I'd stick with gas.
I used to have a hyundai SEi3000 3kw 'silent' genny but it was never that quiet and was a pain in the arse to lug around.
I bought a decent butane powered soldering iron from Maplins that is doing the trick - but I do cheat by using speed passion push fit motor connectors.
When charging in my van I'll just run off the leisure battery bank - which, during the summer is topped up by a 150w roof mounted panel
