Actually your batteries will demand how much charge they will take. All you have to do is supply enough current for the batteries to use. The good rule of thumb is to have a source that will produce 15-18AMPS DC current for each battery you have in your bank.
Consider this report from Progressive Dynamics on how long it takes to charge batteries from the 50% SOC to the 90% SOC and 100% SOC. You can get almost the rated battery performance by just re-charging to the 90% SOC but you can only do about 12-14 cycles of 50% SOC - 90% soc before having to do a full 100% SOC.
"Progressive Dynamics ran this test on the amount of time it took a PD9155 (55-amp) converter/charger set to three different output voltages to recharge a 125 AH (Amp Hour) battery after it was fully discharged to 10.5-volts.
14.4-VOLTS (Boost Mode) – Returned the battery to 90% of full charge in approximately 3-hours. The battery reached full charge in approximately 11 hours.
13.6-VOLTS (Normal Mode) – Required 40-hours to return the battery to 90% of full charge and 78-hours to reach full charge.
13.2-VOLTS (Storage Mode) – Required 60-hours to return the battery to 90% of full charge and 100-hours to reach full charge."
When we are camping off the power grid we run our battery bank down to around 12.0VDC by each morning at 8AM. Then we connect the trailer Shore Power Connection to my 2KW Honda EU2000i Generator using a RV30A-15A LONG DOG=BONE Adapter (WALMART) and can re-charge my 255AH battery bank back to its 90% SOC is about three hours of generator run time using smart mode charging technology. This three hour time period usually fits into most of the camp grounds that have generator run time restrictions in place.
The only way we can make to 8AM each morning is to start out the one day/night run off the batteries at their 90% SOC. Otherwise it usually gets dark on us around 10PM at night
Just my thoughts here... Others have their own PLAN B to make it through the one DAY/NIGHT run off the batteries.
We have been very successful doing it this way over the years since around 2009 with my 14 R/T 255AH battery setup camping off the power grids alot.
Roy Ken
My Posts are IMHO based on my experiences - Words in CAPS does not mean I am shouting
Roy - Carolyn
RETIRED DOAF/DON/DOD/CONTR RADIO TECH (42yrs)
K9PHT (Since 1957) 146.52M
2010 F150, 5.4,3:73 Gears,SCab
2008 Starcraft 14RT EU2000i GEN
2005 Flagstaff 8528RESS