I've just bought a 3W LED worklamp and fitted it to the back of my van to give me some light when sorting out the bike, cooking etc. and for some support stuff at the Puffer. I was wondering if it was possible to estimate just how much time I could use the light before being unable to start the van.
It's a Renault Trafic which comes (AFAIK) with a 63Ah battery. The lamp is 3W, drawing 0.9A at 12V.
I understand that it's not an exact science, but are we talking minutes or hours??

