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I doubt you would be able to get the full rated power out of this head, but there's no reason it wouldn't work that I see. Just check the dimensions:
https://www.meccalte.com/downloads/s20w.pdf
You could just put a breaker (which you should put on anyway) on the output to limit the power...
You're looking for something with a J609B flange. I'm guessing due to the pandemic supply is rather constrained. I was able to find one that should work:
https://www.brandnewengines.com/S20W-110T.aspx
The bolts I used are M8. I think the ones I got are ~25mm, but I'm not sure off the top of my head. There's a L100V pdf brochure which has the specs for the mounting flange:
https://www.yanmar.com/media/global/2016/catalog/ln_series.pdf
The original alternator cover doesn't fit over the...
They are similar, but have a few differences. The BAPU is a 3.5kW unit and uses the L100 instead of the L48 Yanmar engine. The other difference is that font panel you're thinking of. The BAPU just has a small box with a few LEDs and a Hobbs meter. It would be easy to add gauges if you wanted...
Well there really aren't any factory gauges on this generator, so you're not really losing anything. The remote/local start capabilities still work fine. I literally did nothing to the wiring. Simply disconnected the wiring to the alternator and connected 28V to the same place you would...
I used the 6kW model:
https://www.northerntool.com/shop/tools/product_200395478_200395478
They say you need a 13hp engine for that model, but given this is a diesel with a bit more torque than a gas equivalent I think it should be fine. The engine itself is rated for 6.8kW mechanical output.
I got the generator head swapped on my BAPU unit. Everything went VERY smoothly! Only "fab" work needed was drilling two new holes for the rubber generator head mount. I think this video covers most of the work needed. The only things omitted were I used a 3 jaw puller to get the bushing off...