Atmosphere Posted October 24, 2021 Share Posted October 24, 2021 I have 4x 100ah AGM Batteries (mainly to get though loadshedding), grid tied. I'm curious about the exact correct settings to charge on my Deye 5K and what voltage I should consider "empty, do not cross" Typical loadshedding at night brings battery percentage down to about 86% / 49V after 2 hours Does it make a big difference how fast this type of battery charges? Quote Link to comment Share on other sites More sharing options...
Buyeye Posted October 24, 2021 Share Posted October 24, 2021 The charge current should preferably not exceed 0,2C (20A for a 100Ah battery).The temperature of a battery will increase by more than 10°C if the charge current exceeds 0,2C Quote Link to comment Share on other sites More sharing options...
Coulomb Posted October 25, 2021 Share Posted October 25, 2021 (edited) 6 hours ago, Atmosphere said: what voltage I should consider "empty, do not cross" I would say 48.0V. With moderate discharging, that still leaves some capacity in the battery for reasonable life. That's for 20S (4S nominally 12 V modules) lead acid, basically any variation of lead acid. Edit: at very low to no load, I'd say 49.0 V (12.25 V per module). Edited October 25, 2021 by Coulomb Quote Link to comment Share on other sites More sharing options...
Atmosphere Posted October 25, 2021 Author Share Posted October 25, 2021 Thank you... So basically only change charge from 40 to 20 And then I should consider "86% / 49V" as pretty much 0% remaining Quote Link to comment Share on other sites More sharing options...
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