You can re-charge your deep cycle batteries in three hours time to the 90% charge state if you run 14.4VDC to them with around 20AMPs of capacity for each battery being charged.
Your solar panels will have a controller to do this for you.
I also have a nice home made battery monitoring panel on the inside of my off-road POPUP that will monitor my DC Voltages and DC Current that is either going into the batteries or being drawn from the batteries.
This is the only way to know for sure what is happening to your batteries.
my monitor panel looks like this but you can buy a nice battery monitor panel as well.
I go by this handy DC VOLTAGE verses STATE OF CHARGE chart...
It is not absolute but will get you close enough. You have to stop your charging and let the batteries set for a few minutes and then read the DC VOLTAGES...
Looks like "JIM IN DENVER" and I learned from the same expert haha... We do almost the same tricks...
It doesnt matter where you get your voltage from SOLAR or BATTERIES but follow this progressive dynamic report on how long it takes to charge up a deep cycle battery. This is battery science so no short cuts will help...
"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."
Once you get all setup then its OLD HAT when camping off the power grid.
Roy Ken
