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Richie`s Modular Powerwall (Germany) 21kWh+
#11
Did you test the glass fuses? I got some from Ebay wich burn before and behind the glass. The hot glass falls down. Very bad. Burn some to see how they work. I decided to use fuse wire now. Did you sell a bigger amount of LG MG Cells on Ebay?
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#12
(10-06-2019, 06:33 PM)richie241 Wrote:  

All Packholders are ready and were produced by 3D printer.

I'm using the same 3D printed pack holders for my powerwall, that look and work great.

Following on from the advice of ajw22 I'll be adding some small metal L brackets in the bottom recess just for security.
richie241 likes this post
UK Southwest.

7 kWp Solar Panels (28 x 250Wp Shinetime Mono).
14 X APS YC500i Micro Inverters.
28 X 40P 18650 cell packs/modules configured as 14S 80P.
Sofar Mass Energy ME3000SP AC coupled charger/inverter.
Still sourcing and processing cells for powerwall.
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#13
Quote:Did you test the glass fuses? I got some from Ebay wich burn before and behind the glass. The hot glass falls down. Very bad. Burn some to see how they work. I decided to use fuse wire now. Did you sell a bigger amount of LG MG Cells on Ebay?


My fuses come from AliExpress, the same Glass Fuses witch are often tested here in the forum + YouTube.
I made a test pack with the fuses and Spotweldung, everything works well.
I have atm no cells to sell, i bought all the new cells.


Quote:I'm using the same 3D printed pack holders for my powerwall, that look and work great.

Following on from the advice of ajw22 I'll be adding some small metal L brackets in the bottom recess just for security.


Very very good point! Thanks.
I've also been thinking about reinforcing the lower brackets for safety reasons.  Idea
2013: 40x PhonoSolar 250Wp @SMA Tripower 10000 || 2016: LG Chem RESU 12kW @SMA SunnyIsland 4.4 || 2019/20: DIY POWER :-)
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#14
Hi all,

finally I had time to work on the first pack. (Just positiv side)
Before that, I thought and tested how best to implement the setup. I think this way will work fine.


I have to say that the spot welding works better than the normal soldering on the busbar. ;-)

The busbar consists of 3x 4mm2 wire, XT90 connector and 8 AWG silicone cable.  at the lower connection the pack should be extended later (Modular Powerwall)
The max. charge current will be 50A (max Inverter current)



2013: 40x PhonoSolar 250Wp @SMA Tripower 10000 || 2016: LG Chem RESU 12kW @SMA SunnyIsland 4.4 || 2019/20: DIY POWER :-)
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#15
(10-06-2019, 06:33 PM)richie241 Wrote:  



All Packholders are ready and were produced by 3D printer.



Thats it for now - new Updates next week :-)

Congratulations love your project. I'm building a 7s40p pack and thinking of 3d print brackets like these to mount the packs. i don't own 3d printer or have any experience in 3d. are your brackets 3d files available on internet?


Regards
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#16
(11-05-2019, 06:19 PM)3xtr3m3 Wrote:
(10-06-2019, 06:33 PM)richie241 Wrote:  



All Packholders are ready and were produced by 3D printer.



Thats it for now - new Updates next week :-)

Congratulations love your project. I'm building a 7s40p pack and thinking of 3d print brackets like these to mount the packs. i don't own 3d printer or have any experience in 3d.  are your brackets 3d files available on internet?


Regards

You find the Cellholders here (4 & 6 cell version):

https://www.thingiverse.com/thing:2572115


originally it was planned to extend the packs further in series, therefore also the lower XT90 connectors.
It would be better to connect 1 or 2 more packs with 60 cells in parallel with 14 or 28 more LongMons, wouldn't it?
In the end I would have 3x 14S60P with a total of 36 LongMons, - the LongMons would have to be relieved as well, right?

What do you guys think?
2013: 40x PhonoSolar 250Wp @SMA Tripower 10000 || 2016: LG Chem RESU 12kW @SMA SunnyIsland 4.4 || 2019/20: DIY POWER :-)
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#17
(11-07-2019, 11:22 AM)richie241 Wrote: ...

originally it was planned to extend the packs further in series, therefore also the lower XT90 connectors.
It would be better to connect 1 or 2 more packs with 60 cells in parallel with 14 or 28 more LongMons, wouldn't it?
In the end I would have 3x 14S60P with a total of 36 LongMons, - the LongMons would have to be relieved as well, right?

What do you guys think?


Hi Richard,

that's exaclty my kind of solution. At the Moment I am building a second Battery Bank of 14S60P with it's own Longmons.
Then later when I have more Cells I plan to alternately upgrade each Bank from 60P to 80P or maybe 100P.
That way if there is a problem with one pack I can sutdown this Bank and still have another running.

cadric
1. Grid-Tie System 09.2017 16,5kWp:  55 x 300Wp BenQ, SMA Tripower 15000-TL30 (18-east/17-south/20-south)
2. Offgrid System 09.2019 7,5 kWp: 25 x 300Wp Solarworld (5x( 3S + 2S )), 2x PIP-5048MS, Batrium WM4, 1st Battery Bank: 840 cells in 14S60P with 80Ah cap.
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#18
(10-27-2019, 04:24 PM)richie241 Wrote: The busbar consists of 3x 4mm2 wire, XT90 connector and 8 AWG silicone cable.  at the lower connection the pack should be extended later (Modular Powerwall)

Maybe I'm a little late with this... so... sorry about that. Nevertheless...

I aswell thought about adding cells to a pack via a second connector but came to another solution:
I will make a connector bar where every pack gets plugged in. The bar has 14 connectors in series (to get 14s configuration) and has multiple connectors at each place in parallel. Like so, the busbar of the pack does not have to transfer additional current through it as the powerwall grows (I do it like so to keep a certain flexibility - I then can (when enough cells are connected) draw higher currents and each pack «shares» the duty in stead of having to handle the additional load.
If you only want to grow capacity-wise it shouldn't matter too much (since the currents are only gonna spread out over more cells and the busbar shouldn't see more amps in total). But if your systems peak power goes up, you have to be sure, the daisy-chained packs have sufficient bus bar gage to come by the additional current delivered by the added cells.
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