Tools
Small calculators that answer one question properly, with the working shown. No sign up, no email, nothing to install.
Ah to kWh Calculator
Enter the voltage and the amp hours printed on the battery and get the kWh straight away. It also shows the two figures that matter more than the rating itself: how much of that energy you can safely take out, and roughly how much reaches your sockets once the inverter has taken its cut.
More on the way
We are building these in the order the questions actually arrive. If there is a sum you find yourself doing on the back of an envelope every time you price a system, tell us and it probably becomes the next one.