This shows you the differences between two versions of the page.
Both sides previous revision Previous revision Next revision | Previous revision Last revision Both sides next revision | ||
electrical:12v:self-jumpstarting [2024/03/20 19:47] frater_secessus [waking lithium batteries] |
electrical:12v:self-jumpstarting [2024/03/20 19:52] frater_secessus [waking lithium batteries] |
||
---|---|---|---|
Line 86: | Line 86: | ||
Lithium banks can go dormant at low voltages in order to protect themselves: | Lithium banks can go dormant at low voltages in order to protect themselves: | ||
- | - the BMS turns off the DISCHARGE channel | + | - the BMS turns off the DISCHARGE channel |
+ | - so the battery internally has ~11.0v or whatever but does not pass that voltage to the terminals on the outside of the battery case | ||
- which means smart chargers don't see battery voltage | - which means smart chargers don't see battery voltage | ||
- | - and think there' | + | - and think there' |
What we need is a //dumb// voltage source to get the party restarted. | What we need is a //dumb// voltage source to get the party restarted. | ||
* Rigs with IGN-triggered relays can briefly turn the key to ACC then back off.((don' | * Rigs with IGN-triggered relays can briefly turn the key to ACC then back off.((don' | ||
- | * Rigs with voltage-sensing relays will have to actually start the engine or press a manual override switch to activate the VSR and wake the lithium bank. | + | * Rigs with voltage-sensing relays will have to actually start the engine or press a manual override switch to activate the VSR and wake the lithium bank. |
+ | * Rigs with diode- or FET-based isolators would start the engine to spin the alternator and get power flowing through the isolator to the sleeping lithium | ||