Matt Ohio

Running overnight and recharging during the day is the next step, Peter.  I'm probably going to add another 8 panels to bring the total to 4 kW and then proceed that way.  Days are getting shorter here in Ohio and during the winter it's very cloudy in January and February, so I'll see how this goes.  I may add a wind turbine on a separate controller if I can find one that is 48 V, because if it's cloudy here, chances are it's also windy.  There is no difference in cost for peak or non-peak with the utility, the cost is about USD $0.10 per kWh.

I apologize, I think that I mis-stated the depth of discharge.  What I meant to say was that I only use 10% of the full charge each day, then recharge it back to 100% during the remaining daylight hours.  

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?