support peak shaving, solar self-consumption, scheduled charging/discharging and other operating strategies.
Required certifications such as IEC 62619, UL 9540A or local grid and fire-safety standards should be confirmed according to the destination market.
EnergyStar Solar + Storage Solution
EnergyStar supports integrated commercial energy storage projects rather than supplying only a battery cabinet.
Depending on the project, the solution can include:
PV Modules + Inverter/PCS + 261kWh BESS + EMS + BOS + Technical Coordination
We work with solar installers, EPCs, distributors and project developers on both existing PV retrofit and new PV + storage projects.
Planning a Commercial Solar Retrofit?
💡
Send us:
PV Capacity + Load Profile + Grid Voltage + Project Location
We can evaluate whether a 125kW / 261kWh C&I BESS is suitable and recommend the appropriate system configuration.
Applications: Solar Retrofit | Peak Shaving | Self-Consumption | Backup Power | EV Charging | C&I Microgrid
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