I do the same thing here just let it drop down to around 12.1 to 12.0 VDC as read on my BATTERY MONITOR PANEL.
I have planned for this to happen around 8Am each morning when I am allowed to run my 2KW Generator. If it gets down to this level before 8AM I switch off my batteries and wait until morning...
My Battery monitor is tied in with Battery selector switches reading each battery bank. Of course with both selected I will read the same DC VOLTAGE for Bank1 or Bank2. The DC Current is shown for the DC connection feeding my 12VDC Distribution Panel. This lets me see what is being pulled from the batteries as well as what is being put into the batteries when charging.
Of course none of this is absolute so just getting close is OK for me. been doing this setup since 2009 with no issues.
My three 12V 85AH Standard issue Interstate batteries lasted until 2015-2016 when they started to lose performance. I would be camping off-grid and doing the almost 50% to 90% cycles for some 5-10 times before doing a full 100% charge state when I got back home...
I am hoping to get similar results from my new battery bank I am currently working on paralleling two groups of two 6v GC2 215Ah Duracell Batteries I just recently purchased.
Folks are already telling me I may have to increase my 60A PD9260C converter/charger to a 80 A setup and maybe using 14.8 Boost charging voltages. Going to try with what I have and see how much more time it will add to my previous three hour smart charging time. Where I camp off grid has generator run time restrictions in place but I can add a couple more hours. I may have to drop back to just be running two 6V GC2 batteries giving me 215AHs until I come up with a 80A smart mode charging unit converter/charger. I might have enough time to do each of the battery banks groups separately...
Roy Ken
