Tools

Free calculators to help you make the numbers work.

Solar Payback Calculator

Estimate how long a rooftop solar system takes to pay for itself.

See the yearly saving and payback of an 800W plug-in balcony kit.

Find your network operator and how to send the free G98 notification for plug-in solar.

Compare a heat pump's yearly running cost against your gas boiler.

Check your home's EPC-based heat-pump suitability and £7,500 grant eligibility.

Find the right home battery size and estimate off-peak savings.

See which portable power stations can run your appliances, and for how long.