Dual Fuel Carbs for generators generally aren’t available any more. Also, Onan references below also include Kohler’s. Onan Generators 4.0kw to 7.5 kw are a good selection when combined with a Trace SW4024 inverter package. I run my generator two hours a day and have electricity 24/7. (Generators are best run with a full load for maximal service life and fuel economy.)
I’ve noticed that many people think of having a generator and when the grid goes poof, cranking up the genny and life goes on. That dog doesn’t hunt. They usually use a ton of non-essential electricity.and that simply doesn’t cut it when the grid goes away. You can’t possibly run a 100KW for the needed period AND storing (and wasting ) that much fuel is foolish.
I’ve been able to get along wonderfully with a 4.0 KW Onan, I thought about going larger but by staying with the 4.0 KW, I was able to acquire two generators. I only need one but “Two is one and one is none” I do rotate the two on a scheduled basis. Anyway, I started out around 1999 with the one running on gasoline. (Note my property doesn’t have anything coming into it, no electricity, phone, water, NADA!) I went thru Y2K with that setup and it was great. So I went to buy the Dual Fuel carb and BINGO, Due to EPA/OSHA/some alphabet agency they don’t make that any more so I installed the Propane-only carb for both generators. I still have all the gas carb parts and can change back at will (30 minutes) but what a pain. Note: Do the conversion yourself and ask for help if you need it, BUT do it yourself. Then you can do it again when there is no help. Next to last note: Get the not so terribly older Onans/Kohlers. They have a mechanical voltage and frequency (60 Hz) adjustment/control and the Trace still loves it. These older units have minimal electronics to EMP fry (or simply fail). Worst thing you’ll generally find is a mud dauber plugs up the case vent hose and the thing stutters. (Use a coat hanger!)
Last note: Propane stores well! Underground tanks are a waste of time unless you really have to be hidden. Above ground tanks won’t “blow up” They will pop the safety valve and vent with a great big ball of flame but they won’t explode or fragment AND by going with above ground surplus tanks you can store a lot more propane. (I have 6000 gallons). (And mine survived the forest fires!) The only drawback to propane is you can’t go get 5 gallons of propane and pour it into your tank. That’s why you need propane and diesel for your fuel reserves. If anybody asks why you’re buying so much fuel? Tell them you’re buying ahead for your retirement so that when you DO retire your cost of living will be minimal for the first 6 years. or Buying ahead lets you buy when the price is best. Both are always accepted. Regards, – The Army Aviator