We had a 2.3 kW genny from Makro. Some unknown brand but at £199+vat it was a bargain. We were running a bit more off of it than Robbo so we used more fuel, about 55 litres over the 4 days, but we were running:
Fridge
Chest Freezer
3 x 12V coolboxes via adapter
1 x 12V coolbox via mains
TV/Video Unit
DVD Player
Electric Kettle (you should hear the genny kick in extra power as you turn it on!!)
Couldn't do Le Mans without electric now. And we call it "camping"
With regard to coolboxes, we use the ones from Carrefour. They are teh size of astandard coolbox but work off 12V and 240V. They come with both cables and also have a hot/cold switch so can be udes to keep things warm too (handy back in the UK) £30 each!!