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Mr A - 6.4kWh

On-site solar usage
before battery: 62%

On-site solar usage
after battery: 92%




In October 2016, Spirit commissioned a 6.4 kWh Tesla Powerwall lithium ion battery to complement the 4 kWp of solar panels installed on the roof.

Before the installation of the battery on-site usage of solar PV was approximately 62%. After the installation it has been measured at around 92%. In-depth monitoring is available via a meter which measures electricity flow to and from the battery, solar PV and grid.

This was Spirit’s first Tesla Powerwall installation, following several other successful battery systems. It is a DC-coupled system which means it connects directly to the PV inverter and is the most efficient way to install a battery to a PV system.

“I could not recommend Spirit Solar enough. Highly professional and skilful team. Installing my Powerwall in October was very exciting and so wanted it done to high standard. Spirit Solar did exactly that, the finished installation exuded care and pride in their work. I had no hesitation in putting my name forward as a very satisfied client.”

Sparsholt & Andover College - 633kWp (September 2015 - February 2016)




Panel Model: 2500 x BenQ 250/260W
Inverter Models: 29 Zeversolars
System Size: 633 kWp in total, over 20 buildings
Annual Output: 570,000 kWh
Annual Benefits: £150,000
Annual CO2 Reduction: 317.3 tonnes

From September 2015 to February 2016 Spirit installed and commissioned Solar PV systems for 20 buildings spread out over Andover College, and Sparsholt College near Winchester. The arrays ranged from 32 to 400 panels on each roof. These all contributed to a total of over 2,500 BenQ 250W and BenQ 260W panels.

It was the largest educational solar PV installation in the UK at the time of writing.


The system was funded by GreenNation, so they have paid the full costs of installation. They benefit from the Feed-In tariff and Export tariff payments, and sell the electricity to Sparsholt and Andover College at a reduced rate. Sparsholt and Andover College benefit from the cheap electricity.

The system was preaccredited so all systems could benefit from the higher 2015 Feed-In Tariff rate.

Mr A - 6.4kWh

With batteries:

Annual usage supplied by solar: 78%
Electricity used on site supplied by solar: 2,345 kWh
Estimated annual use of electricity: 3,000 kWh



Without batteries:

Annual usage supplied by solar: 43%
Electricity used on site supplied by solar: 1,281 kWh
Estimated annual use of electricity: 3,000 kWh

In May 2016, Spirit commissioned a 6.4 kWh LG Chem lithium ion battery, with a Solax Hybrid inverter/charger to complement the 4 kWp of solar panels installed on the roof.

With a battery, the annual usage supplied by solar to the property is expected to be around 78%, delivering greatly increased electricity savings.

This was the first ever home battery system to be fully approved by SSE!


We are proud to have been at the forefront in getting the DNO (distribution network operator – SSE) to adapt to a new way of thinking and approve the safety of our product before they are installed in homes across the UK . Unlike Solar PV there is no regulatory body to protect consumers, some companies haven’t even bothered to contact the grid – which could prove costly for the home-owner left with a product not fit for purpose.

This represents a step towards de-centralised power in the form of micro generation and power storage will become the future for home owners at a time when grid independence is to become an advantage.

Dolphin Retail Park (Morgan Sindall) - 103kWp (March 2016)






Panel Model: 411 x BenQ 250W
Inverter Models: 4 x Zeversolar Eversol TLC 20K, 1 x Zeversolar Eversol TLC 17K
System Size: 103 kWp in total, over 4 units
Annual Output: 89,804 kWh
Annual Benefits: £10,790
Annual CO2 Reduction: 46.6 tonnes

In March 2016 Spirit was contracted by Morgan Sindall to install 103kWp of solar PV over 4 units at Dolphin Retail Park in Salisbury. The larger unit 4 comprises of 168 panels, while the smaller units 2 & 3 comprise of 84 panels each, and unit 1 comprises of 75 panels. This led to a total of 411 x BenQ 250W panels.

Horspath Depot - 50kWp (March 2016)

Panel Model: 192 x BenQ 260W
Inverter Models: 1 x Zeverlution Pro 33K, 1 x Zeversolar Eversol TLC 10K
System Size: 50kWp
Annual Output: 41,533 kWh
Annual Benefits: £6,057
Annual CO2 Reduction: 21.6 tonnes

In March 2016 Spirit was contracted by Oxford City Council to install 50kWp of solar PV at Horspath Depot in Oxford. This particular system comprised of 192 x BenQ 260W panels mounted on clenergy EZ-rack. The system is expected to generate 41,533 kWh per year saving 21.6 tonnes of CO2 annually with payback period of 7 years.

Dr R- 3.84kWh

With batteries:

Annual usage supplied by solar: 66%
Electricity used on site supplied by solar: 2,103 kWh
Estimated annual use of electricity: 4,500 kWh



Without batteries:

Annual usage supplied by solar: 47%
Electricity used on site supplied by solar: 2,968 kWh

In July 2016, Spirit commissioned a 3.84 kWh North Star Blue lead acid battery, with a Victron inverter/charger to complement the 8 kWp of solar panels installed on the roof.

With a battery, the annual usage supplied by solar to the property is expected to be around 66%, delivering greatly increased electricity savings.

This was the second ever home battery system to be fully approved by SSE!


This system was retrofitted to an existing solar PV installation using an AC-coupled battery which meant it was very easy and affordable to install.

The Victron inverter/charger is extremely flexible so that when the batteries need replacing it won’t be very costly because the rest of the equipment will remain functional.

The system can also be reconfigured in the future to provide backup from power cuts if that starts to become a problem.

Claude Fenton – 250 kWp (September 2014)

Panel Model: 998 x Renesola 250W
Inverter Model: 8 x PowerOne TRIO-27.6-TL, 1 x PowerOne PVI-10.0-TL
System Size: 249.5 kWp
Annual Output: 235,449 kWh
Annual Benefits: £46,029
Annual CO2 Reduction: 134.3 tonnes


In September 2014 Spirit commissioned a 249.5kWp ground-mounted system for Claude Fenton Holdings in Reading. This particular system comprised of 998 x Renesola panels. The system is expected to generate 235,449 kWh per year saving 134.3 tonnes of CO2 annually with payback period of 6 years.

Tandem Group - 250 kWp (Jan 2014)

Panel Model: 999 x Renesola 250W
Inverter Model: Aurora PowerOne
System Size: 250 kWp
Annual Output: 202,174 kWh
Annual Benefits: £42,000




In January 2014 Spirit designed,installed and commissioned a 250 kWp roof system for the Tandem group.This particular system comprised of 999 x Rene Sola panels mounted on clenergy EZ-rack. The system is expected to generate 202,174 kWh per year saving 126 tonnes of CO2 annually with payback period of less than 6 years.

"It is early days but we are delighted with the system performance so far. We expect the project to deliver long term financial savings for the Group. In addition, the implementation of a solar solution forms part of our environmental and social responsibility strategy and we are therefore pleased to have the system installed and generating electricity. The installation process itself was pain free and efficiently carried out by Spirit Solar. All issues were promptly resolved and we would have no hesitation in recommending them”

Marwell Zoo - 21.49kWp (September 2015)

Panel Model: 75 x JA Solar 250W + 22 GBSol live triangles (of varying power)
Inverter Model: 1 x SMA STP20000TL, 1 x SMA SB4000TL
System Size: 21.49 kWp
Annual Output: 21,000 kWh
Annual Benefits: £4,081
Annual CO2 Reduction: 11.8 tonnes


In September 2015 Spirit commissioned a 21.49 kWp roof mounted system for Marwell Zoo. The integrated system comprised of 75 JA Solar panels as well as 22 GBsol Live Triangles which is set to generate an annual benefit of £4,081.

The system’s unique integrated panels are an example of Spirit Solar’s innovation and versatility in mounting solutions.

Leybourne Grange (Taylor Wimpey) - 45.75kWp (2015/2016)






Panel Model: 183 x Shinetime 250W
Inverter Models: Omnik
System Size: 45.75 kWp in total
Annual Output: 47,450 kWh
Annual Benefits: £5,000
Annual CO2 Reduction: 26.6 tonnes

In 2015/2016 Spirit Solar installed solar panels on 34 new-build plots, and 5 apartment blocks for Taylor Wimpey in Leybourne Grange, Kent. The plots had 3 panels on each roof, whilst the apartments ranged from 9 to 21 panels on each block. These all contributed to a total of 183 Shinetime 250W panels.

These installations used a roof-integrated mounting system to fix the panels so they were completely flush with the roof. The panels are in place of the tiles that would normally be there while remaining completely weather-proof.

Installation took place around the building schedule, with two plots being installed per day. The systems were commissioned with minimal disruption to the ongoing works.

These PV systems are eligible for both the feed-in and export tariffs from which the residents will benefit. This, along with electricity savings, leads to total estimated income and savings of £5,000 per year.
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