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--- opinion:frater_secessus:dead_battery [2022/08/03 20:07]
frater_secessus created
+++ opinion:frater_secessus:dead_battery [2022/08/03 20:19]
frater_secessus [sources of charging]
@@ Line 10: / Line 10: @@
   - turn off all loads so your battery and any charging attempts aren't trying to run the household
   - disconnect solar panels, if solar is present, for the reasons given [[electrical:solar:charge_controller#connection_order|here]].
-  - apply some kind of charging - any charge is better than none in this scenario
+  - apply some kind of charging - any charge is better than none in this scenario - see below
   - when any solar charge controller comes back online((normal LEDS, etc)) reconnect solar panels
@@ Line 16: / Line 16: @@
 ==== sources of charging ====
-The fastest form of charging is by [[electrical:12v:alternator|alternator]]; if you have alternator charging start the vehicle and take it for a drive.
+The fastest form of charging is by [[electrical:12v:alternator|alternator]]; if you have alternator charging start the vehicle and take it for a drive.  \\
+Note:  if using [[electrical:12v:alternator#isolators|a plain isolator]] a completely dead aux battery can pull enough current to cause resets or overheating.  Use other methods first then use the alternator when Vbatt comes up a bit.
 Solar, if present, will often be a gentler charging method.  MPPT will run normally but PWM charge controllers will be [[electrical:solar:pwm_tweaking#pwm_s_achilles_heel|especially weak when battery voltage is lowest]].

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