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.

Work out the BTU your room needs and which portable and split units cover it.

See what an air conditioner costs to run per hour, per day and across a summer.