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Old 02-28-2015, 03:57 PM
eric1565 eric1565 is offline
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Default tesla model S module for sale

I have 10 modules for sale. They came from a car with 3300 miles and the VIN # was over 20k. The modules came from a rev B pack. BMS is included with module

Each module has 444 batteries in a 6s74p configuration. 22.2 volts nominal and 233 ah , 5.3kWh.

The modules cost 1900 shipped within the US. Ships from Houston tx

Contact me at 832 453 0532
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Old 03-01-2015, 02:57 AM
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Default Re: tesla model S module for sale

$30k for 16 modules - nice price for used product. Tesla got each module new for almost the half of this price...
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Old 03-01-2015, 07:35 AM
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These cells cost less per kWh than the Chinese cells. They have a much better cycle life than the Chinese cells

A good analogy would be buying new at harbor freight or used Milwaukee hand tools off craigslist. Used but better than Chinese new.
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Old 03-01-2015, 08:30 AM
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Default Re: tesla model S module for sale

Do you know for sure that they have a better cycle life? Im wondering how much capacity has been lost on those Tesla's that have over 35,000 miles. Lets get that information on the board.
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Old 03-01-2015, 09:27 AM
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We are in the process of dissassembling 1 module to get individual cells. We are going to cycle test them and see the capacity. We have done 1 with very simple charge/discharge setup and capacity was around 2.9ah. Will post more info when. Temp of cell was about 40-50 degrees due to outside temps.

We Are not planning to cycle test an entire module due to its large capacity. 233Ah. At 10 app draw it would take about 23 hrs

We have also put one cell into a vaper. .08 ohm mechanical mod and it pulls about 40+ amps for 4 seconds. Cell became a bit warm and the warmth was about the same as his standard cell.
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Old 03-01-2015, 12:49 PM
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Default Re: tesla model S module for sale

I'm still in process of capacity testing one of these modules, I can only do 2.5A. But so far looks good. I'll stop at 3.1V / Cell. Charged to 4.175V.
These are NCA chemistry; Panasonic says 2.5V under load. But this is a pretty small load so ill stop higher.

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Old 03-01-2015, 12:55 PM
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Default Re: tesla model S module for sale

double post

Last edited by okashira; 03-01-2015 at 01:09 PM.
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Old 03-01-2015, 01:02 PM
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Default Re: tesla model S module for sale

Quote:
Originally Posted by eric1565 View Post
We are in the process of dissassembling 1 module to get individual cells. We are going to cycle test them and see the capacity. We have done 1 with very simple charge/discharge setup and capacity was around 2.9ah. Will post more info when. Temp of cell was about 40-50 degrees due to outside temps.

We Are not planning to cycle test an entire module due to its large capacity. 233Ah. At 10 app draw it would take about 23 hrs

We have also put one cell into a vaper. .08 ohm mechanical mod and it pulls about 40+ amps for 4 seconds. Cell became a bit warm and the warmth was about the same as his standard cell.
I got 3.02Ah stopping at 2.55V with 10A load (>3C) That was with a 100ma cut charge, Tesla uses a 50ma cut, so a little more capacity. And 10A load is pushing these cells to the limit.
I did 3 cycles repeated at 10A each and capacity actually increased with each cycle. (By ~0.06%) 10A continuous is a pretty heavy draw for these cells, they do get hot by the end.
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Old 03-01-2015, 01:42 PM
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Default Re: tesla model S module for sale

When we have an actual graph of cell capacity after you put on about 1500 cycles then I will consider if they are better than the current available cells.

Id love to have a full Tesla pack but just can't yet get over the price some are trying to sell them at. I don't think they are worth $20k.

Good luck selling them off at that price. I know the price point for these should be higher than the current Leaf modules but until we get actual data Im going to remain skeptical. Remember I have driven a Leaf for nearly 4 years now and I don't live in Arizona and I was getting some serious range loss even after that short of time. Battery pack was warranted for 8 years and no more than 33% loss of original capacity after 8 years. I was at 24% or better loss only after 3 1/2 years. Go figure. This is real world driving in a real electric car. Im hoping the new chemistry will do better. If not Im out of the EV game until the batteries get better. I'll give it a real solid 7 years total of real every day driving. It will be a testament of either a great thing or not.

Bust that price by a 1/3 and I'd be game for the entire pack. I think that would be fair.
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Old 03-01-2015, 01:44 PM
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Default Re: tesla model S module for sale

Single cell testing is fine. Easier to do and easier to control temps. It would give a good indication of real world expectations. With single cells you can better duplicate normal every day driving and amperage during driving and be consistent with charging too.
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