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Sharp – Durham Solar Installation (2025)

7kW Solar PV System with 16.59kWh Battery Storage & Zappi EV Charger

The Sharp household in Durham selected a high-performance renewable package consisting of a 7kW JA Solar array, Fox ESS hybrid inverter, a large-capacity 16.59kWh battery storage system, and a MyEnergi Zappi EV charger. This provides excellent self-sufficiency, flexible EV charging, and strong year-round energy generation.

The Fox ESS ECS4300H-H4 battery module delivers **14.93kWh usable capacity**, helping the property reach **79% energy independence** and significantly reduce grid reliance. Full bird protection and scaffolding were included as standard.

Technical Information:

Solar PanelsJA Solar DeepBlue 4.0 Pro 500W
Number of Panels14
InverterFoxESS H1-6.0-E-G2 (6.6kW)
Battery StorageFoxESS ECS4300H-H4 (16.59kWh / 14.93kWh usable)
EV ChargerMyEnergi Zappi (Untethered)
Mounting SystemRenusol Roof Mount
Additional ComponentsBird Mesh, Scaffolding, AC Isolators, Generation Meter


Installation Data

Installed Capacity7 kWp
Orientation20°
Inclination30°
Postcode Region10
Kk Value894
Shade Factor1.00
Estimated Annual Output6,260 kWh
Self-Consumption (PV Only)1,333 kWh
Grid Independence (PV Only)42%
Battery Usable Capacity14.93 kWh
Self-Consumption (With Battery)2,567 kWh
Grid Independence (With Battery)79%


25-Year Financial Summary

Net Present Value (NPV)£19,314.62
Discounted Payback Period9–10 years
Internal Rate of Return (IRR)12.9%

NPV Explained: Net Present Value reflects the lifetime financial benefit of the installation after adjusting future savings for inflation. A positive NPV confirms a strong long-term investment.

Discounted Payback Explained: This method calculates payback using inflation-adjusted savings, giving a more realistic timeline than simple payback.

IRR Explained: IRR shows the annual return generated by the system. An IRR above 10% is typically considered a very strong performance for domestic energy investments.



Warranty Information

JA Solar DeepBlue 4.0 Pro Panels25-year product, 30-year performance
FoxESS H1-6.0-E-G2 Inverter5-year warranty
FoxESS ECS4300H-H4 Battery10-year warranty


Project Gallery:

Cut Your Energy Bills - Start Today.

2,000+ Solar Installs Completed in the North East.

CALL 0191 340 7001


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We've helped homeowners across the North East cut energy bills and reduce carbon emissions with bespoke domestic solar systems, from family homes to larger residential properties. Alongside this, we've delivered projects for schools like Cragside and Dame Dorothy, community hubs such as Kibblesworth Millennium Centre and Alnwick Community Centre, local cafes, churches, and even national brands like Burger King. With major installs for organisations including Darlington College, Phillips Pet Supplies, and Collingwood Healthcare Services, our portfolio shows proven expertise across both domestic and commercial solar - providing tailored installations that deliver long-term savings and sustainability.

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