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--- opinion:frater_secessus:self-heated_lifepo4 [2023/09/03 16:17]
frater_secessus [perfect storm for DIY warming]
+++ opinion:frater_secessus:self-heated_lifepo4 [2023/09/03 16:22]
frater_secessus [when self-heated might be preferable]
@@ Line 39: / Line 39: @@
-===== perfect storm for self-heated batteries =====
+===== when self-heated might be preferable =====
+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.  This problem does not occur with self-heated because heating only runs when charging is present.
+===== when DIY warming might be preferable =====
+==== robust charging ====
 With robust charging (alternator and/or bigger solar) there can be charging opportunities lost with self-heated batteries in freezing conditions.
@@ Line 56: / Line 66: @@
 If one was charging by alternator only and only driving to/from work while stealthing in freezing weather it's conceivable the self-heated batt would get *never get charged at all* because it wouldn't have time to get out of the heating phase.
+==== specific configurations ====
+You may want more control over the temperature setpoints.
+Note from Secessus:  "since reading [[https://diysolarforum.com/threads/why-you-cannot-charge-lifepo4-below-0-degrees-celsius.2912/page-2#post-199774|this cell spec sheet data]] I keep my bank at toasty 50deg F."

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