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So It Begins
#11
That's what I've been missing - a forklift!   Jealous of others getting their megachargers,  jealous of forklifts...  but so cool, what an indicator of a 'serious' DIY powerwall Smile
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#12
Quote:Purchased 3 nissan leaf batteries from Big Battery for my power wall build.

Unless you can confirm the SoH and miles of the donor vehicle, make sure you capacity test each module. If you dont you'll likely find an annoying capacity mismatch when you assemble them into parallel cell packs, and start discharging them.

Dont expect the Leafmons to manage the capacity mismatch after you've built the battery.
OffGridInTheCity, Heilopilot, 100kwh-hunter And 1 others like this post
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#13
My forklift is pretty handy, I'm to old to be working off the floor. Picked the forklift up at a school board auction for 101.00 dollars ,battery was shot they had to sell no ROPS . Been using 6 volt golf cart batteries on my 3 set, never purchased new batteries always blems. Forklift is a Atlas Chambers 36 volt 3000 lb capacity.
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#14
(09-28-2020, 10:39 PM)Heilopilot Wrote: My forklift is pretty handy, I'm to old to be working off the floor. Picked the forklift up at a school board auction for 101.00 dollars ,battery was shot they had to sell no ROPS . Been using 6 volt golf cart batteries on my 3 set, never purchased new batteries always blems. Forklift is a Atlas Chambers 36 volt 3000 lb capacity.

You could put in some of the Leaf cells into the forklift?  Would still require the weight of the Lead, though.
Facing similar situation with the forklift at my work.
Modular PowerShelf using 3D printed packs.  60kWh and growing.
https://secondlifestorage.com/showthread.php?tid=6458
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#15
I like William of New Zealand build for leaf PW was going to build 2 packs but after seeing his I am going that way.Not reinventing the wheel here,a lot of people have done a lot of hard work working things out in these systems and I'm just picking the ones that I like. Doing some testing on cells now to get a handle on capacity and voltage drop. I'm going to mix the cells 1 2 3 1 2 3 equal amount from each pack for each stack to try to keep them equal . There should be a weak cell in each of these batteries, must be a reason they took them out of car.
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#16
(09-29-2020, 12:46 PM)Heilopilot Wrote: There should be a weak cell in each of these batteries, must be a reason they took them out of car.

If they were purchased from a vehicle breakers or scrap yard there's a chance they'll come from vehicles that have been written off.  I only purchase batterys that are allready out of a vehicle if I can plug in and confirm the mileage and SoH.
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#17
(09-29-2020, 01:43 PM)Sean Wrote:
(09-29-2020, 12:46 PM)Heilopilot Wrote: There should be a weak cell in each of these batteries, must be a reason they took them out of car.
That's is a good way to do it. What do u end up paying for a complete battery that way? I read some where Big Battery purchased 2000 of these batteries from Japan from Nissan and this is what made for the great prices.
If they were purchased from a vehicle breakers or scrap yard there's a chance they'll come from vehicles that have been written off.  I only purchase batterys that are allready out of a vehicle if I can plug in and confirm the mileage and SoH.
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#18
Used my press on some copper tubing 1 inch 3/4 inch and 1/4 inch ,not sure about the results. I'm going to go a different way. 
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#19
Sold my Outlaw Wing Kart , wanted to put a electric motor system on it just way to much money to do it. Someone in Georgia is working on a build. Gives me a couple more bucks to maybe buy another battery.

Noticed on William's battery build there was spaces between stacks of cells, this is from the base plates from the small group of cells on each side. I have some 1/4 inch threaded rod to keep cells compressed, changed the threads on the one end to match mm threads on plates. 10 inch pounds of torque for compression on cells I read somewhere, thats like hand tight. My torque wrench indicated 15 foot pounds when I removed bolts. Any thoughts on this ? 
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#20
The module mounting holes are sleeved, you can't over compress the modules if you use the OEM mounting frames and threaded rod.
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