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Sungrow

Commercial Battery Storage


Commercial Battery Storage Solutions for the UK Solar Industry


As the UK accelerates its transition to renewable energy, commercial and industrial battery energy storage is becoming a vital part of modern solar energy systems. 

For professionals working with commercial and industrial sectors, integrating battery storage increases return on investment, helps customers meet sustainability goals, and ensures long-term cost efficiency and energy resilience. 

Commercial battery storage systems enable UK businesses to store surplus solar energy and utilise it during periods of peak demand or high electricity tariffs. For companies delivering commercial solar installations, integrating battery storage adds significant value to the overall energy solution—enhancing system efficiency, reducing grid reliance, and supporting a more comprehensive approach to energy management.

Main features:

  • Increased Solar Self-Consumption - Help customers maximise the use of their on-site solar energy, reducing reliance on the grid and minimising export losses.
  • Additional Revenue Streams - When a business installs a commercial battery storage system, it can do more than just store excess solar energy — it can also participate in national energy markets to generate income. This is typically achieved through two main routes in the UK:

    1. Grid Balancing Services - The National Grid occasionally requires support to maintain real-time balance between electricity supply and demand. Businesses with battery storage can contribute by either discharging stored energy to the grid or temporarily reducing consumption. In return, they receive financial incentives or capacity payments.
    2. Demand-Side Response (DSR) - DSR schemes involve adjusting on-site energy usage in response to grid signals during periods of peak demand or system stress. With battery storage, businesses can participate by discharging energy or shifting loads, earning compensation in return.
  • Reduced Electricity Costs - Rely on battery storage to offset energy use during peak pricing, cutting costs and improving efficiency.
  • Energy Security - Maintain critical operations by providing reliable backup power in the event of grid instability or power loss.
  • Enhanced Sustainability - Improve business's green credentials by maximising the use of renewable energy.

Here are some practical applications:

Peak Shaving

Reduce demand charges by discharging stored energy during periods of peak consumption.

Load Management

Align energy consumption with on-site generation to create a more stable and efficient energy profile.

Backup Power Supply

Enhance energy resilience by providing reliable backup power during grid interruptions or outages.

EV Charging Integration

Support low-carbon transport strategies by combining solar and storage to enable efficient electric vehicle (EV) fleet charging.

Integrating battery storage into a solar PV system is central to delivering efficient, scalable, and long-term energy solutions for UK businesses. Choosing the right energy storage system ensures maximum return on investment, enhanced energy resilience, and long-term sustainability.

When designing and installing C&I battery energy storage systems, it’s important to assess several technical and site-specific factors to ensure reliable performance and long-term value for the end user:

  • Energy Usage Profile: Understanding the customer’s typical energy consumption and peak demand periods helps determine the appropriate battery size and discharge strategy.
  • Installation Space : Evaluate the available space for installation, whether indoors or outdoors. It is important to consider factors such as ventilation, safety clearances, and compliance with UK electrical and fire safety regulations.
  • Scalability and Flexibility: Choose modular battery solutions that can grow with the customer’s energy demands. This ensures the system remains adaptable as businesses expand.
  • Grid Connection and Compliance: The systems should meet UK requirements for grid connection, including those set by the Distribution Network Operator (DNO) and G99 standards. Proper compliance is essential for system approval and participation in grid-related services.

As an established distributor of battery storage systems, Alternergy provide UK installers with the products and support needed to deliver high-performance energy solutions to their clients.

Our C&I battery storage systems offerings include flexible and scalable storage options suitable for various site sizes and energy profiles


We supply high-performance battery storage systems in the UK designed for commercial applications, from trusted manufacturers including DunextSungrow, and Sunwoda.

Enhance your solar installations with reliable, scalable storage solutions. Please contact our team, or register now for trade pricing and dedicated installer support. 


Dunext PowerHill P100-215kWh

Sungrow PowerKeeper Energy Storage (COMING SOON)

Unsure about key battery storage terminology?
View our A–Z Battery Storage Glossary
[SG-STC12.5-Powerkeeper] Sungrow PowerKeeper 12.5kWh Battery Module Sungrow PowerKeeper001.webp Upcoming Check Availability
Sungrow PowerKeeper 12.5kWh Battery Module
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Sungrow | Alternergy

Sungrow PowerKeeper 12.5kWh Battery Module


Sungrow’s PowerKeeper Series is a modular C&I energy storage solution built to maximize solar value, eliminate oversizing, and ensure continuous power even during grid outages.

DC-coupled and designed for today’s C&I challenges, PowerKeeper is built around Sungrow’s SH-CX series C&I hybrid inverters, simplifying the full lifecycle from installation to long-term operation. With a 12.5 kWh modular architecture scalable from 50 to 1000 kWh per hybrid inverter and expandable further with multiple inverters, PowerKeeper suits sites from small businesses to large industrial facilities, delivering precise capacity matching and lower upfront costs.

Based on Sungrow’s “Ace 007, Ace Profit” concept, it delivers:

  • 0 Waste: Accurate capacity matching and maximum solar utilization
  • 0 Outage: Seamless backup for business continuity
  • 7 Ups: A smoother, more efficient experience end to end

Learn More About Sungrow PowerKeeper System
Proven Experience, Trusted Partner

With over 1,000 C&I energy storage projects deployed globally, including 200+ projects across Europe, Sungrow brings deep field experience and end-to-end service capabilities to every installation.

One System, Multiple Applications

PowerKeeper adapts seamlessly to diverse C&I scenarios:

  • PV + ESS
  • PV + ESS + EV charging
  • Microgrid & backup
  • Stand-alone C&I energy storage
  • Off-grid and hybrid applications
0 Waste: Modular by Design

PowerKeeper is designed to protect every customer’s investment through a highly flexible, modular configuration. Built on a 12.5 kWh module architecture, a single hybrid inverter supports 50–1000 kWh of storage with 2–8 hours of duration. For larger requirements, multiple inverters can be connected in parallel, enabling seamless and scalable system expansion.

This modular approach enables precise capacity matching across applications, from small supermarkets to large industrial facilities, maximising energy utilisation, reducing upfront costs, and improving system efficiency.

0 Outage: Continuous Power for Critical Operations

PowerKeeper delivers seamless backup power to keep businesses running without interruption, even during grid failures. It supports critical loads in supermarkets, factories, warehouses, and commercial buildings.

  • 10 ms ultra-fast switching to off-grid mode during grid outages
  • Built-in Automatic Transfer Switch (ATS) supporting up to 250 kW load
  • No external ATS cabinet required, saving space, time, and cost
7 Ups: A Better Experience at Every Step
    1. Easy Installation

The system includes AI cell-level health monitoring of cell temperature, current and voltage.

  • Choice of 12.5 kWh single modules or 50 kWh pre-built stacks
  • Fits even in tight spaces; manual handling or forklift-friendly
    2. Fast Deployment & Commissioning
  • Plug-and-play design
  • 3-step commissioning in under 5 minutes via iSolarCloud
  • Unified monitoring for PV, storage, and EV charging
    3. Reliable Operation in Harsh Environments
  • Operates in water up to 50 cm depth
  • IP66 & C5 corrosion protection
  • Wide operating range: –20°C to +55°C, ≤60 dB noise
  • Type I + II lightning protection
    4. Simple Maintenance
  • Replacement without repair
  • Pack-level balancing within ≤48 hours
  • Supports mixing old and new batteries for flexible upgrades
    5. Profit Optimisation

PowerKeeper supports multiple revenue streams:

  • Self-consumption
  • Energy arbitrage
  • Frequency response (FFR)
  • Demand control

AI-driven operating modes automatically optimise strategies using real-time electricity prices, PV generation forecasts, and load predictions.

    6. Comprehensive Safety
  • 5D alerts: current, voltage, temperature, smoke, and water immersion
  • Triple-guard protection at cell, pack, and plant levels
  • Appliance-level safety for daily operation
    7. Long-Term Value

A future-proof system that grows with the business, reduces risk, and maximises lifetime returns.


TECHNICAL INFORMATION:

Battery (DC):

  • Cell Type: LFP 3.2 V
  • Nominal Capacity: 12.48 kWh
  • Depth of discharge (DOD): 100%
  • Nominal voltage range: 32.4 V ~ 43.8 V
  • Nominal charge / discharge rate: 0.5P
[ST255CS-125KW-2H] Sungrow PowerStack ST255CS-2H Battery Storage - 5Y Warranty PowerStack ST255kWh-125kW-3.webp New!
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Sungrow PowerStack ST255CS-2H Battery Storage - 5Y Warranty
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Sungrow | Alternergy

Sungrow PowerStack ST255CS-2H Battery Storage - 5Y Warranty

125 kW AC Inverter + EMS + Commissioning + Shipping


The Sungrow PowerStack ST255CS-2H is a liquid-cooled battery energy storage system (BESS) designed for commercial and industrial (C&I) applications. Using 314Ah lithium iron phosphate (LFP) battery cells, it delivers 257 kWh of storage capacity with a 125 kW inverter per container, supporting applications such as peak shaving, renewable energy integration, backup power, and demand management. Its all-in-one architecture integrates the PCS, BMS, and battery components in a compact cabinet for simplified installation and operation.

Operating at a 0.5C rate, the system enables a full charge or discharge in around two hours. With over 90% round-trip efficiency, PCS efficiency up to 98.5%, and a design lifetime of up to 20 years, the PowerStack 255CS ensures reliable performance.

Learn More About Sungrow PowerStack 255-2H Commercial Storage System
✔  Supports Different C&I Scenarios

Sungrow PowerStack Commercial & Industrial Energy Storage System is designed to support multiple business models like demand response, emergency backup, peak shaving, and grid support, enhancing overall energy management and potentially reducing costs.

✔  Easy Installation & Flexible Configuration

The system features a flexible design that allows cabinets to be installed face-to-face, back-to-back, or side-by-side without separation spaces, optimising available site area. It supports up to 25 units in parallel (on-grid mode), scaling system capacity from 257 kWh to 6.4 MWh for larger commercial and industrial energy storage projects.

The system is primarily designed for AC-coupled energy storage systems using its integrated PCS - it can also be integrated into a DC-coupled PV system, depending on system design.

With pre-installed and pre-commissioned components, installation and grid connection are faster and more efficient. System commissioning can be completed quickly through a simplified one-click setup process.

✔  Power with Quality and Stability

The system supports on-grid, off-grid, and automatic switching, allowing flexible operation across different energy scenarios. The PowerStack 255CS series also features grid-forming technology, enabling stable operation in complex grid environments and supporting MW-level black start capability. This ensures reliable and efficient power supply for both grid-connected and off-grid commercial and industrial applications.

✔  Intelligent Liquid Cooling

The Sungrow PowerStack features efficient liquid-cooling technology with AI-driven thermal balancing, ensuring uniform heat dissipation and maintaining a cell temperature difference of ≤2.5°C. The system also includes AI-based pack-level health monitoring, continuously analysing cell temperature, current, and voltage to optimise performance, improve energy efficiency, and extend the overall system lifespan.

✔  High-Level Protection for All Environments

Designed for extreme conditions, the system operates from -30°C to 50°C , and at altitudes of up to 3,000 meters.

It is designed for outdoor installation and features an IP55 rating for protection against dust and water jets.

In addition, it offers a C5 corrosion resistance - a very high level of corrosion protection. The system is suitable for highly corrosive environments often found, for example, in places with high humidity, in industrial facilities, and coastal areas.

✔  Comprehensive Safety Features

Sungrow ST225CS battery energy storage utilises five layers of safety protection, including multi-level fuse protection, multistage overcurrent protection, fast breaking and arc extinguishing, and over-temperature protection. The system has a separate fire-resistant compartment.

All these features are meant to contain and minimise the impact of any potential faults and to enhance the overall safety and reliability of the system.

✔  Three-layer Fire Safety to Suppress Thermal Runaway

Sungrow ST225CS-2H provides a three-layer fire safety design, accurate early warning of thermal runaway, timely fire protection, and anti-explosion.

The fire protection system layers:

  • Early Warning: it includes a flammable gas detector, a smoke detector, and a heat detector.
  • Explosion Venting: Equipped with an explosion vent panel. The cabinet enclosure provides up to 2 hours of fire resistance.
  • Fire Protection: extinguish fire immediately to reduce damage. FK5112 gas is used as a fire suppression agent, as well as fire sprinklers .
✔  Intelligent Wireless O&M

The system includes advanced local and remote monitoring via the web or iSolarCloud app, providing real-time data and alerts for quick identification and troubleshooting.

Additionally, remote software updates are possible, significantly reducing operational and maintenance costs, and enabling a more streamlined and cost-effective energy management experience.

✔  Certified for Safety and Compliance

The system meets top-tier global safety certifications, including UL9540 and NFPA855/69/68/14, ensuring the highest standards of protection.

Technical Information:

System

  • Rated ESS capacity: 257 kWh
  • RTE (Round Trip Efficiency): ≥ 90%
  • System Degree of Protection: IP55
  • Operating Temperature [℃]: -30°C to 50°C (>45°C derating)
  • System Dimension (WxHxD): 1150 x 2450 x 1610 mm
  • Weight: ≤ 3.2 tonnes
  • Standard 5-Year Warranty

Battery (DC)

  • Cell Material: LFP
  • Rated battery capacity: 314Ah
  • Battery String Configuration: 256S1P
  • Voltage range: 691.2V~934.4 V

PCS (AC)

  • Max. output power 125kW
  • Nominal Voltage: 400V
  • PCS max efficiency: 98.5%
  • Grid Voltage Range: 340V–440V
  • Nominal frequency: 50 Hz / 60 Hz
  • AC current harmonics THDi ≤ 3.0 %

 

[ST510CS-125KW-4H] Sungrow PowerStack ST510CS-4H Battery Storage - 5Y Warranty New!
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Sungrow PowerStack ST510CS-4H Battery Storage - 5Y Warranty
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Sungrow | Alternergy

Sungrow PowerStack ST510CS-4H Battery Storage - 5Y Warranty

125 kW AC Inverter + EMS + Commissioning + Shipping


The Sungrow PowerStack ST510CS-4H is a liquid-cooled battery energy storage system (BESS) designed for commercial and industrial (C&I) applications. Using 314Ah lithium iron phosphate (LFP) battery cells, it delivers 514 kWh of storage capacity with a 125 kW inverter per container, supporting applications such as peak shaving, renewable energy integration, backup power, and demand management. Its all-in-one architecture integrates the PCS, BMS, and battery components in a compact cabinet for simplified installation and operation.

Operating at a 0.25C rate, the system enables a full charge or discharge in around four hours. With over 90% round-trip efficiency, PCS efficiency up to 98.5%, and a design lifetime of up to 20 years, the PowerStack 510CS ensures reliable performance.

Learn More About Sungrow PowerStack 510CS-4H Commercial Storage System
✔  Supports Different C&I Scenarios

Sungrow PowerStack Commercial & Industrial Energy Storage System is designed to support multiple business models like demand response, emergency backup, peak shaving, and grid support, enhancing overall energy management and potentially reducing costs.

✔  Easy Installation & Flexible Configuration

The system features a flexible design that allows cabinets to be installed face-to-face, back-to-back, or side-by-side without separation spaces, optimising available site area. It supports up to 25 units in parallel (on-grid mode), scaling system capacity from 510 kWh to 12.85 MWh for larger commercial and industrial energy storage projects.

The system is primarily designed for AC-coupled energy storage systems using its integrated PCS - it can also be integrated into a DC-coupled PV system, depending on system design.

With pre-installed and pre-commissioned components, installation and grid connection are faster and more efficient. System commissioning can be completed quickly through a simplified one-click setup process.

✔  Power with Quality and Stability

The system supports on-grid, off-grid, and automatic switching, allowing flexible operation across different energy scenarios. The PowerStack 510CS series also features grid-forming technology, enabling stable operation in complex grid environments and supporting MW-level black start capability. This ensures reliable and efficient power supply for both grid-connected and off-grid commercial and industrial applications.

✔  Intelligent Liquid Cooling

The Sungrow PowerStack features efficient liquid-cooling technology with AI-driven thermal balancing, ensuring uniform heat dissipation and maintaining a cell temperature difference of ≤2.5°C. The system also includes AI-based pack-level health monitoring, continuously analysing cell temperature, current, and voltage to optimise performance, improve energy efficiency, and extend the overall system lifespan.

✔  High-Level Protection for All Environments

Designed for extreme conditions, the system operates from -30°C to 50°C , and at altitudes of up to 3,000 meters.

It is designed for outdoor installation and features an IP55 rating for protection against dust and water jets.

In addition, it offers a C5 corrosion resistance - a very high level of corrosion protection. The system is suitable for highly corrosive environments often found, for example, in places with high humidity, in industrial facilities, and coastal areas.

✔  Comprehensive Safety Features

Sungrow ST510CS battery energy storage utilises five layers of safety protection, including multi-level fuse protection, multistage overcurrent protection, fast breaking and arc extinguishing, and over-temperature protection. The system has a separate fire-resistant compartment.

All these features are meant to contain and minimise the impact of any potential faults and to enhance the overall safety and reliability of the system.

✔  Three-layer Fire Safety to Suppress Thermal Runaway

Sungrow ST510CS-4H provides a three-layer fire safety design, accurate early warning of thermal runaway, timely fire protection, and anti-explosion.

The fire protection system layers:

  • Early Warning: it includes a flammable gas detector, a smoke detector, and a heat detector.
  • Explosion Venting: Equipped with an explosion vent panel. The cabinet enclosure provides up to 2 hours of fire resistance.
  • Fire Protection: extinguish fire immediately to reduce damage. FK5112 gas is used as a fire suppression agent, as well as fire sprinklers .
✔  Intelligent Wireless O&M

The system includes advanced local and remote monitoring via the web or iSolarCloud app, providing real-time data and alerts for quick identification and troubleshooting.

Additionally, remote software updates are possible, significantly reducing operational and maintenance costs, and enabling a more streamlined and cost-effective energy management experience.

✔  Certified for Safety and Compliance

The system meets top-tier global safety certifications, including UL9540 and NFPA855/69/68/14, ensuring the highest standards of protection.

Technical Information:

System

  • Rated ESS capacity: 514 kWh
  • RTE (Round Trip Efficiency): ≥ 90%
  • System Degree of Protection: IP55
  • Operating Temperature [℃]: -30°C to 50°C (>45°C derating)
  • System Dimension (WxHxD): 2152 x 2470 x 1610 mm
  • Weight: ≤ 5.3 tonnes
  • Standard 5-Year Warranty

Battery (DC)

  • Cell Material: LFP
  • Rated battery capacity: 314Ah
  • Battery String Configuration: 256S2P
  • Voltage range: 691.2V~934.4 V

PCS (AC)

  • Max. output power 125kW
  • Nominal Voltage: 400V
  • PCS max efficiency: 98.5%
  • Grid Voltage Range: 340V–440V
  • Nominal frequency: 50 Hz / 60 Hz
  • AC current harmonics THDi ≤ 3.0 %

 

[SG-Powerkeeper-BMS] Sungrow Powerkeeper BMS Sungrow Powerkeeper101.webp Upcoming Check Availability
Sungrow Powerkeeper BMS
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Sungrow | Alternergy

Sungrow Powerkeeper BMS

The Sungrow PowerKeeper Battery Management System (BMS) is the control core of the PowerKeeper C&I energy storage platform, ensuring safe, efficient, and reliable operation across modular battery systems.


Designed for PowerKeeper’s DC-coupled, modular architecture, the BMS manages and monitors each 12.5 kWh battery module, enabling accurate capacity matching to site requirements. This helps eliminate oversizing, improve solar self-consumption, and support cost-effective system expansion.

Advanced monitoring, protection, and balancing functions safeguard battery health throughout the system lifecycle, supporting long-term reliability and stable operation. During grid disturbances or outages, the BMS plays a critical role in enabling seamless backup power, helping businesses maintain continuity and operational resilience.

Learn More About Sungrow PowerKeeper System
Proven Experience, Trusted Partner

With over 1,000 C&I energy storage projects deployed globally, including 200+ projects across Europe, Sungrow brings deep field experience and end-to-end service capabilities to every installation.

One System, Multiple Applications

PowerKeeper adapts seamlessly to diverse C&I scenarios:

  • PV + ESS
  • PV + ESS + EV charging
  • Microgrid & backup
  • Stand-alone C&I energy storage
  • Off-grid and hybrid applications
0 Waste: Modular by Design

PowerKeeper is designed to protect every customer’s investment through a highly flexible, modular configuration. Built on a 12.5 kWh module architecture, a single hybrid inverter supports 50–1000 kWh of storage with 2–8 hours of duration. For larger requirements, multiple inverters can be connected in parallel, enabling seamless and scalable system expansion.

This modular approach enables precise capacity matching across applications, from small supermarkets to large industrial facilities, maximising energy utilisation, reducing upfront costs, and improving system efficiency.

 

0 Outage: Continuous Power for Critical Operations

PowerKeeper delivers seamless backup power to keep businesses running without interruption, even during grid failures. It supports critical loads in supermarkets, factories, warehouses, and commercial buildings.

  • 10 ms ultra-fast switching to off-grid mode during grid outages
  • Built-in Automatic Transfer Switch (ATS) supporting up to 250 kW load
  • No external ATS cabinet required, saving space, time, and cost
7 Ups: A Better Experience at Every Step
    1. Easy Installation

The system includes AI cell-level health monitoring of cell temperature, current and voltage.

  • Choice of 12.5 kWh single modules or 50 kWh pre-built stacks
  • Fits even in tight spaces; manual handling or forklift-friendly
    2. Fast Deployment & Commissioning
  • Plug-and-play design
  • 3-step commissioning in under 5 minutes via iSolarCloud
  • Unified monitoring for PV, storage, and EV charging
    3. Reliable Operation in Harsh Environments
  • Operates in water up to 50 cm depth
  • IP66 & C5 corrosion protection
  • Wide operating range: –20°C to +55°C, ≤60 dB noise
  • Type I + II lightning protection
    4. Simple Maintenance
  • Replacement without repair
  • Pack-level balancing within ≤48 hours
  • Supports mixing old and new batteries for flexible upgrades
    5. Profit Optimisation

PowerKeeper supports multiple revenue streams:

  • Self-consumption
  • Energy arbitrage
  • Frequency response (FFR)
  • Demand control

AI-driven operating modes automatically optimise strategies using real-time electricity prices, PV generation forecasts, and load predictions.

    6. Comprehensive Safety
  • 5D alerts: current, voltage, temperature, smoke, and water immersion
  • Triple-guard protection at cell, pack, and plant levels
  • Appliance-level safety for daily operation
    7. Long-Term Value

A future-proof system that grows with the business, reduces risk, and maximises lifetime returns.


TECHNICAL INFORMATION:

Battery (DC):

  • Cell Type: LFP 3.2 V
  • Nominal Capacity: 12.48 kWh
  • Depth of discharge (DOD): 100%
  • Nominal voltage range: 32.4 V ~ 43.8 V
  • Nominal charge / discharge rate: 0.5P
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