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--- opinion:frater_secessus:self-heated_lifepo4 [2023/09/03 16:21]
frater_secessus [perfect storm for self-heated batteries]
+++ opinion:frater_secessus:self-heated_lifepo4 [2023/09/03 16:22]
frater_secessus [robust charging]
@@ Line 43: / Line 43: @@
 When you want a packaged solution.
-If you run your bank very low habitually((stop doing that!)) and the warming load is enough to trigger BMS discharge shutdown.
+If you run your bank very low habitually((stop doing that!)) and the warming load is enough to trigger BMS discharge shutdown.  This problem does not occur with self-heated because heating only runs when charging is present.
@@ Line 53: / Line 53: @@
 With robust charging (alternator and/or bigger solar) there can be charging opportunities lost with self-heated batteries in freezing conditions.
-Imagine
+Imagine the following scenario
-* freezing overnights followed by a half-hour drive in the morning with a 30A DC-DC.
+  * freezing overnights followed by a half-hour drive in the morning with a 30A DC-DC.
-* a battery with warming pad that consumed 60Wh overnight to stay above freezing, vs
+  * a battery with warming pad that consumed 60Wh overnight to stay above freezing, vs
-* a self-heating battery that is below freezing in the morning
+  * a self-heating battery that is below freezing in the morning
 The externally warmed bank accepts current immediately and takes **15Ah of recharge**.  So after recouping the 60Wh used overnight it's **net +132Wh**.

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