![]() This is also contrary to what the Nissan EV techs (at the hotline) have told people in the past, as well as what the manual seems to indicate - that charging the 12V battery is only done while in "Ready" mode, and that regular L2 charging, quick charging, and remote climate control won't engage charging. ![]() It'll just maintain the charge level it was last left at after the 14.4V charging phase ramps down. The problem is that, while 13.0V will make all the systems run off the DC-DC power (instead of discharging the 12V battery constantly), it will not actively charge the 12V battery. The computer uses a single PWM signal to tell the DC-DC unit exactly what voltage to provide to the 12V system - I think between 10V and 15V DC. The Leaf's DC-DC system (which acts as an "alternator" for converting high-voltage ~380v DC into low-voltage 12v DC) is entirely controlled by the computers in the Leaf - with very precise control. It's possible that the 14.4V charge is continued until the battery is only absorbing a low number of amps, before it drops down to 13.0V. There's a threshold voltage that has to be exceeded in order to actively charge the battery. ![]() Lower than that, they either charge very slowly, or they don't charge at all. First of all: 14.4V is the typical charging voltage for lead-acid batteries. The problem here is that the 12V battery is maintained at a 13.0V trickle charge with a very brief 14.4V boost charge. Here, I'll explain how the Leaf's 12V system behaves, and why those of us without 12V solar panels on the back are screwed so bad. This seems to be a topic very relevant to troubleshooting, less about benign technical details. I was a little stuck between posting this in "technical discussion" forum or the heavier-traffic General forums.
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