EVE 230ah 16s build

[No.15]

Went with 230 cells on my build because of space issues. I am going to post capacity tests etc to this thread. I pick them up tomorrow.

Initial setup I'm thinking will look like this



Does that look OK? Bms will be rec bms. I am also going to compress the cells with boards and threaded rod. Still have to figure that out.

 

[No.15]

got the cells today
Some pics




Packed laying on their side. I am used to cells standing up.


Slightly taller than my EVE 280n cells


Not as wide, which is what I needed

 

[No.15]

Going to charge and load test each cell. I am going to break out my big load tester, it can do 300a discharge, although I would probably for this test at .5c or maybe 150a. To tired to start tonight though.

Voltage

Quick resistance test (no sense wires setup)


Here is the discharge cap, voltage and resistance from factory

242508.2

3.2965

0.189

 

[42OhmsPA]

Where did you order from? I need more... Those new terminals are nice looking.

What's the footprint of your proposed configure vs straight line? I'd imagine the bus bars will be a pain in your layout...

 

[No.15]

Where did you order from? I need more... Those new terminals are nice looking.

What's the footprint of your proposed configure vs straight line? I'd imagine the bus bars will be a pain in your layout...

Got these from 18650.

Funny with my layout I have posted above I think I would prefer the old style terminal. I am going to do some testing and see what I can come up with.

 

[No.15]

Where did you order from? I need more... Those new terminals are nice looking.

What's the footprint of your proposed configure vs straight line? I'd imagine the bus bars will be a pain in your layout...

Are you using ratchet straps there? Good idea, I have been thinking of ways to compress my cells.

 

[42OhmsPA]

Are you using ratchet straps there? Good idea, I have been thinking of ways to compress my cells.

I was going to use ratchet straps, they are just lashing straps I synched tight at a low SOC. I was back and forth on an actual compression rig and settled on the KISS method. Some members gave me flack in the compression thread, I know others are using a similar setup.
Things have been fine since October.

Got these from 18650.

Funny with my layout I have posted above I think I would prefer the old style terminal. I am going to do some testing and see what I can come up with.

Thanks for confirming, I've had them in my cart at 18650 a few times now...

 

[No.15]

Testing one of my 280ah EVE cells that I have had for years. This is from the batch that sat unused in the weather for a couple of years. Heat mostly but it did see some below 0 F days recently.

Anyway I wanted to do some test runs and just play around with some of my stuff. I am getting my new shop built out so I am kind of disorganized.

I have this Kunkin load bank I am using right now. Look at these voltage fluctuations, I wonder what is going on? I am going to discharge this one as far as it will go, recharge and test again. Running test at 30 amps. Wonder if this is a wire issue.



Here is the resistance test before I started the load test.

 

[No.15]

So going over my test setup and I spotted an issue. I think my serial cable was lose and was losing connection. At least that is what I think.

 

[No.15]

This on finished. I am going to recharge and test it again. It recovered to 3.126v overnight

 

[No.15]

? I let the magic smoke out

 

[No.15]

First 230a cell test complete. I had to use the Kunkin tester because my big tester obviously is not working

232.29 Ah, 742.41 Wh. This cell was charged to 3.60V and discharged to 2.50V

 

[No.15]

Cell 2. I took this one to 2.6 instead, and honestly I'll probably raise it to 2.7 in the future.

234.25Ah, 749.454 Wh. Cell was charged to 3.62
.22 mohm

 

[No.15]

Out of order. Cell #4 charger to 3.6 discharged to 2.7
.23 mohms

 

[Nobodybusiness]

? I let the magic smoke out

View attachment 144137

What happened? Is that the charger or load bank?

 

[No.15]

What happened? Is that the charger or load bank?

It's a load bank. Initial Investigation I found a vented cap and a bad 5w resistor. When I have time I'll do some more looking.