Tesla car battery as source of 18650 storage system

1. Are the balancing wires incorporated in these batteries.
2. Can I charge them from solar array
3. Do they need special voltage to charge
4. I have quite a few items that run on 12v in preparation for solar thinking that I would run direct instead of losses through inverter- good idea or not?

Nessiepest said:

Hi Guys,
Whilst I am in Australia at the moment, I have a project at our holiday Villa on the Turquoise coast of Turkey. Solar in still in it's infancy in Turkey despite having 300 days of sunshine. Chinese C-SUN PV panels are now made in Istanbul and there is, theoretically a feed in tariff. However, in typical Turkish fashion it has not been fully implemented. SO my project is to fit PV panels this autumn/winter. I had been looking at various battery storage system when I stumbled upon the use of 18650 Li-ion "Powerwalls"
Time being a factor for me I wonder if there was experience out there on using Tesla Model S 90D batteries. I can get these in Europe with very few "miles on the clock" hence do not need to fly them anywhere

1. Are the balancing wires incorporated in these batteries.
2. Can I charge them from solar array
3. Do they need special voltage to charge
4. I have quite a few items that run on 12v in preparation for solar thinking that I would run direct instead of losses through inverter- good idea or not?

Generally, I am looking for guidance

Cheers
Tom

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DanLim said:

There's some video to show how to Teardown Tesla power pack. You need to check the voltage on the Tesla pack before you can use it. The BMS should be different compare to what you need.
For solar, you need to confirm what's your MPPT or Grid Inverter you'll be using.. that'll define your no of solar panel you need and the battery voltage and capacity.

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The-J-Man said:

Nessiepest said:

Hi Guys,
Whilst I am in Australia at the moment, I have a project at our holiday Villa on the Turquoise coast of Turkey. Solar in still in it's infancy in Turkey despite having 300 days of sunshine. Chinese C-SUN PV panels are now made in Istanbul and there is, theoretically a feed in tariff. However, in typical Turkish fashion it has not been fully implemented. SO my project is to fit PV panels this autumn/winter. I had been looking at various battery storage system when I stumbled upon the use of 18650 Li-ion "Powerwalls"
Time being a factor for me I wonder if there was experience out there on using Tesla Model S 90D batteries. I can get these in Europe with very few "miles on the clock" hence do not need to fly them anywhere

1. Are the balancing wires incorporated in these batteries.
2. Can I charge them from solar array
3. Do they need special voltage to charge
4. I have quite a few items that run on 12v in preparation for solar thinking that I would run direct instead of losses through inverter- good idea or not?

Generally, I am looking for guidance

Cheers
Tom

Click to expand...

Check out this thread on TMC:https://teslamotorsclub.com/tmc/thr...th-a-model-s-battery-pack-at-the-heart.34531/
Tesla packs are built out of 16modules of batteries (85,90,100 packs) or 14 modules (60,70,75 packs).
Each pack is 22.2V (6s configuration and either74 or 86 cells in parallel, 64cells in parallel for 60, 70, 75packs)
Technically you can just hook them up in a 12s configuration. So 2 modules in series and then 8 in parallel. That would give you (incase of the 90D pack) a 44.4V nominal pack with81.4kWh of useable capacity.
1. Each module has its own BMS with balancing. I doubt you will be able to access the BMS though. (check the thread I linked)
2. Yes you can with a solar charge controller (again check the thread for how he did it)
3. 1 module is 22.2V. A Li-ion solar charge controller should be able to be configured for this voltage (or 44.4V if 2 modules in series)
4. They would need to be 12V DC devices for them to work straight of a 12V battery. But as the modules are 22.2V they will not. Place the modules 2 in series for 44.4V and then use a inverter to convert to AC. With 80kWh of capacity I dont think you need to worry much about a few percent of efficiency losses by converting to AC.

Also check out this video where they access the BMS:

Now I have a question though!
Where can you get those packs from? ive been looking and I have found none!!! I really want to buy one!

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Nessiepest said:

Hi J-Man,
Thanks for the info. The modules were available in Belgium already stripped down. Road is probably only way shipping them.

Tom

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