I'm looking for advice on what size generator I would need. I am self building a house and while getting all of the professional blocklayers, carpenters, electricians, plumbers etc. to complete their line of work in the house there are a number of odd tasks that we will be completing ourselves that require a power source which we do not have available on site yet so I am looking at buying a generator. I'm bamboozled by the ads I see online displaying different makes, models, amps, watts, kVa etc. Could somebody advise on what I should be looking out for in terms of a portable petrol generator that would be sufficient at running 110 and 230 power tools. It will be used for powering everything from lights, hoovers, wall chasers, water pump, kangos, skill saw, mitre saw, angle grinders etc. Thanks