For off-grid generators I have found that the Onan propane RV units like model #HGJAB are a great unit. (Onan is owned by Cummins, same units as Cummins Commercial series I believe) These are only 6500 watt units but they are low RPM, very quiet, fuel efficient, and start great in cold temps. (the 5500 watt model is the same unit but runs lower rpm=lower power) they do need an external battery and charger (and battery cables...) and you have to build a stand to set them on.
We sometimes have to "oversize" generators just so the customer can run large loads while the batteries are charging, which leads to the need for the 10kw (or bigger) generators. I have not found a good option for these either. In my opinion, these big gennys are very inefficient at battery charging, cost a lot, are hard to start, difficult to service/replace, and come with all the electronics issues mentioned earlier. I find if I can educate the customer to wait to run big loads until after the initial bulk charge cycle they can often get by on the 6500 watt unit and they are happier in the long run. If I can't win on this, I try to get them buy their own genny so it is their problem! I wish we had a decent AC coupled generator option! Travis Jordan tra...@jordansolar.net tra...@mtsolar.us
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