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by methods
Mar 28 2020 12:36pm
Forum: E-Bike Technical
Topic: KiCad as a free Engineering Tool
Replies: 12
Views: 109

Re: KiCad as a free Engineering Tool

See what I did? I laced a Technical Content Topic with a current affair. Some will tell you I did wrong. They will tell you to keep the topics clearly separate, start a new topic. I have no desire to make a Current Affair topic. That just attracts the mouth-runners, politicians, liars, and bullies. ...
by methods
Mar 28 2020 12:24pm
Forum: E-Bike Technical
Topic: KiCad as a free Engineering Tool
Replies: 12
Views: 109

Re: KiCad as a free Engineering Tool

Engineering Inhibition This is where a very useful or thoughtful or experienced person is hesitant to way in or help for fear of being incorrect in some tiny way. This is the reason we have informal discussions. . . where you need not be perfect... where you can let an idea fly that you feel uncomfo...
by methods
Mar 28 2020 12:17pm
Forum: E-Bike Technical
Topic: KiCad as a free Engineering Tool
Replies: 12
Views: 109

Re: KiCad as a free Engineering Tool

... a thought In Open Source Forum the way it works is this: * Original content, in tact, verbose * A second thread, more compact, validated * A third thread, only the validated cream - but references back to source. This allows for the refinement of content with preservation of the source. If you w...
by methods
Mar 28 2020 11:50am
Forum: E-Bike Technical
Topic: KiCad as a free Engineering Tool
Replies: 12
Views: 109

Re: KiCad as a free Engineering Tool

And... To get there I validate that you can use the tool KiCad. In full disclosure I have not finished a design with it or sent out Gerber. That said, I have tested the corners where I know trouble lays. They... were... a... bit "head in the clouds" in the way they implemented - but - what they impl...
by methods
Mar 28 2020 11:40am
Forum: E-Bike Technical
Topic: KiCad as a free Engineering Tool
Replies: 12
Views: 109

Re: KiCad as a free Engineering Tool

If you wish to measure high voltages you can do so by simply dividing them down. . . but that is quite the dangerous game and I suggestion doing it a little different. Where you can - Measure high voltages (+1,200VDC) with a completely isolated module that communicates its findings back over isolate...
by methods
Mar 28 2020 11:36am
Forum: E-Bike Technical
Topic: KiCad as a free Engineering Tool
Replies: 12
Views: 109

Re: KiCad as a free Engineering Tool

For driving signals. . . we do all of this with Active Low. We do nothing more than close a switch to ground... so whatever you are controlling (A big contactor) has power to its lead and it seeks a ground path thru you. This ground path can be completed with a Transistor, a Mosfet, a reed switch, a...
by methods
Mar 28 2020 11:27am
Forum: E-Bike Technical
Topic: KiCad as a free Engineering Tool
Replies: 12
Views: 109

Re: KiCad as a free Engineering Tool

My tip for the decade is to break up your grounds. On my circuits, I have the following grounds * Digital Ground * Analog Ground * Power Ground * Earth Ground * Various Isolated Grounds Digital ground is the most obvious and protected. That is just your uProcessor ground. Analog ground is of course ...
by methods
Mar 28 2020 11:17am
Forum: E-Bike Technical
Topic: KiCad as a free Engineering Tool
Replies: 12
Views: 109

Re: KiCad as a free Engineering Tool

I should start by saying that I read none of the documentation and I just jumped into KiCad with my Eagle Knowledge. That I have found I found thru experimentation in the rudest form. Here is a boilerplate of my AmpSealed Mega Feather SCH.png You will get into trouble with versioning. . . so RULE WI...
by methods
Mar 28 2020 10:53am
Forum: E-Bike Technical
Topic: KiCad as a free Engineering Tool
Replies: 12
Views: 109

Re: KiCad as a free Engineering Tool

As a Time Stamp and proof of Authenticity I offer this. IMG_20200328_084035.jpg That is the Anemone I have been captive breeding for 3 years now. He just got a big mouthful of Mysis Shrimp. IMG_20200328_084027.jpg There are two of the captive bred babies that came from the mama. They are eating righ...
by methods
Mar 28 2020 10:27am
Forum: E-Bike Technical
Topic: KiCad as a free Engineering Tool
Replies: 12
Views: 109

Re: KiCad as a free Engineering Tool

As for Validations and DIY work. . . I recently eliminated NextDoor from my sphere. Just like any forum they get a mix of folks. . . but here (a technical forum) we at least have Logic and Reason and Proofs and Tests to settle arguments. On next door they have the worst kind of ethos brewing. . . po...
by methods
Mar 28 2020 10:11am
Forum: E-Bike Technical
Topic: KiCad as a free Engineering Tool
Replies: 12
Views: 109

Re: KiCad as a free Engineering Tool

I also recently validated AWS as a Cloud Base for low power IoT. I have Arduino's running that compile JSON test reports and fire those directly to AWS S3. You can then run node.js on the cloud to parse the JSON out to DynamoDB NOSQL tables for report generation. I also recently validated a few SIM ...
by methods
Mar 28 2020 9:55am
Forum: E-Bike Technical
Topic: KiCad as a free Engineering Tool
Replies: 12
Views: 109

KiCad as a free Engineering Tool

It is well known that I have always done my development in Eagle. This is because it was free/cheap and this is the tool my mentor taught me on. Many tried to get me to move over to KiCad, I held out over 5 years. I just completed a design transition. * Porting projects from Eagle * Porting GitHub E...
by methods
Mar 16 2020 8:31am
Forum: Technical Reference Area
Topic: Using EV Chargers
Replies: 102
Views: 15034

Re: Using EV Chargers

I previously turned down work in this area. TWICE :confused: Even when I was out of work. There were 3 reasons for that 1) I was rusty with the HTTPS Stack, but I just got done doing a bunch of this for building a 3G IoT solution straight to AWS . 2) A cooling off period was required, as I had just ...
by methods
Mar 16 2020 8:13am
Forum: Technical Reference Area
Topic: Using EV Chargers
Replies: 102
Views: 15034

Re: Using EV Chargers

Here is a very useful link: CCS (Combine Charging System) Design Guide: http://tesla.o.auroraobjects.eu/Design_Guide_Combined_Charging_System_V3_1_1.pdf Untitled.png Backup of that on my servers http://www.schindlerengineering.com/CCS/Design_Guide_Combined_Charging_System_V3_1_1.pdf If anyone has a ...
by methods
Mar 16 2020 7:25am
Forum: Electric Watercraft
Topic: What trolling motor to start with on sailing dinghy?
Replies: 7
Views: 661

Re: What trolling motor to start with on sailing dinghy?

I have had good luck with Minn Kotas I have picked them up used anywhere from $20 to $50 Most of what you will find are the 12V variety The 24V, 36V, or 48V flavors are much more desirable. The 12V flavor will run great off of any old Golf Cart controller, but be careful. You can melt the wires (lit...
by methods
Mar 05 2020 10:10am
Forum: Battery Technology
Topic: Paralleling uneven voltage cells?
Replies: 49
Views: 2147

Re: Paralleling uneven voltage cells?

Last thought - and sorry to blast post, I am on the run over here. As wire gauge (cell connections) drops in AWG there is a limiting effect that comes into play. Fetchter turned you on to it when he said "if not hot, ok". What is going on is a bit of Self Heating and a lot of Inline Resistance Volta...
by methods
Mar 05 2020 9:51am
Forum: Battery Technology
Topic: Paralleling uneven voltage cells?
Replies: 49
Views: 2147

Re: Paralleling uneven voltage cells?

Just caught this in review. wisdom.png eMark You are effectively making an argument of character attack as a counter argument to a subject where you have miss-understood the findings. Hobby King Packs = Connected by tiny wires at the cell level Buss Bar Packs = Connected by heavy gauge Please focus ...
by methods
Mar 05 2020 9:42am
Forum: Battery Technology
Topic: Paralleling uneven voltage cells?
Replies: 49
Views: 2147

Re: Paralleling uneven voltage cells?

The idea is to keep the initial current below the rating for the cell. ..... Happy to run a test of the impulse current for Small AWG vs Large Busbar using calibrated equipment if anyone would like. I did not see impulse currents any larger than I see "bouncing around" during normal use. I admit th...
by methods
Mar 05 2020 9:34am
Forum: Battery Technology
Topic: Paralleling uneven voltage cells?
Replies: 49
Views: 2147

Re: Paralleling uneven voltage cells?

Please do not take technical information out of context and misrepresent it. In the proof I presented I am making cell connections thru long runs of small AWG wire . That in no way implies that you can crowbar the same with a buss-bar, or scale the solution up to more than 1S. My view is not contrar...
by methods
Feb 03 2020 5:03am
Forum: Battery Technology
Topic: Paralleling uneven voltage cells?
Replies: 49
Views: 2147

Re: Paralleling uneven voltage cells?

I hook piles of 6S 5Ah 20C Hobby King packs together at the cell taps using parallel boards all the time. Cells are off by gobs, I dont even look. Maybe one pack is 18V, other pack is 19.2V. Does't matter in practical application. Never had hot wires (tho they are silicone high temp) Half my packs a...
by methods
Feb 02 2020 11:33am
Forum: Battery Technology
Topic: Paralleling uneven voltage cells?
Replies: 49
Views: 2147

Re: Paralleling uneven voltage cells?

Now we go back and back-Calculate to ensure previous Tests/Readings were True and Correct 1 cell carrier = 183mOhms @ half an amp load 2 cell carriers = 366mOhms In the previous test we had a differential voltage of apx 100mV 100mV/366mOhms = about a quarter amp I witnessed about a tenth of an amp. ...
by methods
Feb 02 2020 11:23am
Forum: Battery Technology
Topic: Paralleling uneven voltage cells?
Replies: 49
Views: 2147

Re: Paralleling uneven voltage cells?

Follow On Information "Kevin Measurement" or "4 wire measurement" is a method by which you can eliminate loss over the wiring. To determine wiring losses on the test I performed *Cell in Carrier *Resistor hooked up, dumping half an amp 1) Measure voltage across batteries, right on battery terminals...
by methods
Feb 02 2020 11:04am
Forum: Battery Technology
Topic: Paralleling uneven voltage cells?
Replies: 49
Views: 2147

Re: Paralleling uneven voltage cells?

Based on the findings above, and barring any proof to the contrary, I will make the following statement of Fact "You can absolutely wire up 2pcs of high rate 18650 cell that are off by 100mV using the method shown below without any risk of fire or damage to the cells" Amazon Prime Link: https://www....
by methods
Feb 02 2020 10:58am
Forum: Battery Technology
Topic: Paralleling uneven voltage cells?
Replies: 49
Views: 2147

Re: Paralleling uneven voltage cells?

FINAL TEST TEST SETUP Batteries pressed together, negative to negative, with high force One FLUKE lead on the Positive of each Fluke set to high current mode Reality Check Shorting out a cell like this results in a reading of 26A TEST RESULTS 360mA observed Thoughts "The test setup is EVERYTHING on ...
by methods
Feb 02 2020 10:53am
Forum: Battery Technology
Topic: Paralleling uneven voltage cells?
Replies: 49
Views: 2147

Re: Paralleling uneven voltage cells?

TEST RESULT #2 Resting voltage immediately after test = 3.968V Temperature of resistors >60C (burns my finger) Proof of power transferred out of battery Resting voltage after a few seconds = 3.977V 3.977 > 3.968 Proof that battery voltage is still recovering (so delay) Resting voltage after a few se...