I run my on-board PD9260C from my 2KW generator to recharge my 50% depleted 255AH 12V battery bank and it takes around three hours of generator run time using the smart mode DC Voltages coming from the PD9260C converter/charger unit...
Usually where we camp OFF-GRID I am allowed to run my generator starting at 8AM each morning. Works out good for us as we can make our fresh coffee for the day and do a few other high wattage items during our breakfast time generator run time.
We pull alot of DC AMPS from our battery bank during the 6PM to 11PM evening time in our camper supporting our camping style and if I don't start out with a good 90% charge state my battery performance each day we will fall short on the batteries.
Been doing this Camping routine since 2009 mostly camping off-grid running off of the batteries.
My 255AH Battery started to lose performance at the end of last years camping season and I am now in the process of building up a new battery bank... Getting 7-8 years out of my GP24 12V Interstate batteries was a surprise for me... They just won't hold a charge very long now and one of them starts getting very warm when using them... I just pulled the plug on them at the of last years camping season...
Probably will be going for two groups of two 6V GC2 batteries in series for the new battery bank...
Roy Ken