Frequently Asked Questions

Solar energy means turning sunlight into usable power, like electricity for your home or heat for your water. The most common method is through photovoltaic panels, or PV panels, which use specialized semiconductors to turn sunlight directly into electricity. Traditionally, solar panels were mounted on rooftops or spread across open land. But Thunder takes it a step further by blending solar into the spaces we already live in.

Absolutely. They keep generating power even on cloudy days. If there's enough light to see, there's enough light for Storm or Bolt to get to work. Our panels use advanced TOPCon technology instead of the more common and less expensive PERC cells. While direct sunlight gives the best results, your system is still active even when it’s overcast.

Solar performance depends on angle and direction, and the further south you are in the UK, the better your results. Our Storm kits are designed to deliver reliable output in typical UK conditions: Storm 360W can produce up to 320 kilowatt-hours of electricity per year Storm 710W can produce up to 640 kilowatt-hours per year At an average electricity rate of around £0.25 per kilowatt-hour, that means: Storm 360W could save you up to £80 per year Storm 710W could save you up to £160 per year As electricity prices rise, so will your savings grow over time. Of course, solar output can shift with the seasons and even hour by hour. That's why we recommend using our Savings Calculator. Just pop in your address to get a more personalised view of what Thunder can do for your home.

We want you to feel good about your purchase, knowing it leads to real savings and a lighter impact on the planet. Traditional solar setups in the UK usually take around 8 to 11 years to pay for themselves. That is because they often come with high costs for panels, installation, and planning permissions. With Thunder, it is a whole different story. Based on the estimates above: Storm 360W can pay for itself in around 6 years Storm 710W brings returns in around 4 years Even on a cloudy day, a Thunder plug-in kit puts you well ahead when it comes to value and payback time compared to traditional setups.

Each component comes with its own dedicated warranty. The microinverter is covered by a 10-year warranty. Solar panels are covered for 3 years, and accessories (cables, isolators, connectors, mounting hardware) for 2 years. All warranty periods start from the date of delivery. For full details, see our Warranty Policy.

Yes. You have 30 days from delivery to return your kit for any reason, as long as it is in resalable condition with all original parts and packaging. Return shipping is at your cost. Just email support@thunderenergy.co.uk (mailto:support@thunderenergy.co.uk)with your order number and we will guide you through the process. Please do not send anything back before receiving return approval from us.

Thunder modules are built to last. With quality materials and durable design, they will keep producing clean energy for years to come. To keep them running at their best, just give them a quick wipe with a cloth every other month.