mitch672
Posts: 1956
Joined: Fri Apr 23, 2010 2:10 pm
Location: Boston, MA

Re: Use of Nissan Leaf battery in Solar installation.

Tue Oct 07, 2014 2:54 pm

offpist, I know you mentioned you didn't want to do this as a business, but if you keep getting salvaged Nissan packs, you could buy them, and safely take them apart, then offer the modules to the DIY community in your area, that want to duplicate the clever storage system you've built. you could even partner with a local solar company, to do the installation work for others.. just a thought.
2012 Advanced Plug in Prius (sold)
I Support OpenEVSE: http://code.google.com/p/open-evse/
My Fuelly page: http://www.fuelly.com/driver/mitch672/prius-plugin
Tesla Model S 85KW Dolphin Grey VIN: 03245, delivered 1/17/2013

offpist
Posts: 33
Joined: Sun Mar 16, 2014 4:26 am
Delivery Date: 23 Apr 1978

Re: Use of Nissan Leaf battery in Solar installation.

Sat Nov 08, 2014 1:31 am

I now got hold of two more battery packs from two crashed cars.
But at the moment I am not going to expand my current setup as I think 30KWH is enough.
So probably I will sell them, and help others build something similar.

mxp
Posts: 711
Joined: Fri Apr 23, 2010 9:32 pm
Delivery Date: 26 Jun 2015
Location: Fremont, CA

Re: Use of Nissan Leaf battery in Solar installation.

Sat Nov 08, 2014 2:35 am

Awesome project you undertook! It looks amazing, and a very clean/neat installation.

Apart from the batteries, how much in total did you spend on the rack, electrical components, connectors, whatever else AWG cables, etc etc?

Cheers.

offpist wrote:I now got hold of two more battery packs from two crashed cars.
But at the moment I am not going to expand my current setup as I think 30KWH is enough.
So probably I will sell them, and help others build something similar.

offpist
Posts: 33
Joined: Sun Mar 16, 2014 4:26 am
Delivery Date: 23 Apr 1978

Re: Use of Nissan Leaf battery in Solar installation.

Sat Nov 08, 2014 2:50 am

Rack, wheels, shelfs and fan: 2000 dollar.
BMS, fuse and contactor: about 1100 dollar
50 mm2 cabling: 220 dollar
Inverter, display, about 4400 dollar.

Prices are only estimates from the top of my head.

Most of this can be done a lot cheaper.. especially the rack parts as its easy to find cheap on second hand marked.. Its standard server rack components.

There are also cheaper BMS solutions out there.
I chose this one, as I wanted the CAN interface.

mxp
Posts: 711
Joined: Fri Apr 23, 2010 9:32 pm
Delivery Date: 26 Jun 2015
Location: Fremont, CA

Re: Use of Nissan Leaf battery in Solar installation.

Sun Nov 09, 2014 11:33 pm

Thanks for sharing the costs.

Again, I am very impressed with the "clean" and professional looking project implementation. I LOVE the way the batteries are rack mounted into server racks! ;-) Definitely a touch act to follow.



offpist wrote:Rack, wheels, shelfs and fan: 2000 dollar.
BMS, fuse and contactor: about 1100 dollar
50 mm2 cabling: 220 dollar
Inverter, display, about 4400 dollar.

Prices are only estimates from the top of my head.

Most of this can be done a lot cheaper.. especially the rack parts as its easy to find cheap on second hand marked.. Its standard server rack components.

There are also cheaper BMS solutions out there.
I chose this one, as I wanted the CAN interface.

User avatar
hill
Gold Member
Posts: 1865
Joined: Wed Apr 21, 2010 4:05 pm
Delivery Date: 27 Mar 2011
Leaf Number: 0659
Location: Lake Forest, CA

Re: Use of Nissan Leaf battery in Solar installation.

Mon Nov 10, 2014 8:30 am

offpist wrote:Thanks for the feedback.

Now I am just sitting at the office watching the battery pack charge.
This morning it was 10% SOC, and now it is 80%SOC(14:00).. should reach 100%SOC by 16:00.
It works flawless and automatic, no need to human input.

If i can get my hand on one more battery pack I might consider expanding.
Salvage yards are going to be more popular than ever!
:D
P.V. battery backup systems I've seen folks build around our 2nd home in Montana are lead acid - so the thought of no off-gassing fumes / venting requirements would be a real JOY - not even considering the power to weight improvement.
.

wongfeihong187
Posts: 60
Joined: Wed May 14, 2014 1:38 pm
Delivery Date: 14 May 2014
Leaf Number: 334861

Re: Use of Nissan Leaf battery in Solar installation.

Mon Nov 10, 2014 1:45 pm

I am very impressed with your skills offpist. Like you said, you thought of it and you did it! Wow!!! Great work. Enjoyed your enthusiasm and the ability to get it done. Continue with your "hobby" :D

sub3marathonman
Posts: 296
Joined: Wed Nov 03, 2010 11:57 am
Delivery Date: 31 Mar 2012
Location: Bartow, FL

Re: Use of Nissan Leaf battery in Solar installation.

Sat Nov 15, 2014 7:29 am

offpist wrote:Yes, but now I am using almost 1,5 battery pack, total of 70 modules.


As others have said, very impressive.

offpist wrote:Each module has two cells, so its only 7 modules in series and 6 in paralell.
Then I can use 42 of the 48 modules from the battery pack.


I'm wondering about the parallel / series connections for the new setup with 70 modules.

And, at least with lead acid, it is undesirable to have parallel connections. Are these cells able to remain balanced with so many parallel cells? And what would be the maximum number that could be connected in parallel? Or would it be better to parallel two 48V packs, with their individual pack cells of 6 parallel?

Has the monitoring showed that cells are remaining balanced over time, or are they needing to be balanced on a regular basis? I ask because there is a debate on another forum about whether LFP cells need a battery monitoring system or not when used in solar PV installations. And of course, the Nissan cells are a different lithium chemistry.

Kris1
Posts: 46
Joined: Fri Feb 28, 2014 10:38 pm
Delivery Date: 30 Sep 2013
Leaf Number: 200165
Location: Sydney Australia

Re: Use of Nissan Leaf battery in Solar installation.

Sun Nov 16, 2014 12:23 am

Impressive effort. I'd be interested in purchasing the battery case/electronics if any of them are from a 2012 vintage Leaf. I'd really like to assemble a pack with more range for my 2012 model Leaf using higher capacity cells but need a swap out case to try the idea because I don't want to tinker with my current pack

offpist
Posts: 33
Joined: Sun Mar 16, 2014 4:26 am
Delivery Date: 23 Apr 1978

Re: Use of Nissan Leaf battery in Solar installation.

Sun Nov 16, 2014 3:07 am

Lithium batteries can be put together in parallel in very endless numbers.
Just look the Tesla battery.

If i were to change it in to two strings of 5 in parallel, i would need two BMS`s.
Would not make any sense.

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