Turbo3 wrote:Dark current in the Leaf is spec'ed to be 50 ma or less from the 12v battery. So keeping an ELM plugged in with a 50ma draw at least doubles the dark current. So not a good idea to leave plugged in if you are not going to drive your Leaf for a while.
Not sure where you are getting the 100 times number from. Can you provide a link? Or is this just some general rule of thumb someone has come up with. But yes placing a device that which only increases dark current by 1% is better then using one that increases it by 100%.
I don't know the spec for the Leaf's total dark current. I have designed and manufactured equipment for Ford. Their spec was "less than 1 mA for an *individual* component". A 1.2 AH draw per day for a single device is excessive. Take a battery that has aged and has perhaps 25% of its original capacity. It may go on working perfectly to start the car if the dark current is low. But drain 1 AH per day from it and it will not start the car in a few days.
From http://www.mynissanleaf.com/viewtopic.p ... 58#p394661
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According to this post, the published capacity of the factory 55B24L(S) battery is 45Ah at a 20-hr rate. Let's suppose it has about 50Ah at very low rates.
Unfortunately, when I later measured the LEAF current draw with the ELM327 installed
, it was MUCH higher:
RegGuheert wrote:So this morning I measured the current draw of the LEAF with it plugged in: 175 mA.
It seems the ELM327 draws about 6X what the entire LEAF draws when off, making the total draw about 7X as much!
LEAF dark current at spec of 50 ma is pretty high.
Some people have measured and found 25 ma.
But LEAF 12V charging protocol is poor, and does not keep it fully charged to start with.
And some have measured 175 with ELM.
I have been lucky so far leaving ELM plugged in.
But a week without driving is risky.
Depending on where the 12V was at the start of the week.