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Solar & Renewables

MCS certified renewable energy engineers for solar PV, battery storage, and heat pump installations, repairs and servicing across Cornwall and Devon.

About This Service

Renewable Energy for Homes & Businesses

Cornwall and Devon are among the best regions in the UK for renewable energy. With above-average sunshine hours and an increasing number of properties moving away from fossil fuels, there has never been a better time to invest in solar, battery storage, or a heat pump system. NJG Construction connects you with MCS certified renewable energy engineers who understand the unique requirements of properties in the South West.

Whether you need a new solar PV array designed and installed, a faulty inverter replaced, or an air source heat pump serviced before winter, our engineers carry out every job to MCS standards. This certification is essential if you want to access government incentives such as the Boiler Upgrade Scheme grant, and it ensures your installation is properly registered and warrantied.

We also support landlords and commercial property owners looking to reduce energy costs and improve EPC ratings. From small domestic rooftop systems to larger commercial solar installations, our network of qualified engineers covers the full spectrum of renewable technology currently available in the UK market.

What We Cover

Renewable Energy Services

Solar PV Repair

Diagnosis and repair of underperforming solar panel systems, including micro-crack detection, bypass diode replacement, and connection faults that reduce output.

Inverter Faults

Replacement and repair of string inverters and micro-inverters. We work with all major brands including SolarEdge, Enphase, GivEnergy, and Solis to restore your system quickly.

Battery Storage

Installation of home and commercial battery systems to store excess solar energy for use in the evening or during power cuts. We install GivEnergy, Tesla Powerwall, and more.

Air Source Heat Pumps

Installation, servicing, and repair of air source heat pumps. Eligible for up to £7,500 through the Boiler Upgrade Scheme when installed by our MCS certified engineers.

Ground Source Heat Pumps

Ground source heat pump installation and maintenance for properties with sufficient land. Highly efficient systems that extract heat from the earth all year round.

Solar Panel Maintenance

Scheduled cleaning, inspection, and performance monitoring to keep your solar array operating at peak efficiency. Recommended annually, especially in coastal areas prone to salt build-up.

Solar Thermal

Installation and repair of solar thermal panels for hot water heating. An effective solution for reducing gas or oil usage in properties across the South West.

MCS Certification

All our renewable energy installations are completed by MCS certified engineers, ensuring compliance with industry standards and eligibility for government grants and incentives.

How It Works

Step 1

Raise your job

Tell us what you need — whether it is a new solar installation, a heat pump service, or an inverter fault. Submit online, call, or WhatsApp us.

Step 2

Quote & deposit

We provide a clear, detailed quote. For larger installations we may arrange a site survey first. Once approved, we schedule the work at a time that suits you.

Step 3

Work completed & reviewed

Your engineer completes the installation or repair with full MCS documentation and certification. You can track progress online and leave a review when done.

Common Questions

Solar & Renewables FAQs

How much can I save with a heat pump compared to a gas boiler?
The savings depend on your current heating system and property insulation, but most households switching from a gas boiler to an air source heat pump see a reduction in heating costs of around 20 to 40 percent. Heat pumps are particularly effective in well-insulated homes and properties with underfloor heating. For homes currently using oil or LPG — which is common in rural Cornwall and Devon — the savings can be even more significant, often exceeding 50 percent on annual fuel bills.
How much electricity will a solar PV system generate in Cornwall?
Cornwall is one of the best locations in the UK for solar energy. A typical 4kW domestic system with south-facing panels can generate between 3,800 and 4,200 kWh per year in Cornwall, which is enough to cover the electricity needs of an average household. Actual output varies depending on roof orientation, pitch, shading, and panel quality. Our engineers carry out a full assessment before installation to give you an accurate generation estimate for your specific property.
Am I eligible for the Boiler Upgrade Scheme grant?
The Boiler Upgrade Scheme (BUS) offers grants of up to £7,500 towards the cost of an air source heat pump or ground source heat pump. To qualify, your property must be in England or Wales, have a valid EPC with no outstanding recommendations for loft or cavity wall insulation, and the installation must be carried out by an MCS certified installer. All our heat pump engineers hold MCS certification, so we handle the grant application as part of the installation process.
How often do solar panels need maintenance?
Solar panels require very little maintenance, but an annual inspection and clean is recommended to maintain optimal performance. In coastal areas of Cornwall and Devon, salt spray and gull droppings can reduce output more quickly than in inland areas, so we recommend cleaning at least once a year. We also check all electrical connections, mounting brackets, and inverter performance during a service visit to catch any issues before they affect your generation.
How much does a solar PV installation cost?
A typical 4kW domestic solar PV system costs between £5,000 and £7,000 installed, depending on the panel brand, roof type, and any additional work required such as scaffolding. Adding a battery storage system typically adds £2,500 to £5,000 depending on capacity. We provide a fixed, all-inclusive quote after survey so there are no surprises. With current electricity prices, most systems pay for themselves within six to eight years.
Can I get a battery installed with my existing solar panels?
Yes. Battery storage can be retrofitted to most existing solar PV systems. We install hybrid inverters or AC-coupled battery systems that work alongside your current setup. This allows you to store excess daytime generation for use in the evening, reducing how much electricity you buy from the grid. Our engineers will assess your current system and recommend the best battery solution for your needs and budget.

Ready to Go Renewable?

Whether you need a new solar installation, a heat pump service, or a repair to an existing system, our MCS certified engineers are ready to help across Cornwall and Devon.

Raise a Job 07915 357552

Raise a Renewables Job

Fill in the form and we will match you with an MCS certified renewable energy engineer. Whether it is a new installation or a repair, we will get back to you quickly.

  • MCS certified engineers for all renewable installations
  • Government grant applications handled for you
  • Full design, installation, and aftercare service
  • No obligation — free to submit a request

Prefer to call?

07915 357552 info@njgconstruction.co.uk

We'll contact you within minutes for emergency jobs, or within a few hours for standard requests.