The reason the DC2DC converter does NOT run all the time is that (for
safety) Nissan has chosen to disconnect the HV battery from the rest of
the car (with contactors inside the main battery) whenever the car is
turned off. [Meaning that the ONLY place in the car where HV is present
is inside the bolted shut steel battery when the car is not in operation.
I feel this is a good engineering choice (but it wouldn't be a bad thing
to have a "if the 12v battery gets low, automatically turn on the car
and charge it back up for a while" mode that kicks in every few months
if the car is idle....)
Jay
On 12/15/20 5:17 PM, Ken Olum via EV wrote:
We have a 2013 Leaf and have replaced the 12V battery. In my opinion
this battery should not exist. It's just something to break or wear
out. Instead the DC/DC converter should run all the time (yes, it's
possible to build such a converter that is efficient at low loads), and
there should be some software to ensure that the total drain from the
traction pack is not too large, with some way to reset the system when it
has cut out for this reason.
Ken
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