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the "this sounds like a fun project" powerwall (in Belgium)
#11
Already an idea on the fire suppressing material you plan on using?
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#12
To be honest... No Sad
I've been between soldering like a madman, some other hobbies, work but most importantly some illness in the family for the last few weeks.

I completed pack 1 - 14 like 2 weeks ago, but haven't found the free time to start setting it all up yet.
I have some last parts coming in on Tuesday for the changes to my electrical distribution board.
Solar panels are also on the way, will be another 2 weeks or so...

I'm leaning towards constructing my own shelves, while keeping an eye out for a suitable cabinet.
There is still some discussion ongoing with my wife about the location of the batteries themselves, being either inside in the attic or outside on our terrace (in some weatherproof housing).

I'll certainly order some extra smoke/fire detectors to go inside the battery room/cabinet.
Do you have some recommendations, @bvh?
Batteries harvested: 2500+ / Cells tested: 2266 (Average: 2357 mAh)
Usable 1800+ mAh batteries: 1943 (78 %) / Cells in production: 14S 60P -> soon 1680 =14S 2x60P

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#13
So, it's been a while since I had anything to share...

But the powerwall is finally up!  Cool 
For safety reasons, the batteries were moved out of the house, so I got myself a shed... Turns out it's Australian  Big Grin 
I added some XPS insulation to keep the temperatures within reasonable levels.
 
I mounted the PIP5048-GK to a board, together with the ABB breaker, the batrium system and the distribution box.
It's ugly and I'll probably redo it but it works for now. 
14S 60P for now, 136 Ah per pack. I have another set of 60P packs that still need soldering.
 

And a view of the makeshift shelves with the monitoring computer on top.

Still needed:
- Moar batteries! So, soldering the next 14 packs.
- Adding a spare pack.  Right now the powerwall is down because of some blown fuses on pack #3.
- Providing some more space to work inside the shed. 
- Tidying up the cables and adding a network connection.  The PIP5048GK has bluetooth connection, but the range is abysmal because it's in a metal shed.
- Adding more house load when the extra packs are in place. I'm limited to +/- 30A  on the powerwall right now because of the 60P with 0,5 A fuses.
- Replacing some filament LED bulbs inside the house. The flickering from the PIP inverter is quite bad, makes you nauseous. LED bulbs with power electronics don't have this problem.

Any thoughts, remarks?
Batteries harvested: 2500+ / Cells tested: 2266 (Average: 2357 mAh)
Usable 1800+ mAh batteries: 1943 (78 %) / Cells in production: 14S 60P -> soon 1680 =14S 2x60P

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#14
Nice shed ... gonne be too small soon  Wink

Any idea why the fuses blown?
___________________________________
18x 300Wp solar off grid and 10x 180Wp solar tracker grid-tie
10KW 3phase hybrid inverter. 40Kwh 18650 storage (for now)
My setup: https://secondlifestorage.com/t-Instant-powerwall
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#15
I was making the connections between the packs with nuts and bolts and I used a ratchet wrench with an extension.
I touched the next bolt, creating a short over the pack # 3 and 4.  On pack 4 I had 58 out of 60 fuses blown, on pack 3 I had 19 blown.

Regarding the size of the shed: if I manage to get cells in a similar range for the next packs, then I'd be able to fit  42 kWh on this shelf and I have room to add a second one just like it.

I'll get the powerwall back up this weekend and I've started soldering packs 15 - 28.  Tongue
Batteries harvested: 2500+ / Cells tested: 2266 (Average: 2357 mAh)
Usable 1800+ mAh batteries: 1943 (78 %) / Cells in production: 14S 60P -> soon 1680 =14S 2x60P

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#16
Hi Wimpie007 Smile

In a previous post You wrote: "After using repackr, I had the values to go in each pack but some late nights later it seems I've made quite a few errors along the way."

Here is an idea You are free to use:

Collect all the cells for one complete cell bank (f.eks. 60 x 14 cells in Your case)

Now sort all the cells in capacity, hi to low.

Next ready the cell holders, all 14 of them:

Use the cells from the high capacity end.

Populate cell 1 in each cell bank from left to right with the first 14 cells, next populate cell 2 from right to left, cell 3 from left to right,  and so on, until all 840 cells are placed.

(When You have placed the first 14 cells #14 may be a few mAh lower in capacity, however by reversing the direction of mounting #28 will be placed next to #1, #27 next to #2,  cancelling the differences in capacity.)  

Now You have 14 cell banks with equal capacity, give or take 1%.

Only disadvantage: It is hard not to start making the cell banks until You have collected 840 cells Smile

Best of luck with Your build.

ChrisD
Korishan likes this post
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#17
This it how Daromer/DIY Tech & Repairs has built several of his packs, and even has videos showing the progress. And his packs/strings have been running for several years now
Proceed with caution. Knowledge is Power! Literally! Cool 
Knowledge is Power; Absolute Knowledge is Absolutely Shocking!
Certified 18650 Cell Reclamation Technician

Please come join in general chit-chat and randomness at Discord Chat (channels: general, 3d-printing, linux&coding, 18650, humor, ...)
(this chat is not directly affiliated with SecondLifeStorage; VALID email req'd)
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#18
I probably lost some time when messing around in Excel to get the measurement data in, but it seemed like a logical way to keep track of what I had.

If I didn't have all the data, I would have settled on 80P packs or even 100P packs, before I realized I had enough good cells to go for 2 x 60P.
Having found some cells I felt unsure about after building the packs, I've replaced some with similar capacity ones that I had left over.
So if I start building packs again, I'll first have to do an inventory of what I still have...

The choices we make early on, can carry through for quite a while Wink

Quick question, how do you guys monitor the PIP inverter?
Through USB permanently connected?
Batteries harvested: 2500+ / Cells tested: 2266 (Average: 2357 mAh)
Usable 1800+ mAh batteries: 1943 (78 %) / Cells in production: 14S 60P -> soon 1680 =14S 2x60P

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#19
(08-03-2019, 04:29 PM)ChrisD5710 Wrote: Hi Wimpie007 Smile

In a previous post You wrote: "After using repackr, I had the values to go in each pack but some late nights later it seems I've made quite a few errors along the way."

Here is an idea You are free to use:

Collect all the cells for one complete cell bank (f.eks. 60 x 14 cells in Your case)

Now sort all the cells in capacity, hi to low.

Next ready the cell holders, all 14 of them:

Use the cells from the high capacity end.

Populate cell 1 in each cell bank from left to right with the first 14 cells, next populate cell 2 from right to left, cell 3 from left to right,  and so on, until all 840 cells are placed.

(When You have placed the first 14 cells #14 may be a few mAh lower in capacity, however by reversing the direction of mounting #28 will be placed next to #1, #27 next to #2,  cancelling the differences in capacity.)  

Now You have 14 cell banks with equal capacity, give or take 1%.

Chris, this is exactly how I did it.....worked fine for me.
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#20
@Franky: Please move your replies outside of the quote block. I have no idea where Chris' comments are and where yours are. You can make multiple quote blocks if commenting on different parts.
Proceed with caution. Knowledge is Power! Literally! Cool 
Knowledge is Power; Absolute Knowledge is Absolutely Shocking!
Certified 18650 Cell Reclamation Technician

Please come join in general chit-chat and randomness at Discord Chat (channels: general, 3d-printing, linux&coding, 18650, humor, ...)
(this chat is not directly affiliated with SecondLifeStorage; VALID email req'd)
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