Rednecktek
Solar Wizard
I'm building the heated 280Ah batteries for my camper. Bog standards are cheap, but when you start needing things like heat or larger capacity or the like, DIY is still the way to go.
Who is still building DIY batteries
- Thread starter JJJJ
- Start date
I'm building the heated 280Ah batteries for my camper. Bog standards are cheap, but when you start needing things like heat or larger capacity or the like, DIY is still the way to go.
Brucey
Solar Wizard
Are the cells taped together for compression? How are they secured?
Partimewages
Solar Addict
Homemade box?
teal95
Solar Addict
I just used mismatched dies. If 70 is a bit loose I use half a 70 and half a 50 (or whatever the next size down is).
Quattrohead
Solar Wizard
Me too.
TommySr
Solar Enthusiast
I just started building a 200Ah 24V battery pack using pouch cells (3.7V) 7S12P
currently have 24V 400Ah LifeP04 2P battery pack
24V 200Ah Flooded Lead 2S8P battery pack
currently have 24V 400Ah LifeP04 2P battery pack
24V 200Ah Flooded Lead 2S8P battery pack
Nobodybusiness
Solar Sponge.
Are you using a single shunt trip breaker or a core for each battery and multiple breakers?
Zwy
Emperor Of Solar
Buy the best, leave the rest.
Temco for me and it works great. Has plus size dies too.
42OhmsPA
What's in a title?
Anyone know what gauge steel these pre-built cases are?
... https://www.harborfreight.com/36-in-bending-brake-with-stand-62518.html
How hard could it be to build your own?
... https://www.harborfreight.com/36-in-bending-brake-with-stand-62518.html
How hard could it be to build your own?
OffGridForGood
Catch, make or grow everything you can.
Just need a brake form bender with the removable sections - to allow the sides of the box to fold up without interferrance with the brake. A 36" model would be enough, but I don't own one. I have a regular 10-foot brake, without the removable sections.
Rednecktek
Solar Wizard
Two levels of the fiber packing tape holds the cells together.
Noco Group 31 box from WallyWorld/Amazon. Not a lot of space in there for the larger lugs but some 2-1/8" nylon washers on the front to eat up some of the thread bought me some working room.
Surprisingly!!
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42OhmsPA
What's in a title?
I remember that thread well, picked up a good bit from it. Made me want to start welding again.
Rednecktek
Solar Wizard
Use thinner steel!! Holy Krap 100+lb before cells HURT to move!
Rednecktek
Solar Wizard
So what advantages do you get from going with the pouch cells over standard LFP prismatic boxes? Or is this just to play with pouch cells?
TommySr
Solar Enthusiast
Rednecktek, I like these pouch cells for a number of reasons.
1) sweet specs for these cells.
Max Charge Rate 240A
Recommend MAX Continuous Discharge Rate 400A
Pulse Discharge Rate（3 seconds） 800A
Fully Charged voltage 4.2V
Discharge cut off voltage 2.5V
2) my inverter's cutout voltage is 21vdc, I can take 7S of these cells down to 20vdc without hurting them.
3) 24vdc 200Ah of these cells cost $600.
Truth be told I treat everything as an experiment, a task, or a game. (that could explain my GF just moving out)
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OffGridForGood
Catch, make or grow everything you can.
I expect the pouch cells are far lighter weight as well.
Made in North Pole
Off-grid Addict
- Joined
- Feb 8, 2021
- Messages
- 101
DIY forever
There is no shunt trip breaker at all. There are fuses on each battery, 1pc 250A breaker for the inverter, 3pcs 80A breaker for the charge controllers, 5pcs 63A circuit breakers for the solar panels. The BMS is connected in a way to be able to switch off charging through the 5 contactors and/or switch off discharging using CAN or the modified inverter power switch, whichever responds first.
May I ask for a link to where you purchased them? I am considering pouch cells for my rv.
TommySr
Solar Enthusiast
johneb
SPIM08HP 3.7V 16AH - Excellent Lithium Ion Power Cells
CELL HOLDERS, THREADED INSERTS, AND BOLTS INCLUDED. YOU CAN BUILD YOUR PACKS WITH JUST A WRENCH. WE HAVE THE BUSBARS FOR SALE AS WELL OR MAKE YOUR OWN. THESE MODULES ARE 3.7V 16AH AND THEY CONSIST OF 2X SPIM08HP 8AH CELLS IN PARALLEL. THERE IS A THREADED INSERT WITH THE BOLTS ALREADY ON. IT...
batteryhookup.com
Murphyslaww
New Member
Once I got to 1.5 years of no issues with powerqueen 12v 200ah batts, I stopped DIY on batts. Takes too much time from the rest of projects. Now that they are down to $475, (or like $450 for lightly used returns) I don't see myself going back unless I get into EV mobility packs at some point. We have six now, and will likely pick up another 4 in a month or so. Not even messing with server rack batts. The powerqueens are working fine for our shed, and our Lightning charger.
Brucey
Solar Wizard
How many 12V 200Ah batteries are you running?
Murphyslaww
New Member
six total, two in the shed that have been going for close to two years, running a 9k btu mini-split, and now these 4 for the truck charger project. We'll likely add another 4 here by March. I don't have to tell you all, how much time it saves.
Just checked prices, and it looks like they are up a bit. $509 for the new, and $484 for the "lightly used". Looks like the used 200ah are sold out, but the 100ah are in stock at $218 per. I have one of those too, and had it in a ryobi Link box rolling mobile generator that would power my Rigid table saw off a Roarbatt 2000watt inverter. I really just got lucky in the beginning of my solar journey in picking cheap, but right with powerqueens and Roarbatt inverters. We have a 4k Roarbatt inverter in the shed, only because we oversized it so the fans rarely come on, as it's my G/F's art studio.
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Dave911
Solar Enthusiast
Only a 10 footer? Jeez. This alone should justify a segmented brake and a TIG welder just for these!
Regards,
Tool Junkie
Zwy
Emperor Of Solar
I have the 4 foot pan brake along with press brake for the 100 ton press. I purchased the finger brake and press brake from SWAG. The finger brake was needed when I built the stainless shower pan for my truck camper. Had to fab up a special bracket for the press with a 50 ton jack on the side to use the finger brake, it was too long to fit in between the uprights. Already had the TIG, used it to weld the stainless.
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