The
Onan P4500i's specs on paper are pretty good. If these specs hold-up in the realworld . . . along with some proven reliability and warranty/parts support, then Onan may have a competitive entry here. Agree with theoldwizard1 though, the Onan P4500i appears to be a rebranded Ducar generator with possibly some minor tweaking for resale by Onan. A common scenario for many generators these days. If I was in the market for this particular generator, I'd purchase it from a distributor (regardless of brand name) that provided the best after-the-sale warranty and parts support---which may or may not be Onan.
