I have an off-grid solar
PV system that runs my home office, refrigerators, and freezers for about 25% of each day. Here is some brief information to establish context for my question: I have 20 Werker 100aH AGM batteries in 5 strings of 4 batteries (48 volt system) in a climate controlled basement, supplying power to a Samlex 3000 Watt pure sine wave inverter and 120 V distribution system. The batteries are recharged by 32 - 100W Renogy 100D monocrystalline panels that feed
a couple of combiner panels, disconnects, and a Schneider MPPT controller. My local
Batteries Plus dealer told me that to get the best life out of the batteries, I should
discharge the battery system approximately 10% every day (and not recharging during discharging), then once I arrive at 10% discharge revert my home office and appliances back to the grid while the solar
panels are recharging the batteries by bulk/absorption/float throughout the afternoon until sundown. The next morning I manually switch back to battery power for approximately 6 hours to achieve the 10% discharge. I saw a post by Chris Olson stating that FLA batteries should be deeply discharged once/month, but what about AGM batteries? I would like to get at least 10 years of life from these batteries; most were purchased in 2014 and 2015. Are there any AGM battery experts that can debunk the 10% DOD suggestion, and suggest a more optimum cycle?