Apkungen
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Joined: Tue Sep 29, 2015 7:17 am
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How to extend Nissan leaf range with extra batteries?

Tue Sep 29, 2015 7:31 am

I have gotten a deal on some 18650 Li ion batteries at 200dollar/kWh so i would like to buy an used Nissan leaf and extend its battery with about 24kWh which would cost 4800dollar (weigh 130kg)and extend its range with more than doubble of todays since i can depleat them more the few times i actually have to use the full range. Usually i get 100km from the leafes i have driven. With this i could easily get 200km.

I read something about this being done by a company in The US. Does anyone know of it has ben done by a private person, how Hard it is and if i can get any information on "how to" somewhere?

Apkungen
Posts: 3
Joined: Tue Sep 29, 2015 7:17 am
Delivery Date: 29 Sep 2015

Re: How to extend Nissan leaf range with extra batteries?

Tue Sep 29, 2015 3:19 pm

Here is something on the Subject!

URL removed by moderator see warning.
Last edited by Apkungen on Wed Sep 30, 2015 6:29 am, edited 1 time in total.

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DuncanCunningham
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Re: How to extend Nissan leaf range with extra batteries?

Tue Sep 29, 2015 3:37 pm

Statler: Wake up you old fool. You slept through the show.
Waldorf: Who's a fool? You watched it.

2015 Leaf S (leased until May 2018, Bought out in Jan 2017)
2012 Leaf SL (purchased May 2015)

TorC
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Location: Sandefjord, Norway

Re: How to extend Nissan leaf range with extra batteries?

Tue Dec 29, 2015 3:39 pm

Apkungen wrote:I have gotten a deal on some 18650 Li ion batteries at 200dollar/kWh so i would like to buy an used Nissan leaf and extend its battery with about 24kWh which would cost 4800dollar (weigh 130kg)and extend its range with more than doubble of todays since i can depleat them more the few times i actually have to use the full range. Usually i get 100km from the leafes i have driven. With this i could easily get 200km.

I read something about this being done by a company in The US. Does anyone know of it has ben done by a private person, how Hard it is and if i can get any information on "how to" somewhere?


Please do not play with 18650 cells on such "high" voltage (you need at least 96 volts if it is any use on 24 kwh). To make a pack at 24 kwh you will need over 2000 cells, and every connection is a hazard, and you will need a BMS that can handle at least 500 series. Or use a many BMS

I do not think 18650s are suitable for such a Rex, even if you play it safe and only make a pack at 4 kwh. This should be done at a factory where every connection is perfect.

I think that the best you can do with 18650 and LEAF is to make a micro-REX. Make a 500 wh pack(about 45 pieces of 18650 cells) with nom 20,4 v and connect it to a stepdown to 13,5 or 14 v and connect it to the battery or 12v outlet. That would eliminate the wattage the main battery pack need to give to the 12v system. That should give you about 4 km more range... If you add another 45 more 18650 cells, and drive really slow and efficient you could probably get at total of 10 km extra.... But your trip will take 3 hours to deplete all battery packs...

I am playing with this idea myself. Since I am sometimes out of range and the last 20 km I often drive very very slow, and often get close to 9 km per kwh. With such low speeds the 12 v system is a lot larger factor. In such "emergencies" it would be nice to use the few hundred watt hours on moving the car, not on lights etc. This is the same route every time, and there are no QC or normal charge nearby. So I either got to QC about 30 km before my end destination, or drive very slowly. That QC charges in 15 minute intervals, so I often chose to just to use the scenic route and lower my speed.

So for me that extra 500 wh would help quite a lot. And another 500 wh could be used for seat heaters!

Based on you nick I assume that you are from Sweden... I live in Norway. If you still have a lot of 18650 cells available I would be interested in buying some of them.

mcdavidbranson
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Joined: Tue May 10, 2016 10:11 am
Delivery Date: 18 Feb 2016

Re: How to extend Nissan leaf range with extra batteries?

Tue May 10, 2016 12:20 pm

Great post ! Very informative !

Domdymond
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Joined: Wed Apr 12, 2017 10:59 am
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Re: How to extend Nissan leaf range with extra batteries?

Wed Apr 12, 2017 11:03 am

Look up jehu garcia samba project youtube

LincolnW
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Joined: Wed Mar 15, 2017 9:50 am
Delivery Date: 04 Jun 2017
Location: Portland, Oregon

Re: How to extend Nissan leaf range with extra batteries?

Wed Apr 12, 2017 1:58 pm

I can't wait until we can use lithium polymer batteries. I once jump started my ICE car with a lipo I use to power my quadcopter. My copter often pulls 100+ amps on a punch out. And lipos are super light weight compared to lithium ion.

I'm sure there are a million factors that make lipos unrealistic in an EV, but it would be awesome.

To answer your question. I think if you are asking the question, you most likely aren't qualified to attempt such a feat. I once soldered some 18650s in series for a project and it made me nervous about heating them up. I just cranked my iron up and was in and out of there. Worked fine, but have you seen pictures of what happens when 18650s explode? It's serious business.

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