Powering Change

Installing since 2010 · 0118 951 4490 · info@spiritenergy.co.uk

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'No hesitation in recommending Spirit Energy'

 -Peter Dennis, Managing Director, Philip Dennis Foodservice

'Superior level of technical design'

-Sam, Berkshire Homeowner

'Installation was better than seamless'

 -Giles Owen, Operations Director, Hansgrohe UK

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Spirit Energy is one of the most experienced solar and battery installers in the South of England, specialising in the bespoke design and installation of solar and battery storage systems. Founded in 2010, we have installed over 6,000 solar and battery systems, helping homeowners and businesses save millions on electricity bills, become energy independent, and cut their carbon footprints.

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Design your own solar & battery storage system using our free online calculator

In 2016, Spirit Energy developed the first free online solar calculator, enabling homeowners and business owners to design their own solar and battery storage systems without needing to contact an installer.

The tool is highly flexible. You can design a system with both solar and battery storage, or just one technology, and see how it would perform alongside heat pumps and electric vehicles. It also allows you to compare potential savings across a range of electricity tariffs.

While our solar and battery calculator is a great starting point, nothing matches the accuracy and value of a bespoke quotation from Spirit Energy’s highly trained specialists. Every part of your project is handled in-house — from design and engineering through to installation and aftercare — ensuring the highest standards at every stage. Get in touch with us for a free, no obligation quote.

Why Choose Spirit Energy?

Spirit was founded by Erica Charles, a mathematician who returned to Oxford in her 30’s to complete a Masters on the maximisation of photon capture by solar panels. Anyway, the maths taught her that a well-designed and well-installed solar system will generate a considerably superior return on investment compared to one where insufficient attention has been applied to the design details.

That ethos continues today with Spirit’s commitment to recruiting the finest engineers and installers and providing them with the best in-house technical training that the industry can offer… regardless of the cost…

-Ian Charles, Financial Director

Established 2010 - Spirit Energy35 Staff - Spirit Energy100% In-House Installation & Design Team - Spirit Energy136 Years of Combined Experience - Spirit EnergyFamily Business - Spirit Energy

Ian Charles - Financial Director - Spirit Energy - Compressed - Cropped 2

Ian Charles        Financial Director

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How to learn more

Vishal Giga
Operations Director

Joined Spirit in 2010

Vishal joined Spirit Energy a few months after Erica and Ian founded the business in 2010 as a project manager, and is now our Operations Director. All of our project managers and installers are in-house, and Vishal oversees them all and is in charge of making sure that every project goes smoothly and is installed on time. Vish has a wealth of experience with both commercial and residential projects, and directly manages every commercial project that we do, including our installations at Philip Dennis Foodservice in April 2024, and Hansgrohe's headquarters in September 2024.

Justin Parsons
Head of Installations

Joined Spirit in 2010

Justin is the backbone of the company and part of the leadership team. He has overall responsibility for the installers, electrical design and sign off of all systems as well doing a technical and structural survey for every project to ensure we can manage each job perfectly. His devotion and meticulous attention to detail has helped build Spirit into the reputable and trustworthy brand we are today. 

You will most likely meet Justin on your technical & structural survey where he will plan your entire installation and run you through every minute detail. 

"My ultimate goal is to ensure our operations run smoothly, delivering exceptional customer service and top-quality installations to every customer, domestic or commercial."

-Vishal Giga, Operations Director

"I know that the technical & structural survey is a step that other installers don't feel is necessary, but many of Spirit's customers appreciate the chance to talk to the actual installers before the installation date."

-Justin Parsons, Head of Installations

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Some of our Commercial Case Studies

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Latest Case Study

Wentworth Lodge - 28.35 kWp (Apr '25)

 

Introduction

Wentworth Lodge, part of the B&M Investments group, has taken a meaningful step towards sustainability by installing solar panels across its site. The project is designed to reduce energy costs while cutting the building’s carbon footprint, ensuring long-term benefits for both residents and the wider community.

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Latest Blog

How Many Solar Panels Can I Fit on My Roof?

Posted by Alicja Kopinska on 12 Sep 2025

If you want a quick, reliable answer, there are four ways to size a roof for solar: satellite measuring, measuring from architectural plans, measuring in person, and drone survey. Below we go into detail about each method to answer the question how many solar panels you can fit on your roof. Read this blog if you want more than a rough guess.

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Some Products We Work With

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We've installed thousands of systems since 2010, helping to make buildings across the South of England more energy efficient, as well as helping people save money and reduce reliance on the grid.

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