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Zag's Powerwall adventure (UK Build)
#1
It begins...

Only got 4 solar panels and a 600w micro inverter at the moment but the battery storage is the next stage.



Does anyone have any tips for mounting the powerwalls to the wood? Should I build some shelves in or buy a metal electrical box instead?

Powerwall Kit List
Batteries: https://www.fogstar-wholesale.co.uk/prod...msung-30q/
BMS: https://www.aliexpress.com/item/32811228...28650.html
Series Connectors: https://amzn.to/2KIINKQ
Bus bar to series wire Connectors: https://www.ebay.co.uk/itm/311744812285
Mini Voltmeter: https://amzn.to/2KHipBa
14AG-16AG Butt connectors: https://amzn.to/2MONlwv

eBike Kit List
Battery Bag: https://amzn.to/2MOQIUy
48v Battery percentage meter: https://www.amazon.co.uk/gp/product/B01LVY1ODN
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#2
We all do it differently. Some mount to the wall some do shelves. I prefer shelves since it takes less wall space but then its not a powerwall anymore but more of powershelf Big Grin
owitte, WuggyBuggy, zag2me And 1 others like this post
The Ultimate DIY Solar and build place
YouTube / Forum system setup / My webpage  Diy Tech & Repairs

Current: 10kW Mpp Hybrid | 4kW PIP4048 | 2x PCM60x | 83kWh LiFePo4 | 10kWh 14s 18650 |  66*260W Poly
Upcoming: 14S 18650~30kWh | Automatic trip breakers, and alot more
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#3
I mounted them directly to the wall, maybe you can get some inspiration from here: http://secondlifestorage.com/t-There-s-a...in-Germany.

Have sun!
Oliver

Cells tested: 4994 (overall: 9662 Ah, average: 1935 mAh)
Cells in production: 2940 (overall: 6174 Ah, average: 2100 mAh)
Wall bank: 7s320p, 672 Ah, 16 kWh
Box bank: 7s100p, 210 Ah, 5 kWh
Project page
Live solar/powerwall values
Daily graph
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#4
Today I bought:

- Home Electrical wire (for the bus bars)
- Resistors (for the fuses)
- Cell holders
- 400 new Samsung 30Q 18650 cells

Hopefully that should get me started.

Another question... what width should the bus bar cable be?
The electrical wires that came out of the house wiring are 3mm total (7 strand) and 5mm total(7 strand) at the moment.
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#5
The busbar size depends on the current you want to carry. In general 1.5mm2 = 10A and 2.5mm2= 16A current in Sweden as typical household.

i use 6*2.5mm2 for my 80p packs with max 80A current. That gets me to e decent low voltage drop.
The Ultimate DIY Solar and build place
YouTube / Forum system setup / My webpage  Diy Tech & Repairs

Current: 10kW Mpp Hybrid | 4kW PIP4048 | 2x PCM60x | 83kWh LiFePo4 | 10kWh 14s 18650 |  66*260W Poly
Upcoming: 14S 18650~30kWh | Automatic trip breakers, and alot more
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#6
That depends on you load. The cells are rated for 15A continuous. 400 cells...7S57P? That would be 855A continuous, if wou want to use that you need quite substantial busbars Smile
However, if you are only running your inverter at its max 600W then it would not be more than ~30A or about 500mA per cell. At 24V that is.
For that you should go for 4mm². Go for 6mm² if you want to be on the very safe side of things. You said you have 3mm and 5mm, are you sure this is the diameter and you haven't missed the ²? 3mm diameter is already more than 6mm², 5mm is over 20mm².
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#7
New Samsung 30Q x 400 Smile

Would you recommend I test and balance them, or just throw them into equal power packs?

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#8
You have a lot of space to mount batteries there Smile
BRAND NEW: LiFePO4 26650 Cells! Starting at $2.50 each!!
^ Use coupon code "powerwalls" on checkout for a 10% discount
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#9
Well, even brand new cells have some slight variations. There is a minimum capacity and a rated capacity and sometimes a typical capacity as well. If you want to test them, sure, go ahead. However I would probably avoid the effort. Just check if their voltage is equal. They are charged at the factory to a certain standard, often accurate to a hundreth of a volt. Maybe their shipping voltage is even specified in the datasheet.

If they are equal then you are ready to go!
zag2me and Korishan like this post
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#10
Personally I'd test a sampling from each box. Say 10 from random locations. But definitely check the voltage and test any that are outside of the median voltage
Korishan and zag2me like this post
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