E
Ed Lee
Guest
On Saturday, October 22, 2022 at 3:28:07 PM UTC-7, Don Y wrote:
Just old age. The battery is 10 years old. The solar charger is probably dead also, or not enough sun in SF.
Yes, the Li power brick is essentially a built-in automatic jump starter. It\'s around $28 including shipping, but with more capacity than the $2899 UPS.
On 10/22/2022 3:05 PM, Ed Lee wrote:
My Leaf won\'t wakeup after 2 or 3 days sleeping. It\'s mostly because of
the 100W power relay.
Are you saying that the relay actuator dissipates 100W WHILE SLEEPING?
No, 100W when the car is on. After a few days, the 12V battery is too weak
to pull the 100W power relay (switching 400V on).
Is there a parasitic drain on that battery? Or, is it just undersized
for the task? (one would expect a car sitting for 2 or 3 days to be
somewhat \"normal use\")
Just old age. The battery is 10 years old. The solar charger is probably dead also, or not enough sun in SF.
Why isn\'t the resting state of the relay the one that doesn\'t draw power?
Does an additional 100W \"driving load\" hurt your efficiency that much that
it has to be moved to the \"charging\" state?
I could just jumper short the relay output, when i open up the battery
next time. For now, i just added a 200Wh (3S9P) Li power brick (around 5
pounds) to the LA battery. The Li BMS cutoff at 11.5V when charging.
It\'s fine in this case. The Li battery mostly keep the LA battery from
dropping too low.
So, you\'re just using the lithium battery to keep the leaky lead acid
battery \"topped off\". Could that brick achieve the same purpose if
connected to the battery via a pushbutton that you momentarily activate
prior to starting the vehicle? (Or, is the LA battery your main
propulsion battery pack)
Yes, i also did an emergency jump charging from 400V to 12V with 5S5P 200K
resistor. Not very efficient, but works and i happened to have the
resistors in the car, and 400V tap in the backseat. The traction/propulsion
battery is 24kWh 96S Li.
This suggests either replacing the battery with something with less
leakage/more reserve (assuming there is no unintentional leak)
or just installing the lithium battery as a built-in jump starter.
Though your approach suggests you don\'t have to worry about
keeping the lithium charged if permanently installed (?)
Yes, the Li power brick is essentially a built-in automatic jump starter. It\'s around $28 including shipping, but with more capacity than the $2899 UPS.