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SolarPowerWall (Germany)
#1
hi,
long time passive reader, now its time to say hello...
working with electronics and computers since 1982, build my first offgrid solar 1986.

some pictures of my project, 1/2 finished:
400w 72cell solar
epever xtra4415
smartbms 6s + esp8266 webserver/mqtt for smarthome integration
480cells (same type, same source, 95%)

cheers
iDIYot



safety first, packs are spotwelded, single fused, fr4 covered, 1.5mm steel housing

bms dinrail holder & cell cleaner/grinder
https://www.thingiverse.com/idiyot/designs

cheers
iDIYot
Korishan, ajw22, OffGridInTheCity like this post
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#2
Very nice looking, but be aware that this design is not suitable for high current usage... perhaps sustained max of 10A~20A(*1) 20A~30A.  All the current has to pass through the areas marked in red, which at the narrowest point probably has only about 3.15mm^2 cross section (guessing 7mm wide x 0.15mm thick x 3 bridges).  A copper wire soldered along the orange line would help a lot.

(*1) Just looked up the electrical resistivity of nickel (4x that of copper) and steel (8x ~ 40x that of copper).  
https://en.wikipedia.org/wiki/Electrical..._materials

Modular PowerShelf using 3D printed packs.  60kWh and growing.
https://secondlifestorage.com/showthread.php?tid=6458
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#3
2 busbars per area 6mm² each are prepared for soldering, test current was less than 10a...

thanks
iDIYot
ajw22 likes this post
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#4
Most interesting way of connecting the cells.
Hope that type of connection provides sufficient current.
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#5
6s folded (u-form)
load 80-120w (home server & cctv+ir)
current should not be an issue...

iDIYot
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