You can use the Honda and Prosine at the same time as solar if the solar absorb voltage can be adjusted to the same as the Prosine's 14.4? so you don't have to use one at a time.
You can get more solar. Just don't expect miracles. :) Could get you by for a couple more days than now, at least. The batts don't have to get to "full" every day. You can do 50-90s till the power comes on. But then you need to do a serious Equalize session with the Prosine so the batts to get their SG back to "baseline" as seen on your hydrometer. (1.280?)