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--- electrical:12v:deep_cycle_battery [2020/01/07 21:22]
frater_secessus [flooded lead acid]
+++ electrical:12v:deep_cycle_battery [2020/02/20 13:51]
frater_secessus [Non-LiFePO4 lithium-ion]
@@ Line 216: / Line 216: @@
-There are hobbyists who build **4S packs** and undercharge the cells to only 3.7v.  This gives an operating range of 14.8v - 12v, a much better fit for nominal 12v systems. The downside is this configuration only uses 58% of the cells' capacity and will require more cells to achieve the same amount of Ah.
+There are hobbyists who build **4S packs** and undercharge the cells to only 3.7v.  This gives an operating range of 14.8v - 12v, a much better fit for nominal 12v systems. The downside is this configuration only uses 58% of the cells' capacity and will require more cells to achieve the same amount of Ah.  The cells could be fully charged then the output regulated back to more normal 12v voltage ranges.
 **7S builds** make a decent **24v bank**.  They are 29.4v fully charged and 21v discharged, compared to lead acid's 29.6v max voltage and 24.2v 50% DoD cutoff.  Discharging 7s li-ion to 24v((3.42v/cell) could help avoid LVD, making 35% of the cells' capacity unusable.

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