> I would say that most bad things happen to cars when they are in motion...
In simple terms, I'd say the opposite. Most bad things happen (fires and
bringing dow the house) occur when the cars are parked and plugged-in.
And that is the #1 advantage of an EV, which is available for charigng 95%
Jay Summet wrote:
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.
Ken Olum via EV wrote:
What danger are they
On 12/15/20 6:21 PM, (-Phil-) via EV wrote:
Tesla does this on newer S/X. There is a small always-on DC-DC that powers
the telematics and keeps it from deep-cycling the 12v AGM.
I was unaware of that; thanks for the information!
I'll offer a few disjointed EV 12v comments here. Many,
Engineering a DC-DC that can handle the full peak load as well as accept
the load dumps can be done, but the cost exceeds that of a small basic
DC-DC and a lead acid battery (so far). That's the real reason.
EU also now has an Ecall requirement that mandates the system still work
after an
Really the ONLY reason to have a 12v battery is for Emergency power.
Building a DC-DC that can handle the load is a solved problem.
You could easily have 2 DC-DC units. 1 tiny one that just handles the
parasitic loads and can power the "start" relays. (efficient, very little lost
power)
and a
out and
> calling for help if there's a problem. If it's unattended...
>
> Peri
>
> << Annoyed by leaf blowers ? https://quietcleanseattle.org/ >>
>
> -- Original Message --
> From: "Ken Olum via EV"
> To: ev@lists.evdl.org
> Cc: "Ken
16-Dec-20 1:45:59 PM
Subject: Re: [EVDL] Leaf 12 v battery.
From: Jay Summet
Date: Tue, 15 Dec 2020 20:05:14 -0500
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 i
From: Jay Summet
Date: Tue, 15 Dec 2020 20:05:14 -0500
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
I guess you would have to calculate amp hours to cranking power if you went
lithium. However I suspect the little lithium motorcycle batteries would be
best suited as they could survive the constant 14.4 to 13. 8v DC to DC charge.
I guess I should check by testing or ask what the charging cycle
t;
Sent: 15-Dec-20 5:05:14 PM
Subject: Re: [EVDL] Leaf 12 v battery.
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. [Mea
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
Tesla does this on newer S/X. There is a small always-on DC-DC that powers
the telematics and keeps it from deep-cycling the 12v AGM.
You still need a 12v battery to stiffen the 12v bus, provide load dump
capability, and emergency power for braking/steering should the HV system
fault though.
On
I can't speak for later years, but the 2011 had a non-trivial amount of
standby current. (Cell modem, infotainment, etc) So much so they added a
small solar panel to offset it, but if you parked in a garage and didn't
drive all that much, you ended up cycling it quite a bit.
On Tue, Dec 15, 2020
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
On 12/15/20 10:50 AM, Peri Hartman via EV wrote:
I thought the solar panels near the back were supposedly charging the
12v battery. Of course, if the car is in a garage most of the time, that
won't help much. I park outside and have had no problems with the 12v. I
don't know the current
y leaf blowers ? https://quietcleanseattle.org/ >>
-- Original Message --
From: "Peter C. Thompson via EV"
To: ev@lists.evdl.org
Cc: "Peter C. Thompson"
Sent: 15-Dec-20 7:02:38 AM
Subject: Re: [EVDL] Leaf 12 v battery.
The issue is most likely that the 12v batte
The issue is most likely that the 12v battery only charges when the
vehicle is running - not when the vehicle is charging the main battery.
This is why you will find reports of EVSE "damaging" the 12V battery.
Of course, I am welcome to be corrected. :)
Cheers, Peter
On 12/15/20 6:12 AM,
On 12/15/20 12:59 AM, Lee Hart via EV wrote:
Jay Summet via EV wrote:
Our Leaf's OEM 12v battery was dead after 4 yearsI replaced it
with an AGM, hopefully that one will last longer.
Our 2013 Leaf is still running on its original 12v battery. So far, so
good... Of course, starting the
Jay Summet via EV wrote:
Our Leaf's OEM 12v battery was dead after 4 yearsI replaced it with
an AGM, hopefully that one will last longer.
Our 2013 Leaf is still running on its original 12v battery. So far, so
good... Of course, starting the Leaf is pretty easy on the battery, even
in
The LEAF originally comes with an AGM aux batt., FWIW.
Mine was still 75% of rated capacity after 7.5 ys.
Sincerely,
Bob Bath
Note: any misspellings of the contents of this message are due to 55 y.o.
vision, hyperactive spell check changing what I typed, or fat fingering— not
cluelessness.
Our Leaf's OEM 12v battery was dead after 4 yearsI replaced it with
an AGM, hopefully that one will last longer.
Jay
On 12/14/20 8:10 PM, Lee Hart via EV wrote:
Lawrence Rhodes via EV wrote:
Back up to 14.4 while charging. The original 2013 Leaf battery
registered 6vdc at rest and the
Lawrence Rhodes via EV wrote:
Back up to 14.4 while charging. The original 2013 Leaf battery registered 6vdc at
rest and the Leaf won't" function without a 12v source. I don't see why a
starter battery is needed. There are inexpensive motorcycle Lithium batteries
available. Maybe one of
Back up to 14.4 while charging. The original 2013 Leaf battery registered 6vdc
at rest and the Leaf won't" function without a 12v source. I don't see why a
starter battery is needed. There are inexpensive motorcycle Lithium batteries
available. Maybe one of those little things would last
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