Cut Your Energy Bills - Start Today.

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

CALL 0191 340 7001

Mr Haigh – Newcastle Solar & Battery Installation

6kW Solar PV System with Fox ESS EP12 Battery Storage

Sustainable Energy Engineering Ltd installed a high-efficiency 6kW solar PV system with a Fox ESS EP12 battery for Mr Haigh in Newcastle. The customer wanted to dramatically reduce reliance on grid electricity while also supporting an electric vehicle charging setup without unintentionally draining the household battery.

To achieve this, we installed a dedicated EV distribution board that prevents EV charging from pulling energy from the home battery — ensuring stored energy is prioritised for home use.

With a large 10.36kWh usable battery capacity, this system allows substantial overnight storage using off-peak tariffs and delivers strong solar performance during the day. Combined with a bird exclusion kit and high-output JA Solar modules, this installation provides long-term reliability and excellent financial return.

Technical Information:

Solar Panel Model:JA Solar 500W
Number of Panels:12
Inverter:Fox ESS 6kW Hybrid
Battery Storage:Fox ESS EP12 (10.36kWh / 9.32kWh usable)
Mounting System:Renusol Roof Mounting Kit
Additional Components:Bird Exclusion Kit, EV Distribution Board, AC Isolators, Generation Meter


Installation Data

Installed Capacity6 kWp
Orientation45° from South
Inclination30°
Postcode Region9E
Kk Value844
Shade Factor1.00
Estimated Annual Output5,060 kWh
Self-Consumption (PV Only)1,899 kWh
Grid Independence (PV Only)35%
Usable Battery Storage10.36 kWh
Self-Consumption (PV + Battery)4,066 kWh
Grid Independence (PV + Battery)74%


25-Year Financial Summary

Net Present Value (NPV)£26,695.23
Discounted Payback Period7–8 Years
Internal Rate of Return (IRR)17.5%

Net Present Value (NPV): NPV measures the value today of all future financial benefits produced by the solar system, minus the original investment. A positive NPV — such as £26,695.23 — means the system is forecast to generate more financial value than it costs, making it a strong investment.

Discounted Payback Period: This represents how long it takes for the solar system to “pay for itself” after accounting for inflation and the time value of money. A 7–8 year discounted payback is considered an excellent return for a domestic system of this size.

Internal Rate of Return (IRR): IRR shows how efficient the investment is over 25 years. A 17.5% IRR significantly outperforms most savings accounts, ISAs, and traditional investments, demonstrating high long-term value.



Project Gallery:

Cut Your Energy Bills - Start Today.

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

CALL 0191 340 7001


View more of our solar case studies.

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.

Ready to switch to solar? Request a quote.

To design and size your solar and/or battery system correctly, we need to know your annual kWh usage. This allows us to create a system that accurately matches your energy needs - reducing the electricity you buy from the grid, lowering your carbon footprint, and protecting you from rising energy costs so you save as much money as possible.

Rated best in North England by the Independent.


Independent Logo

"Sustainable Energy Engineering is based in North England and offers a comprehensive solar panel installation service. The family-run business has more than 20 years of experience and is TrustMark registered, which means homeowners who are taking advantage of the UK's solar incentives can use Sustainable Energy Engineering as their certified installed."


Meet the Team


Your local trusted solar panel installer.

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.