Search found 4354 matches

by methods
May 21 2020 12:37pm
Forum: Battery Technology
Topic: 18S LiPo Wiring diagram
Replies: 24
Views: 524

Re: 18S LiPo Wiring diagram

Final thought I have been a practicing Electrical Engineer for 20 years post bachelor, including being a Tek. I know every aspect of troubleshooting (hands on or remote) as well as the detailed design and algorithms of BMS design. I.E. I could make that BMS. When I started here I did not even know w...
by methods
May 21 2020 12:25pm
Forum: Battery Technology
Topic: 18S LiPo Wiring diagram
Replies: 24
Views: 524

Re: 18S LiPo Wiring diagram

Appreciate your responding so fast methods. . . Anything I can do I only come over here when someone points out a question to me. :bigthumb: I answer in bursts from the hip.. because if I do not... then I never get it done. I used to have lots of time to ponder this stuff and work up detailed and c...
by methods
May 21 2020 12:21pm
Forum: Battery Technology
Topic: 18S LiPo Wiring diagram
Replies: 24
Views: 524

Re: 18S LiPo Wiring diagram

The person who made the original BMS wiring doc used BLUE to call out things which require double wires and black to call out the most negative. There are any number of reasons for "funny wiring". Looking at that BMS, it looks as if it were function-built for a specific purpose. Someone then adapted...
by methods
May 21 2020 12:11pm
Forum: Battery Technology
Topic: 18S LiPo Wiring diagram
Replies: 24
Views: 524

Re: 18S LiPo Wiring diagram

Per the request, I have confirmed that the diagram on the left is electrically the same as the diagram on the right. methodsCheck.png I do not have the hardware in front of me I have not confirmed the wiring colors of the balance taps I just went pin for pin to confirm. If hardware was here we would...
by methods
May 21 2020 12:03pm
Forum: Battery Technology
Topic: 18S LiPo Wiring diagram
Replies: 24
Views: 524

Re: 18S LiPo Wiring diagram

Hey John Yea... other things could be wrong for certain. ... As far as the diagram, I did not look super close. I will do that now. -methods A lot of that went over my head That will tell you if the 4.6V is a bad reading (due to 3-5 things) or an actual reading. Besides the "what else could be wrong...
by methods
May 21 2020 12:01pm
Forum: Battery Technology
Topic: 18S LiPo Wiring diagram
Replies: 24
Views: 524

Re: 18S LiPo Wiring diagram

(I am doing other things - posting to this between them) Now that we went over basic BMS architecture that can cause those ghost readings (protection diodes, stray current, accumulating caps) - here is my high level analysis: Everything looks fine right up to cell 13, then cell 14 is reading high an...
by methods
May 21 2020 11:50am
Forum: Battery Technology
Topic: 18S LiPo Wiring diagram
Replies: 24
Views: 524

Re: 18S LiPo Wiring diagram

I did not look at the BMS screen close enough (I always focus on the wiring first) I would disconnect the pack from the BMS and confirm the resting voltages of the cells and that the wiring matches the definition of "correct". I presume cell 8 is red because it is discharging or the highest "normal"...
by methods
May 21 2020 11:38am
Forum: Battery Technology
Topic: 18S LiPo Wiring diagram
Replies: 24
Views: 524

Re: 18S LiPo Wiring diagram

Plug in a standard 6S "RC Pack Checker" and write down all the cell voltages. Alternately, you can check them with a DMM, just be careful because it is easy to short out the probes. That will tell you if the 4.6V is a bad reading (due to 3-5 things) or an actual reading. Individual cells can absolut...
by methods
May 21 2020 11:28am
Forum: Battery Technology
Topic: 18S LiPo Wiring diagram
Replies: 24
Views: 524

Re: 18S LiPo Wiring diagram

I see some misinformation in this thread. First - there is absolutely no intrinsic issue using any "BMS" with hobby type packs. A 6S hobby type pack is nothing more than 6 cells in series with the interconnects pulled out on a JST-SM-7 connector. That will resolve exactly the same as a string of 18...
by methods
Mar 28 2020 12:36pm
Forum: E-Bike Technical
Topic: KiCad as a free Engineering Tool
Replies: 12
Views: 202

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: 202

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: 202

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: 202

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: 202

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: 202

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: 202

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: 202

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: 202

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: 202

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: 202

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: 202

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: 16200

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: 16200

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: 908

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: 2628

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...