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Nice work! Over here in the US that case is sold as a Ridgid brand. I bought one and fully intended to make a portable power box like this... 3yrs ago. :p

Better than Pacman, it's Battman!

It's probably fine with the small current draw, but to optimize it you could have one copper strip for the pos/neg but put them at opposite ends of the pack.

I double-checked and it's fully seated. There's some silicone on it so that messes with the visual a bit.

I finally finished the powerwall (as much as any project is 'finished'!). At first I thought about horizontal plates to mount things to, but ended up with din rails front an back to mount the BMS' and breakers, and help secure the packs together. The smaller bus bars also got replaced with two...

I haven't tried either of these but just did a search and found a couple places to check out: https://s.click.aliexpress.com/e/_AeUJNy https://s.click.aliexpress.com/e/_AFm3M6

I found a guy selling the factory busbar pieces and picked up enough to finish the rest of my packs; got that done an all the packs charged to 52v / 3.71v per cell. Then several hours of soldering later, I had balance lead splitters wired up and balance leads installed on each pack:

Ask Korishan what he's been doing with the cells stuffed in his closet for the last four years. :LOL:

Slight problem - Those metal tabs a few pics up are the bus bars for each pack, and since the cell layout changed, I'm using twice as many tabs as what originally came in each pack, so I've only been able to finish seven. I hadn't done this before and just measured them; they're only 1/32...

One battery set complete! The first one always takes the longest so I'm sure the rest will just be like 20 minutes or so.

I did the best job I could at slacking tho! Today was spent charging a couple packs and working on the bus bar covers / wiring. They were 21s before so a lot of the balance leads could go along with a few temp sensors (I left one sensor in the middle). At first I figured I'd have Anderson...

Back from the dead - after idling all winter I finally got to arranging all the packs in 7s3p. Now to re-work the bus bar covers / wiring and wire up the BMS leads.

I got an iCharger x8 to test my 25Ah cells in batches of seven. ~5.5hrs to test about 125Ah at a time and it's been rock solid.

I picked up a 24U server rack to house everything including a 48v APC 2200 UPS that I got for free from work. With two charged 7s batteries, it was time for another test but first I decidedto make some hot chocolate:

I got some ends in and shortened up the wiring: And while it was sitting there, why not do a little testing? Battery-powered fridge: It has 6ga and 120A connectors from UPS battery packs I got from work when we de-commissioned a server room. Just need to create 9 more and wire up...

Done!

I set up one 7s3p pack from each Ford battery to rotate out and test all the cells with an iCharger x8 that'll let me do regenerative discharging during the tests: I've been charging them as needed with a couple 245W panels To limit the tests I've done them in batches of 7...

Over the summer I switched from working on an 18650 powerwall to one with EV batteries. In looking for packs that could be broken down to one or two cells I found the Ford Fusion Energi and C-Max Energi packs that came 25Ah cells, so I bought three of those and got to work tearing them down...

Yea the smaller pack is from standard models and has 5.5Ah cells for a 1.4kWh total. The bigger pack is from the Energi models with 25Ah cells for a 7.6kWh total.

Since each section has 21 cells, I'm setting them up as 7s3p. The cabinet they're going it can hold two sections per shelf, so I'll be putting two in series for 14s per shelf, then paralleling each shelf. Pretty sure I'll be going with Batrium to manage it. Should've started my own thread a...