It’s best if you can arrange a foot of clear space all round the battery and above it. Running a single power tool or a couple of lamps is fine, but if you plug in the fridge you’ll pull far too much current from the battery.
If you’re lucky, the battery will go flat in a hurry.
There are plenty of ways to provide yourself with a reliable source of post-disaster electricity.
Attack the black lead from the invertor to the negative terminal, then the red lead to the positive. Now you can plug in your circular saw or lamp, and the invertor will work like a regular power outlet.
There are a few safety points to watch out for when you’re running things off a battery.
But what if, for some reason, it’s not available to you?
There are all sorts of reasons why your power supply might not work.