Here are the exact charging instructions for those DC 400-6s
http://resources.fullriverbattery.com/fullriver-battery/charging-instructions/batteries.pdfNote the way they mark end of the absorption stage, and when it is full. You need the meters and set up to be able to see when you are there.
Note they suggest (it is not a law) to use 20% charging rate as a way to save gen time. You can go higher but not much. My AGMs say 27% max.
20% of 830 is 166 amps. Your charger goes to 125 amps. But your Honda 2000 can't do that much in VA even with the power-factor correction in the charger.
You can do it on shore power at the lower rate since time does not matter, but off-grid using the Honda you will have to dial down the amps of the charger like PT does so the Honda can do it or else get a second Honda to parallel them. However, if there is sunshine you can charge with the Magnum and solar at the same time and they will add their amps, so that would help.
Having so much battery is causing an imbalance in your set-up. Looks like you will need some generator /Magnum time (with solar on too) to do your Bulk, and solar to do the rest if you expect to reach Full in daytime while also running the RV.
You might want to set up for split- bank operation since you have so much battery. Run the rig on one set of 415 and get the other set to proper full. Then swap around.
