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--- electrical:12v:self-jumpstarting [2024/03/20 19:42]
frater_secessus [starter battery chargers alongside DC-DC chargers]
+++ electrical:12v:self-jumpstarting [2024/03/20 19:47]
frater_secessus [waking lithium batteries]
@@ Line 82: / Line 82: @@
-==== waking lithium batteries ====
+===== waking lithium batteries =====
+Lithium banks can go dormant at low voltages in order to protect themselves:
+  - the BMS turns off the DISCHARGE channel
+  - which means smart chargers don't see battery voltage
+  - and think there's a problem so they won't start
+What we need is a //dumb// voltage source to get the party restarted.  The starter battery will do nicely.
+  * Rigs with IGN-triggered relays can briefly turn the key to ACC then back off.((don't leave it on ACC long or the dead Li will suck power from the starter battery.  Either turn ACC off again or actually start the vehicle.))
+  * Rigs with voltage-sensing relays will have to actually start the engine to trigger the VSR and wake the lithium bank.

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