This might be enough extra juice to save from having to add an extra battery and solar panels. In general, the higher the current, the lower you can set the cutoff. A dedicated battery isolator as used in 4WD and campers - they work fully automatic, if the input voltage is high enough they allow to charge the battery otherwise they block this way, once battery is going however they won't protect the output and shut off. The charger I was talking about had simple LED lights to indicate what stage the charger was in. Low Self-Discharge ... Once a pre -set voltage has been reach ed the battery is kept at that voltage (the float phase). Also, the end-of-charge voltage at which the batteries begin to outgas is important. What events can occur in the electoral votes count that would overturn election results? Why is 2 special? Could you design a fighter plane for a centaur? You must define a spec to choose desired %DoD and thus capacity and thus lower cutoff voltage and thus lower cumulative Ah capacity* charge cycles. If the battery should not be discharged to less than 12V, does this refer to the battery's resting voltage or the lower voltage that I am seeing while it is powering devices? I want the right balance between battery longevity and being able to use it for the purposes for which I purchased the solution. Our inverter chargers are designed with circuit to shut off inverter at adjustable low battery cutoff voltage set points. Let it sit at room temperature for 24 hours and measure the open circuit voltage at the end of that period. CDN$18.29. How do I correctly set Battery Low Voltage Cut Off? Another idea is to actually measure and integrate net discharge while you are using the battery, from the time it is full to the time the inverter cuts off. https://www.solarpaneltalk.com/forum...ischarging-agm. By contrast, the LiFePO4 batteries w ere able to still deliver 175Ah , more than an AGM battery delivers at room temperature . To get a full charge, you must continue to apply a current after the battery voltage … It occurs during charge transfers and life cycles reduce 50% for every 10'C rise above room temp and to some extent by the minimum % DOD or cutoff voltage you choose. In the case of Sealed batteries (AGM) you shouldn't think of Equalization the same way as you do for Flooded, as the voltage isn't high enough to promote vigorous gassing, it is just using the Equalization 'label' to reuse the concept of a occasional 'freshening' of the battery. Discharging the battery to 11.3V instead of 11.5V could e.g. But for a flooded battery, that would be an option to determine true SOC. Battery aging is inevitable. This information is available on the battery itself: Battery aging is inevitable. With an AGM battery, you should make sure that the charging voltage never exceeds 14.8V. If a cycle is a day, that adds over 1.25 years to the life of the battery. If If Gel can be charged at C/10, how come it's not recommended for solar? If possible, the battery temperature during charging should be between 20°C (68°F) and 30°C (86°F). Asking for help, clarification, or responding to other answers. Because it is an AGM battery, you do not have access to the electrolyte and cannot measure density of the electrolyte as you could with a flooded lead acid battery. Looking at harbor freight for a solar cell phone charger let to the 100 watt 4 panel set up they had ... and 2 used AGM 6v batteries with a 1500w inverter back fed into a receptacle of my house. Rechargeable batteries deliver very good performance and life if we take care of them. 1273 ” part aloud batteries begin to outgas is important bank ) > 70 - 100... Set at 10.0VDC at position “0” by default 11.5V with your current load > would! 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