In theory (as I have read over the years here), as long as your lead acid battery bank is cycling daily (like 50% to 80%), you really do not need daily Float/EQ charging.The "standard" reply is to cycle to >90% once per week. However, one major mfg (Rolls/Surrette?) had said that >90% is only needed every 4 weeks (if daily 50-80% cycling).If the batteries are not cycling (you leave the cabin for a week at 50% SoC and bad weather)--You do really need to get upwards to 90%+ State of Charge before putting the cabin/batteries "to bed"--When there is no immediate solar charging available (days/weeks of assumed bad weather/missing sun) getting the bank charged will help reduce Sulfation (which is, more or less, permanent battery damage).-Bill "I am not a battery engineer" B.
My battery specs state maximum life span 4500 cycles at 20% D.O.D. The cycles stated for 50% D.O.D. is half that. Would it not be wise to design a system based on 20% D.O.D., albeit more upfront investment, and have lots of extra power when needed?
So, I reduced the Amp hours programmed into the SCP/ XW from 630 to 315 amp hours and absorb exited to float at 6.3 amps as opposed to 12.6 as expected.The amps on the XW display where at approx. 4 amps. The float charge over night can still reduce the amps on the XW to less than 1 amp. Would this setting suffice in the field when running off solar alone? (currently I am charging from grid power)Would you reduce the amp hour setting even further to less than 1% exit to float?Appreciate the dialogue as always:)