I purchased an used 2006 Toyota Highland Hybrid (HH). I unintentionally discovered that when the standard 12 volt car like battery is completely discharged, this hybrid would not start. This is normal for most vehicles, but this is a hybrid; it has 288 volt batteries underneath the rear passenger seat. From what I can determine, there is no way to temporary charge up the 12 volt battery from the 288 volt batteries. I then wondered if there was anyway to "jump start" the 12 volt battery, using the hybrid battery. I realize the hybrid battery is at
288 V.. A transformer would be needed to step down the voltage to 12 volts. I ask as I live in a colder climate - Minnesota. Rarely, 12 volt car batteries "die" when the outside temperature is -20 F or lower. With a HH, I have the hybrid battery. This hybrid battery is also inside the car. It may be slightly warmer, if the HH is parked out in sun on these-20 F days (even 0 F is warmer).
Is there any way to temporarily get DC power from the 288V hybrid battery to the 12V battery? Looking at a HH that will not start at -20 F below would be an unpleasant sight, at least for us fools who live in such climates. This especially would be distressing as there is plenty of electric power stored in the hybrid battery.
Getting AC current from the hybrid battery would also be nice. If the above would work, ex. getting 12 V DC from the hybrid battery, this could be converted into AC. End