Beginners Guide to Processing 18650 Cells | Cell Database


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Portable Mini 12V/300W "Powerwall" Project
#1
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Howdy DIY Powerwall-ers! I am taking inspiration of building a DIY powerwall and scaling it down into a more beginner friendly project that is affordable and has a useful purpose. The goal of this project is to DIY a 12V power system which will run an 300W inverter which is intended to be used for light loads over many hours, or can take a modest load for a shorter period of time. I am starting a YouTube channel and build series for this project, so be sure to check back for updates as it all comes together.



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#2
I am actually thinking along the same lines. probably 1000w tho. I rent so whatever I build needs to be portable.
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#3
(07-02-2017, 01:19 AM)Droid126 Wrote: I am actually thinking along the same lines. probably 1000w tho. I rent so whatever I build needs to be portable.

This is the mini project as a stepping stone to learn from before I tackle a 2000W system that runs off of a 24V battery pack and will have almost three kilowatt hours of power. The 2000W system will still be portable, but of course not nearly as compact as this 300W system I am building.
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#4
I've got roughly 600 cells that are 2000+ mah, I'm going to build 3 packs of 200, probably will use a plastic Stanley, rolling 50 gallon tool box to house it. I may or may not get some sort of solar charge controller. I'd like to be able to maybe run my fridge for a day or 2 if the power goes out.
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#5
Here is episode two, which tears into a (new) laptop battery to harvest its nine cells and start the process of capacity testing them:



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#6
12 volt is a great place to start!
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#7
Here is episode three, which breaks down the 36V eBay batteries and capacity tests them:



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#8
Here is episode four which looks at how well the used Dell laptop batteries tested, how well some Ultrafire Red batteries tested, how well some Ultrafire Yellow batteries tested, how well the eBay 36V pack batteries tested, and how well the no-name Chinese laptop pack batteries tested.



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#9
(07-02-2017, 04:05 PM)Droid126 Wrote: I've got roughly 600 cells that are 2000+ mah, I'm going to build 3 packs of 200, probably will use a plastic Stanley, rolling 50 gallon tool box to house it. I may or may not get some sort of solar charge controller. I'd like to be able to maybe run my fridge for a day or 2 if the power goes out.

I would go with 4S vs 3S for 12V, 14.8V for 4S and 11.1V for 3S nominal, 4S will result in lower current draw. Efficiencies across the board should be better. It would also allow for a pack to fail and the system to continue to function with 3S for a limited time.
Korishan likes this post
 CyberWall #1 DC2DC 7S80P 2300mAh avg Cell #2 DC2AC 7S80P 2200mAh avg Cell LG MF1
Chargers: 1xEV-Peak CQ3 400W 4 Chan(with DIY 6S cradle allowing 4x6S1-3P) 7x Foxnovo 4S  -- 20xTP4056
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#10
Also, the 3s pack has a limited Ah capacity compared to the 4s. The cut out for a 12V battery is about 10.8-11V. If you build a pack at 11.1V, you're not far from cutout voltage. Whereas at 14.8V, you have a lot longer run time well within the safety margin of the cells.
Remember, your car battery is charged up to 13.8V and the alternator puts out a charging voltage of about 14.2 - 14.8V. So most devices designed for 12V use can handle up to 14V input without issues. Usually they are designed for 16V max as they have a regulator to drop the voltage down (or resistors to kick it down; though not as efficient)
Proceed with caution. Knowledge is Power! Literally! Cool 
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