DumFume 300Ah 12v Battery Cells in a Yixiang Stackable 48v DIY v2 Box

[crezno]

In case if anyone was wondering if its possible to buy DumFume 300Ah Batteries, cut the tops off, remove the cells, and prep them to be used in a Yixiang DIY box, well you came to the right place.

Yes its possible, and it went reasonably well. Except for one mishap of creating a small accidental short which my own fault.

I had heard that the 300Ah Dumfume batteries had EVE 280Ah cells. The LF280K, so I had a few already from projects, but had ordered a few more in order to make 2 of these battery packs. I completed 2 and working on more. I have opened 10 batteries and have the following cell results.

1x EVE 280AH LF280K
1x Envision 305Ah
8x Trina Storage 314Ah

The below battery box is made with the 314 Cells since they matched.

The cells are already laser welded, so I was only able to use busbars on the 3 connecting points of the 4 cell packs, but I made it work. I was able to slip the separators in between the cells and tape up the side a little with kapton just in case a cell wanted to ground out since the siding had a few small knicks in them. Been testing fine. Actually had to put an extra space in the box to add a little more pressure.

Also was able to use stock screws to attach the ring terminals for the balance leads with a small washer without having to tap or solder anything.

 

[Meilyn22]

DumbFume 300AH costs $300+. Buying 4 would cost you over $1200. 16 cells of 320AH EVE batteries are less than this price if you find a good seller.

Just wanting to know what the economic value is to doing this. Except you already have the batteries and want to stop fighting with balancing issues. Or you are getting them pretty cheap on Temu.

 

[crezno]

I have bought every dumfume off Temu and consistently get them under $200. Its cheaper than buying the cells outright. The BMS in these units are actually useful if you needed to use them to build other packs as well.

 

[Meilyn22]

I have bought every dumfume off Temu and consistently get them under $200. Its cheaper than buying the cells outright. The BMS in these units are actually useful if you needed to use them to build other packs as well.

Do you use different accounts to do this? The way they do their $100 back would have amazon shut down if they tried that.

Very scammy. You get them in chunks and have to buy more to get more.

 

[crezno]

No, but the offers come and go. When i get a notification for the deal, i start buying. I have had it up to $180 off $300 with a $20 circle credit.

 

[CJ Solar]

In case if anyone was wondering if its possible to buy DumFume 300Ah Batteries, cut the tops off, remove the cells, and prep them to be used in a Yixiang DIY box, well you came to the right place.

Yes its possible, and it went reasonably well. Except for one mishap of creating a small accidental short which my own fault.

I had heard that the 300Ah Dumfume batteries had EVE 280Ah cells. The LF280K, so I had a few already from projects, but had ordered a few more in order to make 2 of these battery packs. I completed 2 and working on more. I have opened 10 batteries and have the following cell results.

1x EVE 280AH LF280K
1x Envision 305Ah
8x Trina Storage 314Ah

The below battery box is made with the 314 Cells since they matched.

The cells are already laser welded, so I was only able to use busbars on the 3 connecting points of the 4 cell packs, but I made it work. I was able to slip the separators in between the cells and tape up the side a little with kapton just in case a cell wanted to ground out since the siding had a few small knicks in them. Been testing fine. Actually had to put an extra space in the box to add a little more pressure.

Also was able to use stock screws to attach the ring terminals for the balance leads with a small washer without having to tap or solder anything.

View attachment 330011

I am grateful for you trying this. I was going to modify an aluminum cargo box but just could not find what i was looking for. Did you put the four pack of cells in as a compressed unit? Or did you cut the banding and remove the steel plates from the ends?
Thanks
CJ

 

[crezno]

I am grateful for you trying this. I was going to modify an aluminum cargo box but just could not find what i was looking for. Did you put the four pack of cells in as a compressed unit? Or did you cut the banding and remove the steel plates from the ends?
Thanks
CJ

Good question.

Actually I did both. However, in the end im going to use the insulating sheets. Its super temping to put them in as is because they are already mostly compressed. and its done for you.

If you cut the banding, you remove the metal plates, it will remove a good 5-8 lbs of weight across 4 packs, those plates are heavy. But also, youll notice that the insulator sheet is a hollow rectangle. I am curious as to why they did this, but im assuming its because they wanted to allow the center of the packs to swell slightly, or worse, perhaps they were using already swelled cells. None of my cells were swollen, but I didnt like that they were hollowed out, because if the cells did swell, they may be able to swell into each other and perhaps ground out if the casings tore somehow. If the sheet was solid and not hollowed out, I would have felt confident in just slapping them in banded together.

 

[CJ Solar]

Good question.

Actually I did both. However, in the end im going to use the insulating sheets. Its super temping to put them in as is because they are already mostly compressed. and its done for you.

If you cut the banding, you remove the metal plates, it will remove a good 5-8 lbs of weight across 4 packs, those plates are heavy. But also, youll notice that the insulator sheet is a hollow rectangle. I am curious as to why they did this, but im assuming its because they wanted to allow the center of the packs to swell slightly, or worse, perhaps they were using already swelled cells. None of my cells were swollen, but I didnt like that they were hollowed out, because if the cells did swell, they may be able to swell into each other and perhaps ground out if the casings tore somehow. If the sheet was solid and not hollowed out, I would have felt confident in just slapping them in banded together.

Thank you for the follow up, great information. Was it difficult to handle the 4 cells without the banding? Did you put them in the Yixiang DIY box and then cut the banding?

 

[crezno]

Thank you for the follow up, great information. Was it difficult to handle the 4 cells without the banding? Did you put them in the Yixiang DIY box and then cut the banding?

Cut the banding not in the case. peeled off the side foam, separated the cells enough to slip the foam pads in between, then used some kapton tape to tape them back together, then slipped them in the case. I put 1 metal plate at the front and back because it seemed like the cells were slightly too narrow. I bottomed out the compression plate and felt it could be tighter, so I through a plate in the front and back to give it a little more compression. Probably not necessary but I did it.

The welds are pretty strong so pretty easy to handle with the bands cut. Just dont bend them too far.

 

[CJ Solar]

Cut the banding not in the case. peeled off the side foam, separated the cells enough to slip the foam pads in between, then used some kapton tape to tape them back together, then slipped them in the case. I put 1 metal plate at the front and back because it seemed like the cells were slightly too narrow. I bottomed out the compression plate and felt it could be tighter, so I through a plate in the front and back to give it a little more compression. Probably not necessary but I did it.

The welds are pretty strong so pretty easy to handle with the bands cut. Just dont bend them too far.

To be sure I am looking at the correct box, is this the one you used?

China YIXIANG V2 15Kwh Battery Diy Kit Box With JK 200A V19 BMS LiFePO

yixiangnewenergy

yixiangpower.com

Thanks for the great info!

 

[crezno]

I purchased the US Stock, took 3 days to get to me. They will all work if they say 280/305/314 because these cells have the same dimensions. But the different boxes come with different screens and such. But yes thats the one I got, just the USA stock version.

 

[CJ Solar]

Thanks, I found the US stock version.

 

[monkeyz47]

DumbFume 300AH costs $300+. Buying 4 would cost you over $1200. 16 cells of 320AH EVE batteries are less than this price if you find a good seller.

Just wanting to know what the economic value is to doing this. Except you already have the batteries and want to stop fighting with balancing issues. Or you are getting them pretty cheap on Temu.

I’ve got my last 8 dumfume 12v300ah for less than $150 each. My last 2 orders were a 12v300ah for $300 that I got $236 PayPal refund on. 4x 300ah cells for less than $70.

*edit to add yeah these are gaming the Temu coupons