How JM Renewable Solutions fitted a garage-mounted solar array and two Tesla Powerwall 3 batteries to a modern detached property in the village of Llanrhaeadr, giving the homeowner a fast payback and greater energy independence.
At a Glance
Location: Llanrhaeadr, Denbigh
Property Type: A modern home on a newer village development
Systems Size: Additional 8 panel, 3.6kW solar PV system on the garage and two Tesla Powerwall batteries
MEET THE HOMEOWNER
Mr Watkin lives in a modern home on a newer development in the village of Llanrhaeadr, near Denbigh.
“We’d already seen the benefits from our existing solar system, so the garage roof felt like an obvious next step. Adding more panels there, along with batteries to capture more of the energy we’re generating, meant we could make the most of that roof space and bring our bills down even further.” Like many homeowners exploring solar for the first time, Mr Watkin wanted to understand exactly what his roof could deliver before committing.”
THE BRIEF
JM Renewables carried out a full technical assessment of the property, to design a system suited to the home. The detached garage roof was identified as the best location for the array, offering more usable space than the main house roof.
“We decided to install 8 panels on the garage to maximise our properties renewable potential. We then decided to install two Tesla batteries to store cheap green electricity and any excess I can be sold back to the grid!”
THE SOLUTION
Based on the survey, JM Renewables designed and installed a complete solar and storage system on the garage roof:
4.5kW Solar Array
8 x 450W Trina Vertex solar panels, arranged across two rows on the garage roof
3.6kW Solis single-phase inverter
GSE in-roof mounting kit
Estimated annual generation of 3,300kWh in year one
Tesla Powerwall 3 Battery Storage
2 x 13.5kWh Tesla Powerwall 3 with gateway
Stored surplus solar generation during the day for use in the evening and overnight
Reduces reliance on grid electricity at peak-rate times
INSTALL REVIEW
“The team from JM Renewables were good from the start working through ideas and installed the system promptly on the days scheduled. The solar panel installation by Glyn went smoothly and then Gareth and Dylan came to install batteries. Their work was excellent and very tidy. Looking forward to seeing how well the system works.”
25-YEAR FINANCIAL PROJECTION
The full generation and saving projection for the installed 3.6 kW system is set out below.
| Year | Estimated Annual Generation (kWh) | Elec. Cost (p/kWh) | Annual Saving* |
|---|---|---|---|
| 1 | 4,143 | 0.250 | £1,036 |
| 5 | 4,053 | 0.304 | £1,231 |
| 10 | 3,942 | 0.388 | £1,529 |
| 15 | 3,835 | 0.495 | £1,898 |
| 20 | 3,731 | 0.632 | £2,357 |
| 25 | 3,629 | 0.806 | £2,926 |
Total financial benefit over 25 years: £45,674. This does NOT include this additional savings from the two Tesla Powerwall Batteries.
Together with the two Tesla Powerwall 3 batteries, the system also cuts down how much of that generation Mr Watkin needs to export or waste, by storing surplus daytime solar for use once the sun goes down.
ENVIRONMENTAL IMPACT
The installation saves approximately 1.08 tonnes of CO2 annually, an equivalent to planting 49 trees every year.
“Knowing we’re cutting over a tonne of CO2 every year, and that’s on top of what our first system already saves, makes the investment feel worthwhile beyond just the bill savings.”
PEACE OF MIND
The system is backed by:
25-year warranty on the PV panels
30-year linear performance warranty
10-year warranty on the mounting system
10-year guarantee on JM Renewables’ workmanship
5-year inverter warranty
10-year warranty on the x2 Tesla Powerwall 3 batteries
TECHNICAL SUMMARY
| Component | Specification |
|---|---|
| Solar PV | 8 x Trina Vertex 450W panels (3.6kW system) |
| Location | Detached garage roof |
| Inverter | Solis 3.6kW, single phase |
| Mounting | GSE in-roof mounting kit |
| Battery storage | X2 Tesla Powerwall 3, 13.5kWh with gateway |
| Annual generation | 3,300 kWh |
| Annual CO2 saved | 1.08 tonnes |
CONSIDERING SOLAR FOR YOUR OWN HOME?
Every property is different — roof orientation, available space and existing construction all affect what a system can deliver. As with Mr Watkin’s home, we’ll survey your property, model more than one option where it helps, and set out the real numbers before you decide.
[Book your free home survey →]
Or call us on 01244 555141 to chat through your options.
