diy solar

diy solar

Our NEW GO-TO LiFePO4 vendor...09.20.21

I wonder if high conductivity glue would be a solution? I’d probably want a refund on that cell before I attempted.
 
Tap it. It's really not all that hard. If you have never done it before watch a video on the subject.
 
Yeah, I'd tap that.
banana2.gif
 
Lol. Yeah, tapped it, grub screw locktited in, it’s solid.
Why are these terminal screws so tiny? M6? They should be at least M8.
 
The terminal is stepped, with a shoulder, so the mating surface for the lug is also very small. I’m going to have to source lugs with a 1/4” hole.

I only need 60-80A thru-put so I’m not too worried about it. If I had a 2000W inverter I surely would be, although it’s probably ok anyway.
 
Broke out the new power supply last night, installed all of the grub-screw terminals, hooked the cells up parallel, and put the charge on them, initially to 3.4V. They've been on for over 18 hours and have only gained about 2 tenths of a volt. LOL They started out drawing about 9A, now down to 5.

I'm doing the step method - to 3.4V and rest, then 3.5 and rest, then 3.6, call them balanced. I'm guessing the second and third steps will go quicker.

So far so good...

 
Browneye said:
Broke out the new power supply last night, installed all of the grub-screw terminals, hooked the cells up parallel, and put the charge on them, initially to 3.4V. They've been on for over 18 hours and have only gained about 2 tenths of a volt. LOL They started out drawing about 9A, now down to 5.

I'm doing the step method - to 3.4V and rest, then 3.5 and rest, then 3.6, call them balanced. I'm guessing the second and third steps will go quicker.

So far so good...

Click to expand...
It takes the LF280N between 70-76 hours to parallel top balance with a 10amp power supply.
 
Browneye said:
Why are these terminal screws so tiny? M6? They should be at least M8.
Click to expand...
My guess is that these cells are designed are to be implemented in battery packs with fully welded connections/bus bars. I can’t imagine an industrial use of these cells would have any sort of threaded connection with such weak method.

These studs or serviceable connections are an afterthought to unload cells on the DIY market

Again just my thought.
 
740GLE said:
My guess is that these cells are designed are to be implemented in battery packs with fully welded connections/bus bars. I can’t imagine an industrial use of these cells would have any sort of threaded connection with such weak method.

These studs or serviceable connections are an afterthought to unload cells on the DIY market

Again just my thought.
Click to expand...

And why the sockets are laser-welded on after they're manufactured.
From what I can tell it will all work out fine. I sourced lugs with 1/4 holes and they fit nicely and have plenty of mating surface to the terminal.
 
What is the largest cells Jenny or Docan can supply. i can't seem to find out. on Alibaba there site hints to 500, 450 ect but no direct info.

PS. ghostwriter66, "RF Engineer goddess extraordinaire" I whole heartedly agree and Jenny Wu also. both smart and hot. (sorry for being truthful.)
and thank you both for all the info presented.
 
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Maintenance guy said:
What is the largest cells Jenny or Docan can supply. i can't seem to find out. on Alibaba there site hints to 500, 450 ect but no direct info.
Click to expand...

280 is the largest listed on the new website :

www.docanpower.com

DOCAN POWER

Brand New High Quality LiFePO4 Battery Cells SupplierDocan is TOP10 battery and battery suppliers in China. We supply TOP1 service of Lifepo4 Prismatic Cell and Battery Pack for variouse area, 12 years+ focus on high capacity, high wattage, high voltage, high dicharge current battery cells and...
www.docanpower.com www.docanpower.com

Edit: as you can see in the post below they have 304. Guess I didn’t look close enough. ?
 
Last edited:
Maintenance guy said:
What is the largest cells Jenny or Docan can supply. i can't seem to find out. on Alibaba there site hints to 500, 450 ect but no direct info.
Click to expand...
Why not ask Docan directly?

AFAIK, the largest aluminum cased prismatic cells anyone can supply (to retail customers) is 304Ah (EVE) or 302Ah (CATL), I believe Docan carries both, and I believe any seller saying they can supply cells above that should be treated with extreme skepticism, until you see a real manufacturer datasheet and model number. Cells advertised above 304Ah at this current moment in time are probably being misrepresented (whether that is the common mild misrepresentation of "rounding up" 302-304 to 310-320, or outright fraudulently advertising 400+ Ah cells that just are not available yet).

You can get cells above 400AH, if you go with the older, larger, and more physically robust but less energy dense nylon cased prismatic cells from companies like CALB/Winston/GBS/Sinopoly. Winston makes cells up to 1000Ah, but they cost an arm and a leg through legitimate channels.

From my research, the most energy dense cells at the moment are the EVE and CATL ~300Ah cells, and the CALB, EVE, and ETC ~230Ah cells. And the current ceiling for aluminum prismatics is around ~300Ah from what I've seen. But the market/manufacturing process is continually evolving, a year or two back ~280 was the maximum we saw for aluminum prismatics, today its ~300, tomorrow who knows.
 

Plastic Grade A Lithium Ion Batteries 600ah 500ah 400ah 300ah 200ah 3.2v Prismatic Lifepo4 Battery Cell For 48v Storage Pack - Buy 500ah Grade A Lifepo4 Prismatic Lithium Ion Battery 3.2v Lipo 400ah 420ah 450ah 500ah For Caravan Marine Golf Carts lar

Plastic Grade A Lithium Ion Batteries 600ah 500ah 400ah 300ah 200ah 3.2v Prismatic Lifepo4 Battery Cell For 48v Storage Pack - Buy 500ah Grade A Lifepo4 Prismatic Lithium Ion Battery 3.2v Lipo 400ah 420ah 450ah 500ah For Caravan Marine Golf Carts large Capacity Rechargeable Battery Lifepo4 48v...
m.alibaba.com
400ah? 500ah cells?
 
The posted link from Alibaba has Docan advertising some hefty 500ah cells, but havent heard of anyone purchasing them.
 
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