Paragon PowerWall

Paragon

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May 5, 2020
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Hi, from Poland :)



For some time I am gathering with plans to build my own powerwall, i am at the stage of collecting and segregating 18650 cells:




image_heqari.jpg




image_piiaib.jpg






Plans are to build 4 sets of 14s48p each, the inverter I have ISolar SMV III 5kV (Easun), pv panels are c-sun 305W 9 pcs..


I also made in my free time baskets for storing segregated cells 18650




image_cbovge.jpg




if anyone needs files for the 3D printer, to download here in my account, where i upload new projects for download :)



- https://www.prusaprinters.org/social/46673-paragon/prints

- https://www.thingiverse.com/Paragon_34/designs



I will try to regularly update my project, I also count on comments and error if I do something wrong, off grid installations in Poland are not very popular :), that's why not much is happening in Polish forums on this topic...
 

Korishan

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Your images didn't come through. Please don't use links to post images but store them locally on the forum. That way we aren't reliant on 3rd party hosting services.
 

Paragon

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Korishan said:
Your images didn't come through. Please don't use links to post images but store them locally on the forum. That way we aren't reliant on 3rd party hosting services.

thanks I have corrected the inserted photos, I hope it's ok :)
 

Paragon

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rev0 said:
Looks good, you must have a pretty big 3d printer to fit that many cells. May I suggest offset rows for denser packing of cells? Here's my storage solution (I have a very small 3d printer, so the biggest I can fit is 36 cells): https://www.thingiverse.com/thing:3904968

Thanks, your project looks very good too, mine is a bit heavy, but I wanted to squeeze at least 100 cells :D, currently I have also made 14 baskets for 48 pcs of cell so that it would be easier for me to sort cells into the project (14s48p):


image_kmyvay.jpg



image_wwllvu.jpg


my printer is Tevo Black Widow print area 250x350 (mm)
 

Korishan

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Looking good. Plus the cleanliness and orderliness is always a plus :D
 

Redpacket

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Feb 28, 2018
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I hope you are not planning to use full 5kW from your inverter much?
This would make battery current quite high for 48p packs?
Eg 5kW at approx 3.5V/cell 14s = 5kw/49V = 102A + maybe 15% efficiency loss in inverter = 117.3A
117.3A/48 cells = ~2.44A/cell
 

Paragon

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May 5, 2020
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Korishan said:
Looking good. Plus the cleanliness and orderliness is always a plus :D

this is rack for storing tested cells, soon I will start building the first battery, based on 18650 baskets 14s60p something like this,sketched in a CAD program:



image_vlcjen.jpg



image_kvtctm.jpg





Redpacket said:
I hope you are not planning to use full 5kW from your inverter much?
This would make battery current quite high for 48p packs?
Eg 5kW at approx 3.5V/cell 14s = 5kw/49V = 102A + maybe 15% efficiency loss in inverter = 117.3A
117.3A/48 cells = ~2.44A/cell

the plans have changed a bit, I am making a slightly larger battery, so 14s60p and such batteries should be 4 modules, I plan 14s60p x 4 = 14s240p





SLaSH_007_1 said:
What size printer where the baskets made on? On't fit on a Prusa i3mk3s

my printer is Tevo Black Widow, table size 350mmx240mm, I have several designs of such baskets, if you need any specific ones, give info, I will do it for you, no problem :)

https://www.thingiverse.com/paragon_34/designs

https://www.prusaprinters.org/social/46673-paragon/prints
 

rev0

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Oct 3, 2017
Messages
370
So your final powerwall you want to use 4-cell holders, and individually fuse with replaceable fuses? Sure is the most flexible design but boy that looks like a heck of a lot of work, and not very space efficient.
 

Paragon

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May 5, 2020
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rev0 said:
So your final powerwall you want to use 4-cell holders, and individually fuse with replaceable fuses? Sure is the most flexible design but boy that looks like a heck of a lot of work, and not very space efficient.


exactly as you write, I have a lot of space for this project, a separate room, and a 5m long wall at my disposal and I want to use it :)

you're right a lot of work, but later very easy access to cells and fuses, additionally it is easy to locate damaged cellsand quick replacement an additional plus is a very good cooling for cells that are not squeezed into tight packages
 

ajw22

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Have you looked at the actual parts you plan to use? I suspect it's going to be really difficult to solder it all together like in the CAD. And if you add gaps for working space, you might need a ladder to access the top rows.
 

Paragon

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ajw22 said:
Have you looked at the actual parts you plan to use? I suspect it's going to be really difficult to solder it all together like in the CAD. And if you add gaps for working space, you might need a ladder to access the top rows.

Yes, I thought it all over, at least I think so :), i will have access to any place without a ladder, everything will be assembled on an OSB board, only later the whole thing will be hung on the wall as one of four such modules

maybe this weekend I will start to put together something, I will show photos of how I'm doing
 

Paragon

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May 5, 2020
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ajw22 said:
This might be an interesting variation to your design (scroll down a bit) to reduce both cost and space. Perhaps with 2x or 3x18650 cartridges.
https://secondlifestorage.com/showthread.php?tid=6578

Great idea thanks for the link, I would prefer, however, that the cells were single, but it is a good idea you can quickly increase the battery capacity, and no need to expand with new handles,

and that's what bothers me one thing, what diameter of these wires between the cells (handles) in my project will be ok, a 15s60p battery, enough copper wire 2.5mm, or two such wires twisted together?


image_styolm.jpg
 
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