Probably a grill sized tank as gennys tend to use a decent amount of fuel.When you say a small bottle do you mean the size you use on lanterns? How long does it last ? I am looking for a small generator myself .
A lot of that depends on the load your genny is running. Mine runs at almost idle on small loads, conserving fuel, and starts sucking more when I turn on the big things like heat, water heater or stove. Also, remember you can cycle it on/off as needed. Fire it up every few hours to let your fridge/freezer recover then shut her down for a while.it has been a while since I tested it but it should run 12 to 20 hours on a 20lb bottle
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