Real projects, real results

Our Case Studies

Real installations from across Wiltshire and the South West. Every project detailed with system specs, challenges overcome, and measurable results.

8
Projects shown
40.2 kW
Total capacity
£6,230+
Annual savings
8,303 kg
CO2 saved/year
MCS Certified NICEIC Approved RECC Member 0% VAT Until Mar 2027 50+ Verified Reviews MCS Certified NICEIC Approved RECC Member 0% VAT Until Mar 2027 50+ Verified Reviews
Solar PV September 2025

3.6kW Solar on a Grade II Listed Property in Bath

Bath, Somerset (BA1) · Grade II listed Georgian townhouse

Challenge

Listed Building Consent required detailed heritage impact assessment. The conservation officer required all-black panels invisible from any public viewpoint. The rear roof had partial shading from a neighbouring chimney stack.

Solution

We prepared a comprehensive Listed Building Consent application with photomontages and heritage impact statement. Sigenergy optimisers on each panel compensated for partial shading. All-black panels on the rear slate roof are completely invisible from street level.

Result

Consent granted on first application. The system generates 3,528 kWh annually despite the shading, covering approximately 85% of the household electricity needs. Zero visual impact from the street.

We were told by two other installers that solar was not possible on a listed building. Matt handled the entire consent process and the installation is invisible from the road. Exceptional service.

C. Hartley, Bath, Somerset

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System Specifications

System size 3.6 kW
Panels 8 x JA Solar 450W All-Black
Inverter Sigenergy SE3680H
Roof type Natural slate (rear elevation)
3,528 kWh
Annual generation
£720
Annual saving
Solar PV October 2025

4kW Solar in a Bradford on Avon Conservation Area

Bradford on Avon, Wiltshire (BA15) · Victorian stone cottage

Challenge

The property sits within a conservation area, meaning panels visible from a highway could require planning permission. The stone slate roof required careful handling to avoid damage. Partial shading from mature trees affected the western portion of the rear roof.

Solution

All panels installed on the rear roof slope, invisible from the street — within permitted development rights. We used slate-specific hooks designed for stone slates with foam gaskets to prevent cracking. Sigenergy panel-level optimisers handle the partial shading without affecting the rest of the array.

Result

No planning application required — rear-only installation is permitted development even in conservation areas. The system generates 3,920 kWh annually despite partial shading. The homeowner saves approximately £850 per year with a 7-year payback.

We live in a conservation area and assumed solar was off the table. Lumos explained the rules clearly, kept everything on the rear roof, and there was no planning application needed at all. The system looks smart on the stone slates.

A. Turnbull, Bradford on Avon, Wiltshire

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System Specifications

System size 4 kW
Panels 10 x JA Solar 400W All-Black
Inverter Sigenergy SE4000H with optimisers
Roof type Natural stone slate
3,920 kWh
Annual generation
£850
Annual saving
Solar, Battery & EV Charger November 2025

6kW Solar, Battery & Zappi EV Charger in Chippenham

Chippenham, Wiltshire (SN14) · 5-bed detached

Challenge

The natural slate roof required specialist mounting hooks. Two EVs meant significant charging demand — approximately 8,000 kWh per year combined.

Solution

A 6kW array using slate-specific hooks with careful handling to avoid cracking. Zappi EV charger configured for solar divert mode — prioritising free solar electricity before drawing from the grid. The 10kWh battery handles evening household loads.

Result

The family now charges both EVs primarily from solar during spring through autumn, saving approximately £900/year on fuel alone. Combined with household savings, the total system saving exceeds £1,600 annually.

Having both cars charge from the roof while we are at work is incredible. The Zappi app shows exactly how much free solar is going into the car. Our petrol costs have dropped to near zero.

J. Whitfield, Chippenham, Wiltshire

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System Specifications

System size 6 kW
Battery 10 kWh
Panels 14 x JA Solar 425W All-Black
Inverter Sigenergy Gen3 6kW Hybrid
Battery unit Sigenergy All-in-One 10.2kWh
Roof type Natural slate
5,880 kWh
Annual generation
£1,650
Annual saving
Battery Retrofit February 2026

Retrofit 10kWh Battery to Existing Solar in Corsham

Corsham, Wiltshire (SN13) · 3-bed semi-detached

Challenge

The existing string inverter was incompatible with battery storage. The original installer had ceased trading. The homeowner had no maintenance support and limited understanding of their system performance.

Solution

We replaced the existing inverter with a Sigenergy hybrid unit (compatible with the existing panels) and added a 10kWh battery in the garage. We also fixed two panels that had developed bypass diode faults — reducing output by approximately 15%.

Result

Self-consumption jumped from 35% to 83%. The fixed panels restored 15% of lost generation. Combined, the homeowner now saves an additional £580 per year. We also enrolled them in our annual service plan.

Lumos took over aftercare from our previous installer who had gone bust. They found faults we did not know we had and the battery has made the whole system work so much harder. Wish we had found them years ago.

L. Cooper, Corsham, Wiltshire

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System Specifications

System size 4 kW (existing)
Battery 10 kWh
Panels Existing 4kW array (installed 2019 by another company)
Inverter Replaced with Sigenergy Gen3 5kW Hybrid
Battery unit Sigenergy All-in-One 10.2kWh
Roof type Concrete tiles (existing panels)
Existing system
Annual generation
£580
Annual saving
Solar & Battery March 2026

8kW Solar & 16kWh Battery in Devizes

Devizes, Wiltshire (SN10) · Barn conversion with annex

Challenge

Very high electricity consumption across main house and annex. The owner works from home running servers and workshop equipment. Monthly bills exceeded £350.

Solution

The standing seam roof allowed clamp-on mounting with zero penetration — the fastest and cleanest install method. An 8kW array with stacked 16kWh battery storage to handle the high base load. Smart scheduling charges the battery overnight at 7.5p/kWh on Octopus Go.

Result

Monthly bills dropped from £350+ to approximately £80. The combination of solar generation, battery storage, and time-of-use tariff optimisation saves over £2,100 annually. Estimated payback: 5.5 years.

The standing seam installation was incredibly clean — no drilling into the roof at all. With the battery and Octopus Go, we have cut our bills by 77%. Best investment we have ever made.

D. Marsh, Devizes, Wiltshire

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System Specifications

System size 8 kW
Battery 16 kWh
Panels 18 x JA Solar 445W All-Black
Inverter Sigenergy Gen3 8kW Hybrid
Battery unit Sigenergy 16.4kWh (stacked)
Roof type Standing seam metal
7,840 kWh
Annual generation
£2,100
Annual saving
Solar & Battery January 2026

4.2kW Solar & 10kWh Battery in Melksham

Melksham, Wiltshire (SN12) · 4-bed detached

Challenge

The south-facing roof had a dormer window reducing available space. The family used most electricity between 5pm and 10pm when solar generation had stopped.

Solution

We designed a 10-panel array around the dormer, maximising the available south-facing area. A 10kWh Sigenergy battery stores daytime surplus for evening use. The hybrid inverter manages solar, battery, and grid automatically.

Result

Self-consumption increased from an estimated 35% (solar only) to 82% with the battery. Monthly bills dropped from £185 to approximately £45. The system paid back the battery cost within 14 months of additional savings.

Matt designed the system around our dormer beautifully — you would not know the panels were split into two sub-arrays. The battery has been transformative for our evening usage.

R. Chapman, Melksham, Wiltshire

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System Specifications

System size 4.2 kW
Battery 10 kWh
Panels 10 x JA Solar 420W All-Black
Inverter Sigenergy Gen3 5kW Hybrid
Battery unit Sigenergy All-in-One 10.2kWh
Roof type Concrete interlocking tiles
4,116 kWh
Annual generation
£1,180
Annual saving
Solar, Battery & EV Charger April 2026

5.4kW Solar, Battery & EV Charger on a New Build in Swindon

Swindon, Wiltshire (SN2) · 4-bed new build detached

Challenge

New build warranty considerations meant scaffolding had to be erected without contacting the property walls. The house was on an estate with a restrictive covenant requiring dark or all-black panels only.

Solution

Free-standing scaffolding erected to protect the NHBC warranty. All-black AIKO Neostar panels satisfy the estate covenant. A Zappi EV charger was installed in the garage with solar divert mode, and a 10kWh battery captures surplus generation for evening use.

Result

The system generates 5,292 kWh annually from the ideal south-facing roof. With battery storage and EV charging from solar, the family saves approximately £1,480 per year. The estate management company approved the installation without issue.

We were disappointed the developer did not offer solar with our new home. Lumos made the whole process easy — they even handled the estate management approval. Both cars now charge from the roof.

M. Collins, Swindon, Wiltshire

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System Specifications

System size 5.4 kW
Battery 10 kWh
Panels 13 x AIKO Neostar S+ 415W
Inverter Sigenergy Gen3 6kW Hybrid
Battery unit Sigenergy All-in-One 10.2kWh
Roof type Concrete interlocking tiles
5,292 kWh
Annual generation
£1,480
Annual saving
Solar & Battery December 2025

5kW Solar & Battery on a Flat Roof Extension in Trowbridge

Trowbridge, Wiltshire (BA14) · 3-bed semi-detached with flat roof extension

Challenge

The pitched roof had an east-west orientation giving reduced yield. The flat-roof extension had good southern exposure but required specialist mounting frames and membrane protection to avoid voiding the EPDM rubber roof warranty.

Solution

We installed 8 panels on the flat roof using ballasted tilt frames angled at 15 degrees for optimal generation without penetrating the membrane. The remaining 4 panels were placed on the east-facing pitched roof to capture morning sun. A 10kWh battery maximises self-consumption.

Result

The split array approach generates 4,900 kWh annually — more than a pure east-west pitched installation would have achieved. Self-consumption with battery is 79%. Bills dropped from £165/month to approximately £40.

Two other companies said our roof was not suitable. Lumos found a way to use both our flat roof and the east pitch together. The generation is better than we expected.

S. Pearce, Trowbridge, Wiltshire

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System Specifications

System size 5 kW
Battery 10 kWh
Panels 12 x JA Solar 420W All-Black
Inverter Sigenergy Gen3 5kW Hybrid
Battery unit Sigenergy All-in-One 10.2kWh
Roof type Flat roof (EPDM) + pitched concrete tiles
4,900 kWh
Annual generation
£1,340
Annual saving
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