Originally Posted by
djeddie
Firstly, I take it that it was a petrol genny? (i.e. the kind of thing from Machine Mart). They never give the power you're expect, you have to take account of power factor correction and other bits such as that. Always work out KVA rather that Watts. The other thing that can cause a problem is a lot of modern PSU's are switch-mode and they need a good earth, so was the genny earthed correctly, with a proper earth spike?
Anytime I've had no other choice than to run from a petrol genny I've always added a 500W halogen light (that's is on ALL of the time) as it helps settle the genny.
If you have to do it again go for a diesel genny from a proper supplier.