From Your Roof to Outer Space. Ready For Some Fun?
How Much Power Does the Sun Actually Produce?
One second of power from the sun could power the entire Earth for 650,000 years. Of course we could never capture the full amount, but even the amount that actually hits the Earth’s surface would only take 1 hour to power Earth for a year.
How Much Solar Would It Take to Power the Entire World?
If you ran solar panels back to back in a 707km x 707km square, almost anywhere on Earth, you could provide enough power for all 8bn of us. It’s roughly 300 billion panels, at a raw cost of $24 trillion. Sounds like a lot, and it is, but it’s only around 23% of the GDP of the planet in a single year. If we all chipped in, and had a lean year, it’s entirely plausible. Spread the cost over 10 years, and it’s weeks worth of wages each.
How Much CO₂ Could Solar Energy Eliminate?
The world pumps out 37.8 billion tonnes of energy-related CO₂ every year. If we replaced fossil fuels with solar, that’s enough emissions eliminated to cancel out the carbon footprint of every home on the planet (all 2 billion of them) four times over. It would do the work of 1.7 trillion trees, which is roughly twice the number currently standing on Earth. And we’d still have energy left over.
Has a Solar-Powered Plane Ever Flown Around the World?
In 2016, Solar Impulse 2 completed a circumnavigation of the globe powered entirely by the sun. It had a wingspan wider than a Boeing 747 but weighed about the same as a family car. Not a single drop of fuel was used.
Does the International Space Station Run on Solar Power?
More than 260,000 solar cells power the ISS as it orbits 400 kilometres above Earth. If NASA trusts solar panels to keep its astronauts alive, we’re pretty sure it can handle your home and EV.
Here’s a solar energy fact that sounds like science fiction…
Can Solar Panels Generate Electricity at Night?
“Thermal to electric” solar panels generate electricity by harnessing the temperature difference between the panel and the cold night sky. They are not commercially available yet, but real research is happening.
Can Solar Panels Repair Themselves?
There’s research being done on solar panels that can repair themselves. When a problematic crack develops, a special kind of polymer can reconnect with the other side, extending lifespan (which is critical for long-term profitability). Not available yet to the public.
How Long Does Sunlight Take to Reach Earth?
Light travels 150 million kilometres from the sun to Earth in roughly 8 minutes and 19 seconds. The nuclear fusion reaction blasting photons from the sun a few minutes ago is now charging somebody’s iPhone.
How Much Silver Is Inside a Solar Panel?
To reach our hypothetical 300 billion solar panels to power Earth, you’d need 300,000 tonnes of silver alone. That’s why scaling up would need to be done slowly over time. Mining that much silver would take full global production 12 years to produce, so there are real bottlenecks.
Do Solar Panels Work Better in Cold Weather?
Sounds illogical, but the closer solar panels operate to 25 degrees Celsius, the better they function. This is due to increasing efficiency by reducing thermal load. The optimal condition in the UK would be a bright summer mid-morning. Learn more about how efficient solar panels really are.
Can Solar Panels and Farming Share the Same Land?
Installing solar panels raised above crops, called agrivoltaics, can reduce water evaporation by 30%, while also boosting profits due to dual use of the same land, giving you food and electricity from the same field.
What’s the Most Unusual Solar Farm in the World?
The Panda Green Energy Group built a 100MW solar farm in Datong, China, designed in the shape of a giant panda when viewed from above. It generates enough power for around 10,000 homes. Because why should clean energy be boring?
Now for some solar panel facts closer to home…
Can Solar Panels Power an Entire Home?
The beautiful thing about solar panels is they’re pretty much perfectly sized for an entire home. The bigger the home gets, the more roof space there is, so power to usage ratios stay fairly constant (providing good conditions like a south-facing roof and little shade). Use our solar panel calculator to find out exactly how many panels your home needs.
How Many UK Homes Have Solar Panels?
Out of the 28 million homes in the UK, around 1.5m already have solar panels powering them. That’s around 5-6%. If current trends continue (10% growth per year), in around 30 years nearly all UK homes will be powered by solar.
How Much Do Solar Batteries Cost in the UK?
Adding a solar battery to your home solar install can increase the amount of energy you can use from 40% to 80% or more. A high quality, reliable solar battery with a long warranty that can store enough energy for a whole UK home can cost £4,500 (for the GivEnergy). See our full solar battery costs guide for a breakdown.
How Long Do Solar Batteries Last?
Lithium iron phosphate (LFP) batteries can handle 6,000+ charge-discharge cycles, with a normal home using about 0.5 to 1 cycle per day. With rising energy costs and stubborn inflation, they can make a totally reasonable hedge, and paired with solar panels, they can provide energy security for your home for years. Check out our best solar batteries guide for our top picks.
This next solar panel fact is the one most people want to know…
How Long Do Solar Panels Take to Pay for Themselves?
Depending on the type of solar panels you install, and how you use them, they can pay for themselves in 6-12 years. With an expected lifetime of 25 years, it’s possible to have 19 years’ worth of completely free energy. Find out how much solar panels cost and whether you qualify for any solar panel grants.
How Quickly Do Commercial Solar Panels Pay Back?
Solar panels for many businesses are a great investment for a few key reasons. First, the majority of companies are open during the day when the sun is out, so they’re in sync. Second, there are a lot of good incentives and tax breaks. You can write off the full cost in most cases in the first year, and collect SEG payments for 25 years. See our guide on commercial solar panel costs for a full breakdown.
Do You Get Paid for Excess Solar Energy in the UK?
The reason solar panels work so well in the UK is due to the Smart Export Guarantee. You sell your surplus energy back to energy companies for a guaranteed rate. It works even better if you add a solar battery, but the SEG helps pay for your system and provides profit long into the future.
Can Solar Thermal Panels Heat Your Water?
Solar thermal heats up your hot water directly from the sun, no conversion to electricity first. Solar thermal is much cheaper than solar PV, and can provide up to 60% of a home’s hot water, even in winter.
Are Solar Panels and Heat Pumps a Good Combination?
Pairing solar panels with a heat pump creates one of the most efficient home energy systems possible. The panels power the heat pump, which generates 3-4 times more heat energy than the electrical energy it consumes. Quite amazing!
Do Solar Panels Increase Property Value?
Solar panels can add more value to a home than they actually cost. A 2024 Swansea University study analysing over 1.5 million UK property transactions found that homes with solar panels sell for 6.1%-7.1% more than comparable homes without. Considering a 4 kW solar panel install can cost £6,000, that’s a pretty solid investment.
Do Solar Panels Work on a Flat Roof?
Solar panels on a flat roof can be orientated at the perfect angles using mounting frames. You can even set the angles independently, for perfect optimisation. The ideal UK panel angle is 30-40°.
Can Schools Save Money with Solar Panels?
Schools are perfect candidates for solar panels as they consume the most energy during daylight hours. If your local school doesn’t have them, maybe something to bring up next parents’ evening as they could save £3,000-£5,000 per year.
Can Solar Panels Charge an Electric Car?
Solar panels + an EV can reduce some of the biggest household costs. Driving 10,000 miles a year would require an extra 2,700 kWh of electricity, which could cost an additional £1,500-£2,500 in extra panels to power your car for 25 years. That’s about 0.6-1p per mile, over 15x cheaper than the 17p per mile from petrol.
