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

Use of Nissan Leaf battery in Solar installation.

Thu Sep 04, 2014 10:44 am

Hello everybody.
I currently drive an Nissan Leaf, and I am also very interested in Solar systems.
So I started thinking an battery from Nissan Leaf would make a good storage for solar power I normally export to the grid.

So, I got a hold of a battery pack from an wrecked Leaf, and started building.
First of all i had to make it about 48V, and to do that i have to put 14 Cells in series.
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.
This may be expanded with more modules later, we will see.

For battery management i am using this unit:
http://www.rec-bms.com/BMS9R.html

BMS.
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Fuse, contactor and pre-charge unit.
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Some of the connections.
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Shunt.
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LCD panel.
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Comming together.
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From the back.
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Thermostatic controlled fans on top.
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4 pcs M10 bolts on each bank.
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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.

Thu Sep 04, 2014 10:51 am

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Here is a picture how it is connected.

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This video also shows the system well.
Could only find it in german, but the video is self explaning.

https://www.youtube.com/watch?v=9mIDjdnJDwE

Even more info her:
http://www.tritec-energy.com/images/con ... RO_enu.pdf

When connected i should be able to see the status of the battery in Sma Home Manager.
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AlanSqB
Posts: 313
Joined: Mon Aug 04, 2014 5:33 pm
Delivery Date: 26 Jul 2014
Leaf Number: 300613
Location: Fort Collins, CO

Re: Use of Nissan Leaf battery in Solar installation.

Thu Sep 04, 2014 11:15 am

Very cool. Please continue to update.

What SMA inverters are you using? I just found out about the "Sunny Boy" units that can provide 1.5 kW when the grid is down. I wonder how this could work alongside that system.
2015 LEAF SV in Gunmetal Gray
"The only gas in this vehicle comes from the driver."
I drive a LEAF, it doesn't have Ludicrous or Insane mode. It only has Slightly Annoyed mode.

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.

Thu Sep 04, 2014 11:27 am

I will be using the SMA Sunny Island 6.0
http://www.sma.de/en/products/battery-i ... h-80h.html

Ordered it two weeks ago from Germany, but still have not arrived.
(I live in Norway btw)

The BMS has allready been programmed to work on CAN bus with the sunny Island.
So it should be just plug and play when it arrives.

I allready have the SMA Home Manager running with two SB4000TL inverters for two years now.

For now I am using a cheap 6000W China 48V inverter I borrowed from a friend.
It can only work off-grid ofcourse so i am running it on our hot water tank.

Today I charged the battery from 3,4V to 4,12V, About 10%SOC to 100%SOC.

Everything seems to work just fine, and very stable.

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RegGuheert
Posts: 5503
Joined: Mon Mar 19, 2012 4:12 am
Delivery Date: 16 Mar 2012
Leaf Number: 5926
Location: Northern VA

Re: Use of Nissan Leaf battery in Solar installation.

Thu Sep 04, 2014 12:15 pm

Very nice! I wondered who would do this first. Will this become a product?
offpist wrote:The BMS has allready been programmed to work on CAN bus with the sunny Island.
So it should be just plug and play when it arrives.
CANbus? Why does Sunny Island support CANbus?
RegGuheert
2011 Leaf SL Demo vehicle
2011 miles at purchase. 10K miles on Apr 14, 2013. 20K miles (55.7Ah) on Aug 7, 2014, 30K miles (52.0Ah) on Dec 30, 2015, 40K miles (49.8Ah) on Feb 8, 2017.
Enphase Inverter Measured MTBF: M190, M215, M250, S280

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.

Thu Sep 04, 2014 1:04 pm

I have no plans of making more of these for selling.
The CAN bus is simply for communicating with the BMS.
BMS reports SOC, Cell voltage and also error message to the inverter if needed.
BMS controls the relay, so if there is something outside the parameters it will turn the power off.
I am by no means an expert on this, but its all done over this CAN bus.
Safety, and long lifespan if the battery is important.

The Sunny Island supports Lithium batteries, but ONLY if it receives signal from the BMS.
I used a lot of time asking different manufacturers if they made support for SMA, and this one did.

I do have the whole CAN protocol if anyone is interested, pm me.

Everything should be automatic, charging when surplus power is available and discharge when sun has gone down.

Usually i have an self consumption rate at about 50%, but with this system i should reach at least 80%, maybe more.

Not doing it for saving money, electricity is really cheap here.
Just really like the idea. And when i have an idea, i usually go thru with it ;)

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JeremyW
Posts: 1514
Joined: Sun Nov 13, 2011 12:53 am
Delivery Date: 23 Jun 2012
Leaf Number: 19136
Location: San Gabriel, CA

Re: Use of Nissan Leaf battery in Solar installation.

Thu Sep 04, 2014 6:49 pm

CAN bus was developed for cars but it's made its way into industrial uses. PM sent about this "BMS CAN info" which I'm assuming is not the car's original BMS!
Former 2012 SL leasee 6/23/12 - 9/23/15
Now driving Honda Fit EV, License plate: CHADEMO
2000 Honda Insight for long trips

BrockWI
Posts: 527
Joined: Fri Mar 28, 2014 6:28 am
Delivery Date: 28 Mar 2014
Leaf Number: 423875
Location: Green Bay, WI.
Contact: Website

Re: Use of Nissan Leaf battery in Solar installation.

Thu Sep 04, 2014 7:49 pm

I have a xantrex xw6048 and 3000w of panels with a 350a 48v bank. What kind of voltage does it swing from on the low and high side? I would assume it takes big loads nicely given that is what it was intended to do.
3 kw solar pv - XW6048 - 8 L16's
4 ton GSHP
2003 VW TDI 170k miles - 52 mpg lifetime
evse level 2 - Clipper Creek HSC-40
2013 S model with QC package Mar of 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.

Thu Sep 04, 2014 11:37 pm

The CAN bus protocol is designed by SMA (i think) for communicating With the BMS.

I plan on cycle the battery from 3,2V to 4,12V (44,8 to 57,68V).
The Sunny Island operates between 41 and 63V, so this should be just fine.

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drees
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Location: San Diego

Re: Use of Nissan Leaf battery in Solar installation.

Fri Sep 05, 2014 12:24 am

Very nice looking install, offpist - very professional!

How much energy are you getting out of the pack and are you able to provide an estimate for project costs? It looks like the modules cost around $125/ea here in the USA, so the batteries alone would cost over $5,000.

If it were me, I would probably opt to charge to a lower voltage (perhaps 4.05-4.08V / cell) in an effort to prolong battery life, but being in Norway you may not be very concerned about battery life with your cool temperatures depending on how long the pack will sit at max voltage. It may not sit at fully charged for very long since you will tend to pull from the pack shortly after the sun goes down?
'11 LEAF SL Powered By 3.24 kW Enphase Solar PV

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