The 50-80 is to save gen time by charging in the SOC zone where the battery acceptance rate is highest. You only operate in the 80-99 zone when on solar and your amps are low (solar amps are low!) but you have all day, so it comes out fairly even in AH (unless it gets cloudy). Also that is daily and you might do a 50-80 every two or three days.
But that 50-80 leaves you badly undercharged so sulfation sets in immediately, so you can't do that very long and then you absolutely need shore power (takes a couple days so gen no good) to do a full "recovery" which includes an equalization to get the SG back to baseline.
My tactics are based on provincial park generator limit from 9-11am (ignoring the 6-8pm) so I want to get my 50-90 done in two hours. You can "arrange" that by choosing enough battery bank, charging amps, and enough gen to run those chargers at those amps.
IMO you now have all the info you need from this thread to figure out
your best tactics for your own situation. It is just going to take some time for it to sink in (give it a few months? it took me years to figure mine out) Everyone has his own scenario so you have to cherry pick from what others do that apply to you.
Yes you can run that 75 and 40 together. Not sure about the Honda 2000 but your advantage is that the 75er is PF corrected, which is a huge advantage for keeping the gen requirement down. My Honda 3000 will run 130amps of VECs at once but 135 amps makes it conk out. But with the PF corrected 100, I can also run 50amps of VECs for a total of 150 amps charging instead of 130. If I had more PF corrected chargers instead of the VECs I could do even more on the 3000.
Sounds like you could have just got the 40a VEC and never need the 75amper if you only operate in the high SOC zone, but now you have the 75amper, might as well find a role for it. Someday you might change your "camping" style and be real glad you have that 75amper.
