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Mr Holden – Durham Solar Installation

5.28kW Solar PV System with Fox ESS EP11 Battery Storage

Sustainable Energy Engineering Ltd installed a high-performance 5.28kW AIKO solar PV system for Mr Holden in Durham, supported by a powerful Fox ESS EP11 battery providing 10.36kWh of storage (9.32kWh usable).

The system was designed to significantly reduce annual electricity costs, maximise daytime and stored energy usage, and improve resilience through high-efficiency components and optimised system design.

A full bird-exclusion kit was also installed to protect the system long-term and maintain performance.

Technical Information:

Solar Panel Model:AIKO Neostar 440W
Number of Panels:12
Inverter:Fox ESS H1 G2 3.7kW Hybrid
Battery Storage:Fox ESS EP11 (10.36kWh / 9.32kWh usable)
Total Usable Storage:9.32 kWh
Mounting System:Renusol Roof Mount
Additional Components:Bird Mesh, Generation Meter, AC Isolators


Installation Data

Installed Capacity5.28 kWp
Orientation25° from South
Inclination30°
Postcode Region10
Kk Value888
Shade Factor1.00
Estimated Annual Output4,690 kWh
Annual Consumption (Assumed)3,924 kWh
Self-Consumption (PV Only)1,519 kWh
Self-Sufficiency (PV Only)39%
Usable Storage9.32 kWh
Self-Consumption (PV + Battery)2,925 kWh
Self-Sufficiency (PV + Battery)74%


Environmental Impact

Trees Planted Equivalent25 trees per year
Avoided Fuel Usage413 litres of petrol per year
Avoided Coal Burned470 kg of coal per year


25-Year Financial Summary

Net Present Value (NPV)£21,698.57
Discounted Payback Period7–8 Years
Internal Rate of Return (IRR)High (Strong 17%+ typical)

What these mean:

Net Present Value (NPV) — This calculates the present-day value of all future savings, minus the upfront cost. A positive NPV means the system pays for itself and generates additional financial benefit.

Discounted Payback Period — Shows how long it takes for savings to cover the cost of the system, accounting for inflation and energy price changes.

Internal Rate of Return (IRR) — A measure of how profitable the investment is. A higher IRR means a stronger long-term return compared with traditional financial investments.



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

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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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