rmay635703
Well-known member
- Joined
- Jan 19, 2011
- Messages
- 628
I have about 250 ahr of NiMH batteries enough to make a 13.2 volt or 14.4 volt battery.
I am wondering if anyone has played with the absolute limits on the 12v system.
I know on the volt a CEL occurs if battery volt exceeds 16.5 volts, the leaf I have no idea. Some creative use of diodes and a switch could keep the car from seeing an excessive voltage while charging.
The idea here is that no voltage transformations or system hacking will occur, the car shuts off the DC-DC if the voltage is above a certain threshhold, this means a battery that is slightly higher in voltage will provide the 12v current until its capacity is dimished. It appears the cut in point for the DC-DC is such that either battery would not overdischarge.
Looking it appears that a rather large chunk of juice is going out the 12v system and that a bit more passive capacity would add 1-3 kw depending on the duration of the trip. Also understand that the DC-DC loss is gone so the true gain in capacity will be slightly higher.
Not insignificant, but also very cheap and simple to add.
Let me know if you have any ideas, I am also wondering where the leaf floats the battery during driving and how low it will allow under heavy 12v draw.
Cheers
Ryan
I am wondering if anyone has played with the absolute limits on the 12v system.
I know on the volt a CEL occurs if battery volt exceeds 16.5 volts, the leaf I have no idea. Some creative use of diodes and a switch could keep the car from seeing an excessive voltage while charging.
The idea here is that no voltage transformations or system hacking will occur, the car shuts off the DC-DC if the voltage is above a certain threshhold, this means a battery that is slightly higher in voltage will provide the 12v current until its capacity is dimished. It appears the cut in point for the DC-DC is such that either battery would not overdischarge.
Looking it appears that a rather large chunk of juice is going out the 12v system and that a bit more passive capacity would add 1-3 kw depending on the duration of the trip. Also understand that the DC-DC loss is gone so the true gain in capacity will be slightly higher.
Not insignificant, but also very cheap and simple to add.
Let me know if you have any ideas, I am also wondering where the leaf floats the battery during driving and how low it will allow under heavy 12v draw.
Cheers
Ryan