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Hi from Aotearoa 40-60kwh build 432P 14S MAYBE MOOOOORE
#11
Our panels from google earth, the grass seed went down the week prior to this pic so hence the section full of dirt! hmmm cant seem to upload pics?

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#12
after you put them in the "Picture section", you have to click on the images to add them where you want them in the post.
hbpowerwall likes this post
Proceed with caution. Knowledge is Power! Literally! Cool 
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#13
(11-14-2018, 01:04 AM)Sean Wrote: just buy two more leafs, a zappi, and use them on alternate days

Just looked at both of those things Smile
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#14
I am making sloooooow progress but hey progress non the less... actually what has slowed me down is my ability to commit to the task. I have been all over the place about what cell holders to use, layout, P size and solder or spot weld.

well now I am all in! thanks to AJW22 I have the PERFECT cell holder which I am 3d printing by the kilo right now (no my wife is not enjoying the noise it makes on the kitchen bench  Big Grin ) 

I will keep my aim high and plan on a 432P 14S pack using 4 of the above cell holders glued together to reach my goal (bus bar setup will not be central)
However I do want to go higher and so depending on progress will keep the idea of a 600P 14S settup in my sights.













Also I have just purchased a spot welder  Exclamation Exclamation Exclamation hope this does the job.

https://www.sunkko.net/sunkko-709ad-puls...-pack.html






I am well into my testing regime... because I am taking my sweet time to get my wall built I decided to set my opus test and charge to 3.7. I have 3d printed the large fan cooling mod and its all working a treat to crank through the batteries. 








My free supply of fabulous and near new cells is not a high volume one as I had thought  Sad 

It is only netting me about 300 cells per year. I have resorted to begging for and purchasing used laptop battery packs like so many others and the results are nasty. the cost is $800 for 100kg of batteries with a return policy for unused cells. not a bad arrangement I think. 

anyway here are my tested batteries so far...




as you can see I have a long way to go but now that I have committed to a layout it should come together more quickly. keen on your input and thoughts.



PS can a mod move this into the DIY battery project builds?
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#15
I strongly recommend you start off with a smaller battery. 14s432p would be by far the largest pack I've seen anyone build, and I'm sure it will bring with it many unforeseen challenges. Some of the issues I can think of right now:
* Each pack would weigh 20kg, the whole battery 280kg. Mechanical stability of the pack? The shelf? Is it earthquake proof?
* I had to take 1 pack (104p) out for repairs after just 4 months of operation; statistically a 432p would in theory develop issues once a month ;-p. Carefully manhandling a 20kg pack is probably no fun.
* You'd have to harvest and test 6048 cells just to get started. At my rate, I'd need 1~2 years for that many cells... by the time I finish my last cell, I'd probably have to boost charge and test the first cells again.

My recommendation is to build a more modular system that you can add batteries/packs to as they become ready. For my system, I started off with 14s92p, 2 months later added a 14s104p in parallel, going to add another 14s104p in a few weeks. The final target being perhaps 10 batteries in parallel.
I've seen someone start off with a 7s80p system, then extended/glued to that to make it into a 7s120p.
Others start with a 7s system, then later add more packs to make it a 14s.

One more tip: the card boxes the 3d printer filaments come in is perfect for storing 18650 cells. The ones I use neatly fit 125 cells! Makes counting so much easier.
Just make sure to reinforce the bottom with duct tape so that it doesn't fall out.
Scottietheyoung and DCkiwi like this post
Modular PowerShelf using 3D printed packs.  40kWh and growing.
https://secondlifestorage.com/t-AJW22-s-...PowerShelf
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#16
(06-05-2019, 03:24 PM)ajw22 Wrote: I strongly recommend you start off with a smaller battery.  14s432p would be by far the largest pack I've seen anyone build, and I'm sure it will bring with it many unforeseen challenges.  Some of the issues I can think of right now:
* Each pack would weigh 20kg, the whole battery 280kg.  Mechanical stability of the pack?  The shelf?  Is it earthquake proof?
* I had to take 1 pack (104p) out for repairs after just 4 months of operation; statistically a 432p would in theory develop issues once a month ;-p.  Carefully manhandling a 20kg pack is probably no fun.
* You'd have to harvest and test 6048 cells just to get started.  At my rate, I'd need 1~2 years for that many cells... by the time I finish my last cell, I'd probably have to boost charge and test the first cells again.

My recommendation is to build a more modular system that you can add batteries/packs to as they become ready.  For my system, I started off with 14s92p, 2 months later added a 14s104p in parallel, going to add another 14s104p in a few weeks.  The final target being perhaps 10 batteries in parallel.
I've seen someone start off with a 7s80p system, then extended/glued to that to make it into a 7s120p.
Others start with a 7s system, then later add more packs to make it a 14s.

One more tip: the card boxes the 3d printer filaments come in is perfect for storing 18650 cells.  The ones I use neatly fit 125 cells!  Makes counting so much easier.
Just make sure to reinforce the bottom with duct tape so that it doesn't fall out.

great input thanks mate. very thoughtful of the size and maintenance of the pack. I will be building it as a 108P - 14S and adding the modules as you say.
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