If you really need reliable intermittent generator power, look at nat
gas or propane powered units.

Nat. gas or propane for a 1 kW *portable* generator????? On what planet
is that practical?

Pete C.

you can buy natural gas and propane small generators, pricey because
theres little demand, the regulator and mixing valves arent a big deal.

derate gasoline generators about 20% when run on natural gas or propane
since they have less energy than gasoline