These links will allow you to:

Calculate and store the amps of your appliances.

Calculate the life of your battery under a given load and the amps generated with a solar panel.

Calculate your caravan’s tyre pressures.

Watts to amps conversion table with a battery usage calculator.
 

Calculate the amps required for a given EHU amperage

Simple Crib sheet to calculate the amperage of any given appliance

Unfortunately these spreadsheets will only work in Internet Explorer.