I use a Yamaha 3.8KVA generator and the full tank lasts about 20 hours+.
I used to use a Honda 2000iu and it lasted about 8 hours. So you topped it up just before dark.
I also have a Chinese yellow 3.5 KVA (I think that's it output Genquip or similar name). It worked for a while but was not very dependable. The pull cord snapped many times due to a very sharp edged metal cord guide.
The Yamaha or Honda will cost more but they will be fuss free and last a long time as long as you change the oil regularly.
Greg.
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