When charging the batteries keep in mind the batteries determine the charge current. It is up to you to have that much power available. If you have around 20AMPS per battery available to use this will re-charge your battery in as little as three hours time starting out with 14.4VDC...
I always start my recharge around the 11.9 - 12.0VDC charge state when camping off the power grid. Hopefully for us this is planned to happen around 8AM every morning when we are allowed to run our trailer off of the 2KW generator haha...
My three batteries in my battery bank will draw around 52 amps for 15 minutes or so when I hit them with 14.4VDc smart mode charging and then start dropping off as the batteries start taking on charge... After around two hours at 14.4VDC then it drops down to 13.6VDC and the total current is still around 6 AMPs or so for my three batteries for another hour of charging.
Roy Ken