Beginners Guide to Processing 18650 Cells | Cell Database


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Batteriapans setup
#1
Thought it could be nice to document my progress on the forum.

Starting of with my 7s20p with a maximum capacity of about 1kWh. 
 
Best cells (~2500mAh) in the top left pack, crappy cells (~1500mAh) in the bottom right pack.

Waiting for a couple of meters with shrink tube from China to isolate the wires before I can move on to the next step.

600W 24v pure sine inverter from Mercury.  "Soft start" is supposed to mean 1200W for up to 2 seconds. Payed just below EUR 100 for it with shipping to Sweden.



I have no clue how good or bad this is, but from what I could read it seems quite nice.

2A type B circuit breaker to put on the inverter output. That means 480W, even though the inverter handle short bursts up to 1200W. But I don't want to put any strain on the cells while I only have 7s20p.

 

The inverter has blade fuses, but I of course prefer to use a circuit breaker...

I was actually considering a 2A type C or D circuit breaker to allow short bursts up to 600W, but wasn't able to find any detailed specifications for circuit breakers that told me exactly for how long it would allow the bursts. So rather safe than sorry.

40A circuit breaker I'll be putting between the battery and the inverter. Still waiting for it from Taiwan though...

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#2
Just a suggestion. When building your packs try to mix the cells through all your packs so every pack has an even capacity. You will find that your lowest capacity pack will crash first dragging everything else down.
Korishan likes this post
Follow my journey as a Fire Fighter builds his own DIY Powerwall.

https://www.youtube.com/channel/UCOV6v9i...IZ_49k-WpA
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#3
(03-21-2017, 11:29 PM)FiremanDIYPowerwall Wrote: Just a suggestion. When building your packs try to mix the cells through all your packs so every pack has an even capacity. You will find that your lowest capacity pack will crash first dragging everything else down.

Hi, thanks for the suggestion. 

I'm still in the harvesting cells phase of the project. Plan to first double (7s40p) and then tripple (7s60p) the amount of cells. I hope to end up with packs where the cells are around 2300-2500mAh and with a low internal resistance. The old crappy packs will be stoved away, but until I have all good packs the crappy will be used in parallell to get the same capacity as the good packs. 

It's going to take a bit of time, perhaps a year, before I get there.
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#4
As long as 1 string have even cells in every parallel pack it should be fine. Thats how im running my setup. Btw That 40A circuit breaker you have... Im pretty sure thats junk Smile I have bought several of those from ebay and they did not trigger as they should nor did they work long term.

Just a tips Smile

"Batteriapan" Svensk? Smile
Follow me! >> 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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#5
(03-22-2017, 08:27 AM)daromer Wrote: As long as 1 string have even cells in every parallel pack it should be fine. Thats how im running my setup. Btw That 40A circuit breaker you have... Im pretty sure thats junk Smile  I have bought several of those from ebay and they did not trigger as they should nor did they work long term.

Just a tips Smile

"Batteriapan" Svensk? Smile

Any suggestions to what I could replace the crappy circuit breaker with? What I liked with the one I ordered is the format. It's a bit of a hassle to install a standard breaker without a standard rack, and I don't want to go mixing the AC with DC in the same rack.

Bor i Sydvästra Skåne med stuga i Norra Skånes lövskogar. 
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#6
Northen skåne? Not far from me then. Alvesta (Växjö) here Smile

The DC breaker part is a hassle i agree. I was looking at those too but so many reports out there that they didnt work properly. I actualy dont have any main fuse right now but smaller fuses on each string.

Main breaker i have is either:
http://www.biltema.se/sv/Bil---MC/Bil-ti...000020071/
or
http://www.biltema.se/sv/Bat/El/Strombry...000022613/

For switching between i like this one:
http://www.ebay.com/itm/Blue-Sea-6007-Du...Mr&vxp=mtr

Biltema have too but i do not like it because you cannot switch from 0 to 1 or 2..

Regarding fuses i have ANL fuses here but have not added them yet. ANL can be found on biltema too and they would do the job pretty good Smile
Follow me! >> 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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