WoolyM:
The one that was mentioned at makro 5.5kva. What does that mean? Is it more powerful?
Are some more fuel efficient than others?
What other things are relevant?
Said I was unknowing in this area.........
It wasn't me who mentioned the 5.5kva one.
Without a link or more details, I can't be certain.
1 kVA is basically the same as 1kW, so on the surface of it, a 5.5kva model would provide twice the output of this model .
However is that peak output or continuous? I always specify them as continuous output. Who cares what they can output for a few seconds peak?
Also a 5.5kVA petrol generator for £150 would be an amazing price if its available - I'm surprised its not got a deal of it's own posted at that price and scorching hot too as they usually cost well in excess of £500
Typical prices for a generator of this capacity start at about £200 without the wheel kit. As these are extremely heavy, a wheel kit makes them so much easier to move.
Edit: Regarding efficiency, that will vary and will be primarily based on (a) the efficiency of the engine and (b) the efficiency of the generator to produce the electricity.
However, this isn't an efficient method of producing electricity anyway. It's all about making electricity available. Runtime (the time it will run on on filling) is the usual criteria.
If running economy is important, using a generator best matched to the required output will generally be most economic