cooldemo
Posts: 2
Joined: Wed Nov 08, 2017 11:52 am
Delivery Date: 08 Nov 2016
Leaf Number: 123456

Battery heater

Wed Nov 08, 2017 12:17 pm

Does anyone know how to turn on the battery heater via CAN messages ? I would like to use it to heat up the battery since the winter is coming and the range will be limited as well as fast charging on the older 24kWh model.

Smillymike
Posts: 5
Joined: Wed Sep 27, 2017 3:53 am
Delivery Date: 27 Sep 2017
Location: Quebec, Canada

Re: Battery heater

Wed Nov 08, 2017 5:12 pm

The heater work with temp sensors.
When the temps are going to -20 celcius the BMS tell the VCM to activate the pack relay then the relay for heating have power on his contact to supply the heating pads.

VCM and the BMS work together on this.

I replaced my 2011 battery pack with a 2014 one who have the heater and I studied how it work.

Best is to buy heat pads for oil pan for gaz car.
You stick four pads of 100Watts or 6 of 50 watts and there is a 120vac automatic switch for this.
Just plug all together and plug in a 120 vac.

I remember one man done this and it work very well

cooldemo
Posts: 2
Joined: Wed Nov 08, 2017 11:52 am
Delivery Date: 08 Nov 2016
Leaf Number: 123456

Re: Battery heater

Thu Nov 09, 2017 11:47 am

Yes, but the diagnostic system supports active test for the battery heater, that means there is a way to turn it on via CAN.

noodlez84
Posts: 7
Joined: Mon Dec 01, 2014 11:14 am
Delivery Date: 01 Dec 2014

Re: Battery heater

Thu Jan 02, 2020 12:31 pm

cooldemo wrote:
Thu Nov 09, 2017 11:47 am
Yes, but the diagnostic system supports active test for the battery heater, that means there is a way to turn it on via CAN.
I know this is an old thread, but @cooldemo, do you have if there's an app or tool one can use to activate the heater?

LeftieBiker
Moderator
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Joined: Wed May 22, 2013 3:17 am
Delivery Date: 30 Apr 2018
Location: Upstate New York, US

Re: Battery heater

Thu Jan 02, 2020 3:03 pm

The battery heater uses a grand total of 300 watts. That isn't enough to warm the pack even one temperature bar, I'd guess.
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noodlez84
Posts: 7
Joined: Mon Dec 01, 2014 11:14 am
Delivery Date: 01 Dec 2014

Re: Battery heater

Sat Jan 04, 2020 11:40 am

LeftieBiker wrote:
Thu Jan 02, 2020 3:03 pm
The battery heater uses a grand total of 300 watts. That isn't enough to warm the pack even one temperature bar, I'd guess.
But 300w overnight, let's say 10PM to 6AM, is 2.4kwh, plenty of heat, although my bill won't like it, it's cheaper than buying a new LEAF. ;)

Oilpan4
Posts: 1379
Joined: Wed Jan 09, 2019 10:51 pm
Delivery Date: 10 May 2018
Leaf Number: 004270

Re: Battery heater

Sat Jan 04, 2020 10:54 pm

As far as I can tell yes there is a diagnostic test that turns the heater on for a few seconds.
But as far as I can tell no one has came up with a way to turn on the internal heater.

In units of imperial it turns on around -4F to +4F, but it's off by +14F. That was the best anyone had been able to determine at the time of my searching on the subject winter of 2018-2019.

Someone on here added insulation and stick on heaters to their pack and were able to maintain temp 4 bars when it was -4F if I remember correctly.
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Oilpan4
Posts: 1379
Joined: Wed Jan 09, 2019 10:51 pm
Delivery Date: 10 May 2018
Leaf Number: 004270

Re: Battery heater

Sat Jan 04, 2020 10:58 pm

Here it tis.
https://mynissanleaf.com/viewtopic.php?f=37&t=15673

-6F and 4 temp bars, not. Not bad.
trumpvirus
Is going to get you.

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Dala
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Joined: Sun Oct 28, 2018 11:24 am
Delivery Date: 01 Jan 2015
Leaf Number: 316851
Location: Finland
Contact: Website

Re: Battery heater

Fri Jan 17, 2020 10:21 am

More discussion on this here:
https://github.com/openvehicles/Open-Ve ... issues/311

"Now when we are approaching the really cold months, it would be extremely beneficial for a Nissan Leaf to have more control for the battery heating. As you northern Leaf drivers might know, if the temperature of the battery drops below freezing, the Leaf will not fast-charge. What if we could control the heating of the battery like on a Tesla? This would be a game changer!

First of all, to see if your Leaf is equipped with DC heating elements inside the battery, there is a signal in the 0x5C0 frame that has 0/1 if pads are present or not. Frame4 bit0
Image

In 0x5C0 frame 0 bit 5, there is a heating start send request and in bit4 there is a stop heating request.
Image

The theory is that to start heating, you write bit5 to 1. BUT there is also a send request bit that might be necessary to write also. It's in frame 1 bit 0 (Batt_Heater_Mail_Send_Request)
Image

Anyone got a Leaf equipped with heater pads? :) This message does not appear to have CRC or PRUN protection. Also this should only be possible on AZE0 Leaf!"

Oilpan4
Posts: 1379
Joined: Wed Jan 09, 2019 10:51 pm
Delivery Date: 10 May 2018
Leaf Number: 004270

Re: Battery heater

Fri Jan 17, 2020 9:53 pm

It can drop to -16F here in new Mexico.

AZE0 that's 2013 to 2017 isn't it?
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Is going to get you.

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