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AJW22's modular 3d printed 30kWh PowerShelf
#31
(06-10-2019, 09:46 AM)ajw22 Wrote:
(06-10-2019, 08:51 AM)simonisabella Wrote: is there a scad file for your latest 8 pack,  as i need to modify the amount in parallel to suit my ender 3 bed size -230 x 230

I attached "BatteryPack8.stl.zip" to the post on page#2 with all the other files.  You can change the pack size by changing "cells_x=14; cells_y=8;" towards the bottom of the file.

how do you get open scad to read a stl file,    as once i open a batterypack 8 stl,  it goes directly to cura,       if i open open scad it will not read the stl file ,  it needs to be in open cad format.        your original post on the 1st page has a scad file attached,  but that is different to the design you are using now,   do you have a open scad file for the design you are using now,
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#32
(06-10-2019, 10:49 AM)simonisabella Wrote:
(06-10-2019, 09:46 AM)ajw22 Wrote:
(06-10-2019, 08:51 AM)simonisabella Wrote: is there a scad file for your latest 8 pack,  as i need to modify the amount in parallel to suit my ender 3 bed size -230 x 230

I attached "BatteryPack8.stl.zip" to the post on page#2 with all the other files.  You can change the pack size by changing "cells_x=14; cells_y=8;" towards the bottom of the file.

how do you get open scad to read a stl file,    as once i open a batterypack 8 stl,  it goes directly to cura,       if i open open scad it will not read the stl file ,  it needs to be in open cad format.        your original post on the 1st page has a scad file attached,  but that is different to the design you are using now,   do you have a open scad file for the design you are using now,

Stupid me uploaded the same .stil again when I meant to upload the .scad.  Fixed!
simonisabella likes this post
Modular PowerShelf using 3D printed packs.  30kWh and growing.
https://secondlifestorage.com/t-AJW22-s-...PowerShelf
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#33
If anyone is still planning to use my pack design:
I've attached the latest source .SCAD file to my first post as "BatteryPack9.zip".
Latest improvement adds 8 small stoppers to prevent my white brackets from moving along the pack when I slide the packs on my shelf during maintenance.

new design with stoppers


previous design
Modular PowerShelf using 3D printed packs.  30kWh and growing.
https://secondlifestorage.com/t-AJW22-s-...PowerShelf
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#34
(02-27-2019, 01:23 PM)ajw22 Wrote: A few words on Raspberry Pi 3 + Grafana monitoring, and its uses.

I thought about using rePackr to assemble the packs for my first 14s92p battery.  Turns out I'm too lazy to catalogue 1288 cells, much less sort/fetch the exact ones rePackr says I need.  So instead I went the sort-into-100mAh-buckets route.
For the second battery (14s108p) I couldn't be bothered to do even that.  The third battery (another 14s108p) was assembled using totally random cells, though I capacity & leak tested all of them.

After 6 months of operation, I finally got around to installing a remote monitoring system using Raspberry Pi 3 + Grafana.  The first time I drained to 3.2~3.35V, it was immediately noticeable that the packs had mismatched capacities.  One pack had broken fuses (bad soldering), some had cells with electrolyte leaks, others were low/high capacity purely due to bad luck.

(ignore the noises/blips.  Just software glitches I've now mostly sorted out)


After fixing the problems as well as shuffling some low/high capacity cells to balance out the capacities:


So not only does this system help me identify and fix issues, it also allows me to build my packs in the most lazy way and sort out any capacity balance issues later :-)

Maybe a stupid question, but what is the source of your data that you gather.  Is it supplied by your solar chargers? Or do you have additional hardware (BMS) you use for this?
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#35
Absolutely not a stupid question.
The chinese "Smart BMS" comes with a bluetooth dongle.  The (extremely poorly written) specifications are listed on their website https://www.lithiumbatterypcb.com/ , and there are several projects on the internet if you search for "smart bms bluetooth programming".  I couldn't get any of them to run properly, so I wrote my own python script to connect to and query 3 BMSs and once a minute upload the data to a local (RaspPi3 that is) Postgres DB server.  Really still a work in progress, but at least it has stopped crashing all the time.

I'll add this to my previous post.
bvh likes this post
Modular PowerShelf using 3D printed packs.  30kWh and growing.
https://secondlifestorage.com/t-AJW22-s-...PowerShelf
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