Begginers Guide to Processing 18650 Cells | Cell Database


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Bob's Powerwall Project
#1
Greetings Everyone,

I have already started collecting cells, of course everything is running extremely slow.... I have 2 OPUS and 1 IMAX. I originally thought of putting this in my basement but have since reconsidered that idea and will be putting the battery packs out in the garage which is separated from the house by firewall. My question is that the batteries will be about 75 feet from the my electrical panel, does anyone see problems. Also, in about a month Tesla Energy will be coming to install one of their turnkey solar systems which is rated at 9.1kW. Does anyone have a recommendations on how I let them know I do not want to buy one of their Powerwalls?

-Bob
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#2
75feet is fine if you run AC and cables that are designed for the current.

You can just tell Tesla to not install the powerwall? (Im not sure I see the issue?)
BlueSwordM likes this post
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Current: 10kW Mpp Hybrid | 4kW PIP4048 | 2x PCM60x | 83kWh LiFePo4 | 10kWh 14s 18650 |  66*260W Poly
Upcomming: 14S 18650~30kWh | Automatic trip breakers, and alot more
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#3
I am now researching the AC Coupler theory, my nephew is an electrician so he might be able to help. I am excited about the DIY Firewall and I am already invested in it, it would suck to find that there is nothing short of me buying a Tesla Powerwall. I am wondering if anyone else in this group has experience with the AC Coupler for grid tie system.
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#4
So I just got off the phone with the folks from Tesla Energy, they want to upsell me on the Powerwall2. They failed, any attempt to add third party batteries to the mix would void the warranty. I am going to do some research into this AC Coupling using a MagnaSine inverter or some other system. Perhaps more people would be interested in this thread. I have a couple hundred laptop batteries to scavenge but I only want over 2000 mA.

The guy from TE told me that I will still have to pay a customer charge of 10.00 a month... My system will produce about 3,000 kW a year more than I need.
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#5
Woohoo.... Up to 3 OPUS chargers... at this rate I might get 1680 cells sometime in 2019 Sad So far I have almost one pack done, waiting for my new soldering iron as I had to send back that cheap Chinese crap. I took the advice of Mike on this forum and bought a Weller. Since my solar will be installed by Tesla Energy I will have to adapt using a AC Coupling method. I have been looking at the MS4448PAE from Magnum Energy.

I have a question for anyone reading... Should my packs be Amp Balanced? Meaning my first pack will have 300 amps, if my next pack is say 250 amps won't things die when the 250 amps exhaust?

So do you calculate your total amps based on the lowest pacK?
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#6
(06-06-2017, 12:50 PM)Robert Baumer Wrote: I have a question for anyone reading... Should my packs be Amp Balanced? Meaning my first pack will have 300 amps, if my next pack is say 250 amps won't things die when the 250 amps exhaust?

So do you calculate your total amps based on the lowest pacK?

They should be close to being balanced, 250 vs 300 isn't good. To balance them easily, I don't build packs until I have enough cells for the entire string. I throw all the cells in a big box and mix them up, that way they're all randomly distributed between the packs you're building. Let's say you're building packs as you go and you come across a few high capacity cells. The pack that gets the high capacity cells is now going to be off balance from the rest. If you use the mix and randomize method, they're "more likely" to be distributed evenly.

Hopefully that makes sense. I'm still half asleep here.
Solar Setup: 9x 320w panels, PCM60X charge controller
Battery Setup: 14x 120 cell 18650 packs, 48v configuration

Recommended Items:
Opus BT-C3100, Cell Heat Shrink, 4-Cell Holders
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#7
if you put the packs in parallel, that wouldn't be any problem. But all packs connected in series should have nearly same capacity, as Mike said.

Btw, if you want to speed up the testing process, buy some cheap TP4056 charging PCBs, battery holders and a power supply (I use an older ATX from a computer) to pre-charge your cells after disassembling the battery packs. This way, the OPUS can proceed faster with the tests. I have 3 OPUS and can test 30-35 cells per day. Now, the bottleneck is me, because I'm not fast enough to feed the chargers with new cells... Wink

permanently on battery from:
- 2017/05/20 - 2017/07/01
- 2017/07/02 - 2017/07/25
- 2017/07/26 - 2017/08/16
-  2017/08/17 . ?
What's left:
my current grid consumption
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#8
(06-06-2017, 01:19 PM)owitte Wrote: if you put the packs in parallel, that wouldn't be any problem. But all packs connected in series should have nearly same capacity, as Mike said.

Btw, if you want to speed up the testing process, buy some cheap TP4056 charging PCBs, battery holders and a power supply (I use an older ATX from a computer) to pre-charge your cells after disassembling the battery packs. This way, the OPUS can proceed faster with the tests. I have 3 OPUS and can test 30-35 cells per day. Now, the bottleneck is me, because I'm not fast enough to feed the chargers with new cells... Wink

Let me ask you think, should I abandon my current process of "Discharge Refresh"? I was thinking that was the best way to get accurate numbers for a cell, I mean if the cell is going to go belly up, wouldn't doing a discharge refresh were the OPUS is doing 3 iterations of charge/discharge/test?
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#9
I think you are wasting time and electricity doing a refresh test (3 iterations). If the cell is bad, it's going to show poor performance on the first test, in terms of heat and/or low capacity.
Solar Setup: 9x 320w panels, PCM60X charge controller
Battery Setup: 14x 120 cell 18650 packs, 48v configuration

Recommended Items:
Opus BT-C3100, Cell Heat Shrink, 4-Cell Holders
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#10
(06-06-2017, 02:52 PM)mike Wrote: I think you are wasting time and electricity doing a refresh test (3 iterations). If the cell is bad, it's going to show poor performance on the first test, in terms of heat and/or low capacity.

Thanks Mike, changing my testing procedure.
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