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Dumbleton, Durham – Solar Installation

7.04kW Jinko Solar PV System with Fox ESS Inverter

Sustainable Energy Engineering Ltd installed a high-efficiency 7.04kW solar PV system for a homeowner in Dumbleton, Durham. The system uses premium Jinko Tiger Neo 440W all-black modules integrated directly into the roof using the GSE inset mounting system for a sleek aesthetic.

The Fox ESS F5000 inverter ensures excellent performance and smart energy management, allowing the homeowner to maximise generation throughout the year.

This system was designed for a customer looking to reduce electricity bills, improve energy independence and benefit from long-term return on investment through a high-quality, low-maintenance solar solution.

Technical Information:

Solar Panel Brand & Model:Jinko Tiger Neo 440W (JKM440N-54HL4R-B)
Number of Panels:16
Inverter:Fox ESS F5000 (5.5kW)
Mounting System:GSE Integrated Roof Inset (2 × 8 panels)
Additional Components:AC Isolators, OFGEM Generation Meter, MCS Certificate, Labour Warranty


Installation Data

Installed Capacity7.04 kWp
Array Split3.52 kWp + 3.52 kWp
Orientation105° & 75°
Inclination45°
Postcode Region10
Kk Values630 & 752
Estimated Annual Output4,860 kWh
Annual Consumption (Assumed)2,150 kWh
Self-Consumption (PV Only)778 kWh
Self-Sufficiency (PV Only)36%


25-Year Financial Summary

Net Present Value (NPV)£10,313.97
Discounted Payback Period8–9 Years
Internal Rate of Return (IRR)13%

Understanding the Financial Metrics

Net Present Value (NPV): NPV represents the value today of all future energy savings, minus the installation cost. Because future money is worth less due to inflation, all savings are discounted. A positive NPV means the investment is financially beneficial — the higher the NPV, the better the long-term return.

Discounted Payback Period: This measures how long the system takes to pay for itself after accounting for inflation and the time value of money. It is more accurate than “simple payback” and gives a realistic expectation of financial performance.

Internal Rate of Return (IRR): IRR is the percentage return on investment across 25 years. A higher IRR indicates a more profitable installation when compared to traditional savings accounts, bonds and ISAs.



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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With hundreds of five-star reviews since 2006, Sustainable Energy Engineering has built a reputation for quality, honesty, and reliability. Unlike many short-lived installers, we're here for the long haul - ready to support you long after installation. That's why so many customers choose us after their original installer disappears. Choose us for peace of mind, fair pricing, and expert solar solutions that last.