Nissan LEAF or Tesla car batteries?

Started by sidpost, March 18, 2021, 01:31:41 PM

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My initial search turned up older posts so, here goes ...

Is buying an "out of service" Nissan LEAF or similar EV automobile a viable way to get a good reliable battery bank compared to a Generac or Tesla "Power Wall" solution?

Considering cars like that have a low center of gravity, finding a roll-over vehicle at an auction is probably unlikely.  Then, I wonder about the value of a car that is at its end of life?  How much battery life is left?

Soldering thousands of cells together isn't an option for me either!   ::)   Even though I 'could' do that, my time has some value so I'm thinking more along the lines of harvesting large battery packs to be repurposed versus a "Power Wall" or L16HC solution.



If you just want a good battery pack for solar you are probably better off buying new LifePo4 lithium  batteries.
Why pay for the rest of the car ?
Steve was talking in a recent post about the economics of the lithium from a supplier he trusts and a new BMS with lots of capabilities.
I also just saw video by a ham radio operator and he discusses lots of options using EV and Hybrids as well as solar .

48 Nov 12, 2020    Emergency Solar power    Bob Bruninga, WB4APR     
View Video   


system 1
Classic 150 , 5s3p  Kyocera 135watt , 12s Soneil 2v 540amp lead crystal for 24v pack , Outback 3524 inverter
system 2
 5s 135w Kyocero , 3s3p 270w Kyocera  to Classic 150 ,   8s Kyocera 225w to Hawkes Bay Jakiper 48v 15kwh LiFePO4 , Outback VFX 3648 inverter
system 3
KID / Brat portable


People are indeed using recycled EV Batteries for their solar systems but there are many caveats to doing so. 
1)  The voltage curves are typically outside of the normal scope for Solar Equipment depending on the chemistry.
2)  EV Batteries are more volatile, they CAN Catch fire and explode, LFP (LiFePO4) does not.
3)  SOURCE:  are they from a wreck or warranty replacement ?  Is each cell in "perfect" condition & TESTED ?  Only takes one to cause issues.

Watch this for more clarity on chemistry differences:

Using 24V for example, as Tesla Modules usually come broken down to 24V modules.
Tesla Model S battery module, 24V, 250Ah, 5.3kWh 12kW, 444 Panasonic 18650 cells:
The modules consist of 444 Panasonic 18650 cells of about 3400 mAh nominal capacity.
The cells are configured 6s74p, Voltage range for the whole module is about:
18.6V soc 0%  -  23.1V soc 70%  -  24.9V soc 100%
capacity ~250Ah, ~5.3kWh

LFP - 24V/280AH/7.168 kWh  (8x280AH LFP cells in Series)
0% SOC = 20.0V,  100% = 29.2V
1C Discharge Rate at 280A Max, 0.5C Charge Rate at 140A Max.

EVE Grade-A "Factory Matched & Batched" 280AH cells, 8 pcs:  $1,016.00 USD delivered to USA DDP
Duty Taxes & fees paid.  ** You must have a "Chat or messenger to get accurate S&H quote (usually a bit less).
LINK to Vendor:

Attached is a Tech Doc on configuration, assembly etc related to LFP  and a Voltage Chart for LFP

Hope it helps, Good Luck.