Lower Heath Farm: Delivering a High-Capacity Solar & Storage System with Advanced DC-Coupling

The project faced grid connection limitations, which restricted how much solar generation could be exported. Without a battery solution, this would have limited the overall performance and commercial value of the system. The challenge was to: maximise utilisation of a large solar array; overcome grid connection constraints without reducing system size; deliver a high-capacity solution that remained efficient and scalable; and integrate multiple system components seamlessly. This required a more advanced approach to system design, particularly through the use of DC-coupling.

• Supplying the AlphaESS TB250 containerised BESS (940kWh)
• Supporting system configuration for DC-coupled solar integration
• Providing flexibility to adapt to project-specific installation requirements
• Offering technical support to ensure compatibility across system components

Products

• AlphaESS TB250 (940kWh) containerised battery system
• Supply of solar PV panels and mounting kit
• Note: Immersa supported the procurement and supply of equipment but did not carry out installation, demonstrating our flexible approach to supporting partners based on project requirements.

Services

• Technical support for system integration
• Guidance on DC-coupled configuration

The completed system integrates a large-scale solar array with battery storage, using DC-coupling to maximise efficiency and overcome grid constraints. A portion of solar generation is DC-coupled into the battery system, allowing excess energy to be captured and stored rather than exported. The remaining solar capacity is connected via AC-string inverters, ensuring full utilisation of the system. This hybrid approach enables the site to maintain a large solar installation while remaining compliant with grid connection limits. The system is also connected to the Alpha Cloud platform, providing a centralised point for monitoring and ongoing management.

• Overcame grid constraints without reducing solar PV size
• Increased on-site utilisation of renewable generation
• Delivered a high-capacity, future-ready energy solution
• Enabled a more advanced system configuration than standard installations
• Demonstrated strong collaboration between Immersa and Bavenhill

• This project highlights Immersa's ability to support partners on more complex, high-capacity renewable energy schemes. By providing the battery solution and technical expertise, we enabled Bavenhill to deliver a system that goes beyond standard solar installation, incorporating advanced DC-coupling to unlock greater performance.
• It also reinforces Immersa's flexible approach to partnerships, supporting installers across design, supply and technical integration depending on project needs.