Agree, replace the 80 watt panels with 160 watt panels or even a 305 watt panel( slightly larger. also usually 24v), American made, both can be had for $150/ea now on EBAY just bought 3 for my H380. The price is down 9/10th from ten years ago and the watts are way up. They are also Mono Crystal.... which work in less than optimum light and angle, so much more effective at generating watts and are in reality 40% better than the same watt panel of a decade ago if you could find one back then...
I also ordered the new Hunter Owners 30 watt solar panel for charging the Starter Batt... Noting it is 6 times better than 15 years ago.
I so far have decided not to get a Diesel Genset, the cost of $12K installed for 3.5 Kilowatt is just 2 high after 30K of upgrades and more to come), and given that with just a 30 gallon diesel fuel tank, and 6 gallons per day usage, that's a bit too high for heavy usage. I have opted instead for a 2KW Yamaha Portable gas genset for the occasional use whose cost is less than the maintenance on a Diesel genset and can run all day on a gallon of gas. At 42lbs , I can move it around, even take it to the beach in the RIB... will power my dive compressor... or microwave. I can replace at maintenance price of the Diesel/ one service call at my dock...lol.
My second battery Bank, for now is also where the diesel Genset would go.... And I can add a second portable hooked together and also run the A/C (ups to 88lbs total). Only run one when the load is light, or only take one unless, I'm going to be on the hook a longer period in hot weather, and in either case, still use less fuel and with the inverters have cleaner electric. It was some serious cruisers who recommended going with the portables instead.... Note with 2 I have a backup available if 1 fails, not weeks w/o power if the built in genset fails and I can replace both for 2k in a day.
All that said if I had the 12K handy, I might opt for the 12K genset if I had more diesel storage. The H380, does not have a lot of large storage areas either (lots of storage if you at storing smaller items), one of its few weaknesses other than being a bit tender.
Regards,