Beginners Guide to Processing 18650 Cells | Cell Database


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Lux's Powerwall
#1
Intro

With this topic i want to start my own powerwall/Solar shed.

Idea

These idea's can change any moment the more experince i get.
In my back yard stands a 2 by 2 meters shed the idea is that my projects will be all powerd by solar panels.
Until i get more solar panels i will have to do with one 40w panel (estimate).
The solar panel will charge my powerwall made from recyceld 18650 cells.
The powerwall will be feeding a couple of devices:

  1. A Raspberry pi B+ running boinc and a webserver for stats 3 watts.
  2. 2 Antminers 1,6ghash , 2 asic blockerupters 366 mhash total power 10 watt.
  3. Controll board 5 watt (estimate).
  4. Small water pump 5 watt.

Projects

All the individual projects that combine in one solar shed.


  1. Powerwall
  2. Controll panel
  3. Raspberry pi data logger
  4. Solar Bitcoins
    more projects will be added in the future

Powerwall

The powerwall will be build from 18650's.
The system will run on 24v so the pack will be 6s how many in parallel will be depending on the total amount of cells i can get.

Controll panel

I will be making a controll panel where everything comes together.
On the controll panel there will be a couple of volt and amp meters.
There will be a costum pcb with a solar controller.

Raspberry pi
The Arduino will measure everyrthing and sends his data to the rapsberry pi that host a web page where you can see al the data.
On the pi runs a boinc client to uses up all the unused clock cycles.

Solar Bitcoins
I have a couple usb bitcoin miners laying around that will be connected to the pi that runs the bitcoin client.
Yes i know i am not getting any reasonable amount of money but it is just for fun.
In a year i make 0,95 dollar cent or so.

End

Everytime there is someting new i will post a update.

bye for now: Lux
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#2
While your devices add up to only around 23 watts you have to remember that you might not always be getting a full 40watts of output from your panel and also you need to keep the system running through the night when there will be no solar so you need to be able to power the system and also store enough energy through the night. At a guess your not going to have enough power to be able to do that with the planned setup and would need more solar to make it operate 24/7.

I would also look to go 7s on the pack which fits in a little better with a 24 system.

Col
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#3
For this many loads, i highly doubt a 40Wp panel is enough. I bet you need at least twice as much. 100Wp panels are reasonabl priced. Much less cash per Watts than a 40Wp one-
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#4
Chickey Wrote:While your devices add up to only around 23 watts you have to remember that you might not always be getting a full 40watts of output from your panel and also you need to keep the system running through the night when there will be no solar so you need to be able to power the system and also store enough energy through the night. At a guess your not going to have enough power to be able to do that with the planned setup and would need more solar to make it operate 24/7.

I would also look to go 7s on the pack which fits in a little better with a 24 system.

Col

Hi Col

Thanks for your respons.
Your a totally right about that i will not have enough solar power for 24/7.
The 40 watt is a estimate i have not tested in the real world.
Again your a right with the 7s pack i made a miss calculation.

Shoopinguin Wrote:For this many loads, i highly doubt a 40Wp panel is enough. I bet you need at least twice as much. 100Wp panels are reasonabl priced. Much less cash per Watts than a 40Wp one-

Thanks for your respons.
Same as above it is a estimate i will be looking in a second solar panel.
The panel i have now was a gift.


Again Thanks for the comments.
Look forward for a update.

Bye for now Lux.
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#5
Update 01

Intro
My first batch of cells arived.
Next time i will take pictures with a good camera.

Photo's
[Image: WY2fbvX.jpg]

Opening the packs with a hammer and a screwdriver some people maybe scared of this, But if you do it correctly you dont damage the cells.
[Image: ktXt13V.jpg]

Sorting the cells by color
[Image: QFxFB0s.jpg]

Charging
For now i am charging the cells with 2 tp4056's,
It is slow but there are more chargers on there way.

List of what i will be ordering for the charging proces:
8x tp4056
2x 18650 x4 holder

Cell processing
the past week i have been strugeling about how i will be testing the cells.
What is the right order to test the cells:

Measure voltage cell -> charge the good cells -> discharge the cells -> write the mah data on the cells -> charge the cells.
or
Measure voltage cell -> charge the good cells -> write the voltage on the cells -> store the for a week-> Measure the voltage for selfdischarging-> discharge the good cells-> Write the mah on the cells-> charge the cells

What is the rigt way? Does some one else have a better way?

Dischargers
I want to discharge the cells with a diy discharger.
https://www.youtube.com/watch?v=WScPyfQz_f8
Reason why i dont want to discharge with a imax b6 of some sort is that you only can discharge one cell at the time and they are more expensive.
I want to build 4 dischargers, Best would be if there be one arduino with 1 display with a couple buttons to scroll trough the values.
With 4 resitors and 4 cell holders.
only problem is that i can not edit or program the code maybe there is someone on this forum who find this a interesting project, i think a lot of people find it helpfull.
Now i have to buy 4 arduino's 4 lcd's the arduino and the lcd are the most expensive.

Bye for now and good luck with your own powerwalls.

Lux
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#6
Loking forward to see all of this grow.
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#7
Nismo nick Wrote:Loking forward to see all of this grow.

Thnx for you reply.
The next update will be about extracting busbar form transformers.

Lux
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#8
Hi Lux,

I'm using an Opus BT- C3100 V2.2 Digital Intelligent 4 Slots LCD 10400 14500 Battery Charger, bought brand new off eBay for AU$50. Works great, just put your cells in the charger, select the mode and walk away.

John
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#9
Tesla101 Wrote:Hi Lux,

I'm using an Opus BT- C3100 V2.2 Digital Intelligent 4 Slots LCD 10400 14500 Battery Charger, bought brand new off eBay for AU$50. Works great, just put your cells in the charger, select the mode and walk away.

John

thanks for you reply,

i have read al lot about the bt-c3100 charger/discharger but it is to expensive for me at this moment.
Maybe i find one second hand.

Lux,
CrankyCoder likes this post
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#10
If you already have some 12v power supplies which have a 2.1mm barrel connector then you may want to consider the liitokala 4 cell charger/discharger which is very cheap, will be slightly lower tomorrow.

http://s.click.aliexpress.com/e/URjI6QJ
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