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SecondHandPower Cell tester build
#11
Heres a couple of shots showing underneath the cell holders.



When i get all the parts (in the next month or so)... I will be wiring up each of the (32) cell holders to work independantly with one TP4056 module and a #FCDS discharge module for each port.

I drilled for the thermistors after these shots, and [temporarily] wired up a row of 8 cells to a couple of TP4056 chargers so I can now charge 8 cells at once. 

 
The brown board below the cell holders has (6) zb2l3 modules that I am checking out. I found that two of these do not discharge to the same voltage as others, even when set the same target voltage.These will be used to drain cells to a target voltage if i can get 6 that work within 2-3 mv of each other   

The Opus is along for the ride on the brown board as well,  everything is running off of the computer power supply. 

 I have to look inside the case to see the reflection of status LEDs for the TP modules, as shown in the photo to the right. The stuff on the brown board is not part of my tester build.... just sharing one power supply temporarily.

See Fercsa's  #FCDS build page for details on how the control boards for this 32 port build will all come together.
Regards,
Gary G.

Working on a 32 port #FCDS
Testing on 8 ports now... logging to Influx/Grafana

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#12
What are you going to be used to power these on a regular basis when the pack is put together? My setup is using a 3p 10s configuration and all the cells are tested out from 1800mA to 2000mA and have installed a Diymore 3S 20A 12.6V Li-ion Lithium Battery 18650 Chargers PCB BMS Protection Board for every 30 cells. Any suggestions on what to use to keep these charged up?
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#13
(01-07-2018, 10:16 PM)larry1024 Wrote: What are you going to be used to power these on a regular basis when the pack is put together?
...
Any suggestions on what to use to keep these charged up?

Hi @larry1024,

With respect to what to use to charge your packs...
Most of the powerwall systems on this forum use solar panels and a suitable charge controller with BMS to charge and keep their packs balanced.  I have seen a couple of people on the forum using hydro to generate the charge. Wind could be an option if that is a natural resource that works for you.

I am considering solar, but I have not gotten any of that type of hardware yet.  I will be building some 18650 packs for smaller projects to use many of the lower capacity cells i am harvesting, and to learn more about charging and balancing packs.
Regards,
Gary G.

Working on a 32 port #FCDS
Testing on 8 ports now... logging to Influx/Grafana

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#14
The 32 port parts kit from Fercsa.com is in ! 

 

To get the build going in the right direction, Fercsa included one pre-assembled discharge module (DM)... I need to add a header to a TP4056 charger board so it will snap onto the DM, and the DM will snap into the Slave Module (SM).  

There will be 8 ports per slave module, and the 4 slaves will be connected by i2c bus jumpers to the Master Module (MM).

   

I have been collecting parts for the master module from various sources over the space of the last month or so... The power supply also came in today.

The only bummer is my new combo soldering station for fails to power on. The heat gun (for SMD) works OK, but I get nothing in the temp control lights when I power on the soldering iron : l

The station is a Youyue 8685...  There is a note saying "3) Plug the outlet power. Don't forget ground connection." 

 


There is an unused connector near the power cord, but no photo reference in the manual and I cannot seem to find anything resembling a ground wire part besides the traditional 3 wire power cord going to my properly grounded wall outlet. <hmmmmm>
Regards,
Gary G.

Working on a 32 port #FCDS
Testing on 8 ports now... logging to Influx/Grafana

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#15
That's for the anti-static antenna Tongue

I have no idea either. Kinda strange. Unless they re-used a case from another device that used that port and this setup doesn't.

Are we gonna be privy to a video of the assembly? And/Or review of it functioning?
Proceed with caution. Knowledge is Power! Literally! Cool 
Knowledge is Power; Absolute Knowledge is Absolutely Shocking!
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Certified 18650 Cell Reclamation Technician
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#16
(01-31-2018, 03:33 AM)Korishan Wrote: That's for the anti-static antenna  Tongue

I have no idea either. Kinda strange. Unless they re-used a case from another device that used that port and this setup doesn't.

Are we gonna be privy to a video of the assembly?  And/Or review of it functioning?

It's hard to say from the pictures. But it looks like its for a bullet style connector or a banana plug. My guess probably for an anti static wrist strap.
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#17
Confirmed... I opened it up and verified the bananna plug jack conects to ground. Also found a loose wire on the power switch so the iron will work but still not 100% since the temp readout is blank.  I will have to open it again, but lets see what the seller says. 

NOTE: To be perfectly clear, the soldering iron is from a seller on Ali Express... nothing to do with the Fercsa parts, everything is good with the parts from Fercsa, I just need to get in the groove with this new iron
neurocis and Korishan like this post
Regards,
Gary G.

Working on a 32 port #FCDS
Testing on 8 ports now... logging to Influx/Grafana

Reply
#18
Some progress on the FCDS master module. I have a FTDI USB programmer on order to load the firmware, so that will take a few days

   

 The soldering iron is working good. Its worth the investment since there's a lot of soldering in this project.
Regards,
Gary G.

Working on a 32 port #FCDS
Testing on 8 ports now... logging to Influx/Grafana

Reply
#19
I made it through the firmware download and update processes and my #FCDS master module is online!

  

I had missed one wire ( a 3v3 line for the processor) but once that was fixed, it booted up OK and presented the status you see on the tiny display.

I am working through network configuration so I can connect to it using a console window before Iconnect it to the slave module and a discharge module.
Korishan likes this post
Regards,
Gary G.

Working on a 32 port #FCDS
Testing on 8 ports now... logging to Influx/Grafana

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#20
Here is a photo showing the #FCDS master module cabled to the (4) slave modules. These components are upside down because they will be mounted underneath the cell holders.

 


The photo on the left also shows one discharge module that will be connected to a modified TP4056 module. I have 31 of these to build, but will start by verifying the first one I build works to make sure I dont duplicate any errors across the build.

The photo on the right is showing the charting capability on one of the cells Fercsa tested... the channel is available from a link on his web page.
Regards,
Gary G.

Working on a 32 port #FCDS
Testing on 8 ports now... logging to Influx/Grafana

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