See how much solar panels and a home battery could save you, and which sizes make sense for your home.
Sets how much sunshine your area gets.
It's on your annual statement. A typical UK home uses about 2,700 kWh.
A heat pump or electric heaters put much more of your use in winter, when there's least sun.
Power used while the sun is up comes straight from the panels.
Economy 7 and electric car tariffs are cheaper overnight, so a battery can charge up cheaply and power your home the next day.
The fixed daily charge on your bill. It's taken off before we work out how much electricity you use.
We've filled in today's price cap. Your bill shows your actual prices.
What you're paid for solar you send to the grid. The best deals pay around 12p, but many suppliers pay nearer 4p.
Around 8p on electric car tariffs, and around 15p on Economy 7.
The battery charges from the grid in these hours.
This is part of the electricity you use a year, not on top of it. A car doing 8,000 miles a year takes about 2,500 kWh.
Your heating then already runs on the cheap rate, so a battery has less to save.
Add an array for each roof the panels go on. With one array you can leave the size blank for our suggestion, or enter 0 for a battery on its own.
The suggested size is where each extra kWh stops adding much saving.
Each extra kWh of battery saves less than the one before.
Where your electricity comes from, and the solar you export.
Hour by hour in June.
Hour by hour in December.
Saving a year for each solar and battery size. Select a cell to see it above.
These are estimates for a typical year, to help you compare options. Solar figures are based on PVGIS data (© European Union, JRC) for your region. Your household's use is modelled on a typical UK home. Real results depend on shading, the exact panels and your habits, so ask an installer to survey your home before you buy.
Disclaimer: These are indicative estimates, not an MCS performance estimate or a system design. They assume nothing shades the panels, typical-year sunshine for your region and a typical UK home's pattern of use, so your own saving could differ by 10% or more. Prices stay at what you enter, and panels and batteries fading with age, repairs and any limit on how much you can export are left out. Payback is the quote divided by the first year's saving. Most suppliers only pay for exports from an MCS-certified installation. Have a qualified installer survey your home before you buy. ProWorks gives no warranty as to accuracy or fitness for purpose and accepts no liability for any loss arising from use of these results.
It works through all 8,760 hours of a typical year. Each hour, the solar power goes to your home first, then into the battery, and anything left over is exported.
The saving is the electricity you no longer buy, plus the payments for what you export, at the prices you enter. It doesn't include the standing charge, which stays the same. On a cheaper overnight tariff, it's measured against that same tariff with no solar or battery.
Solar peaks at midday, but most homes use the most in the evening. A battery stores the midday surplus for later, so you buy less from the grid and export less.
The share link carries your answers so whoever opens it sees the same results. It keeps only the letters at the start of your postcode, such as BS, never your full address.