Mr Irving – Northumberland Solar Installation

9.5kW Solar PV with Fox ESS EP11 Battery Storage

Sustainable Energy Engineering Ltd supplied and installed a high-performance 9.5kW solar PV system for Mr Irving in Northumberland. The system combines premium JA Solar 500W panels with a robust Fox ESS KH8 hybrid inverter and a 10.36kWh EP11 battery module.

This setup allows for exceptional daytime generation and strong overnight coverage thanks to the storage capacity. Designed with futureproofing and efficiency in mind, this system significantly reduces grid reliance and offers long-term bill savings.

MCS Sunpath Diagram

The Sunpath Diagram illustrates how nearby obstructions (chimneys, trees, neighbouring buildings) affect annual solar production. Each shaded block represents approximately 1% loss due to shading. This property displayed minimal shading, contributing to a high annual yield.

Technical Information

Solar Panel Model	JA Solar 500W
Number of Panels	19
Inverter	Fox ESS KH8 Hybrid Inverter
Battery Storage	Fox ESS EP11 (10.36kWh / 9.32kWh usable)
Mounting System	Renusol Roof Mounting Kit
Additional Components	Bird Mesh, AC Isolators, Generation Meter

Installation Data

Installed Capacity	3.5 kWp + 6 kWp
Orientation	155° & 25°
Inclination	25°
Postcode Region	9E
Kk Values	570 & 866
Shade Factor	0.99
Estimated Annual Output	7,120 kWh
Annual Consumption (Assumed)	3,675 kWh
Self-Consumption (PV Only)	1,392 kWh
Self-Sufficiency (PV Only)	38%
Usable Battery Capacity	9.32 kWh
Self-Consumption (PV + Battery)	2,506 kWh
Self-Sufficiency (PV + Battery)	79%

25-Year Financial Summary

Net Present Value (NPV)	£27,914.44
Discounted Payback Period	7–8 years
Internal Rate of Return (IRR)	16.5%

Understanding the Financial Metrics:

Net Present Value (NPV): NPV represents the value today of all future financial benefits from your solar investment. A positive NPV means the system returns more value over its lifetime than it costs — a clear indicator of a strong financial investment.

Discounted Payback Period: This measures how long it takes for the system to pay for itself once inflation and future value of money are taken into account. Solar systems typically show longer discounted paybacks than simple payback, but far more accurate real-world projections.

Internal Rate of Return (IRR): The IRR indicates the long-term profitability of the investment. At 16.5%, this is significantly higher than most savings accounts, ISAs, or low-risk financial products — making solar a strong long-term asset.

Project Gallery:

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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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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.

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"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."

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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.

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