Electronics > Beginners

Learning Path for buiding my own BMS

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Siwastaja:

--- Quote from: ogden on July 24, 2019, 09:32:42 am ---Yes, exactly - people differ. Your approach of picking tasks are fine - because you shall be considered skilled and knowledgeable, you know how stuff works.

--- End quote ---

Yes, but I have a history of picking projects before I was skilled and knowledgeable about things needed to complete them, sometimes quite... bravely, using a positive adjective. Or, deceivingly, using a negative one. This, OTOH, has forced me to become skilled and knowledgeable on the subjects. I have been a total n00b too, that's the point, and only maybe 10% of my learning has been through simple toy projects, the rest is through overselling my skills on overly complex projects and, finally, becoming actually skilled.  :phew:

And yes, I have been kicked out of projects at the exact point of time when I was able to finally solve the problem, based on the fact that it wasn't solved 6 months earlier when the schedule on Powerpoint said it was supposed to be. Sometimes it's ridiculously close, for example when I was hired to develop a complex automated battery pack factory prototype with direct copper sheet welding, CNC casing, full ground-up BMS design and all the jazz, to produce a large prototype 40kWh pack, promised in 6 months, spent a year designing and building everything, then got fired exactly when I got everything working for the first time and had already produced 25% of the final output agreed on, in a few days |O. They saw it producing the desired results, then they decided to ditch all the work and to start over with a new team "because it's taking too long": needless to say, they never got anywhere so the project ultimately failed. It didn't fit into their Excel mindset. But that's when I commercialized everything by myself, hundreds of kWh produced afterwards. I went from a battery-no-one to a battery expert within just a year, because I had a complex project beyond imagination which forced me to stay interested and learn everything I could absorb, even though you could say that in the "original" sense, the project "failed".

ogden:

--- Quote from: Siwastaja on July 24, 2019, 09:48:07 am ---
--- Quote from: ogden on July 24, 2019, 09:32:42 am ---Yes, exactly - people differ. Your approach of picking tasks are fine - because you shall be considered skilled and knowledgeable, you know how stuff works.

--- End quote ---

Yes, but I have a history of picking projects before I was skilled and knowledgeable about things needed to complete them, sometimes quite... bravely, using a positive adjective. Or, deceivingly, using a negative one. This, OTOH, has forced me to become skilled and knowledgeable on the subjects. I have been a total n00b too, that's the point, and only maybe 10% of my learning has been through simple toy projects, the rest is through overselling my skills on overly complex projects and, finally, becoming actually skilled.  :phew:

And yes, I have been kicked out of projects at the exact point of time when I was able to finally solve the problem, based on the fact that it wasn't solved 6 months earlier when the schedule on Powerpoint said it was supposed to be. Sometimes it's ridiculously close, for example when I was hired to develop a complex automated battery pack factory prototype with direct copper sheet welding, CNC casing, full ground-up BMS design and all the jazz, to produce a large prototype 40kWh pack, promised in 6 months, spent a year designing and building everything, then got fired exactly when I got everything working for the first time and had already produced 25% of the final output agreed on, in a few days |O. They saw it producing the desired results, then they decided to ditch all the work and to start over with a new team "because it's taking too long": needless to say, they never got anywhere so the project ultimately failed. It didn't fit into their Excel mindset. But that's when I commercialized everything by myself, hundreds of kWh produced afterwards. I went from a battery-no-one to a battery expert within just a year, because I had a complex project beyond imagination which forced me to stay interested and learn everything I could absorb, even though you could say that in the "original" sense, the project "failed".

--- End quote ---

Again you mixing it all together - your n00b time with professional. You explain arguments addressed at complete beginner using your time doing very complex projects professionally when you supposedly were skilled way above n00b level. I doubt that you took 40hWh project w/o even knowing how BMS works. If yes, then you are insane.

[edit] Your failure to meet promised deadline by 6 months is proof that your approach of overselling your skills is seriously flawed. Patience or incompetence of company that allows to stretch 6months into 1year is phenomenal. You shall not be blaming powerpoint, nor said company. It was your failure of overselling your project management skills.

rstofer:

--- Quote from: redgear on July 24, 2019, 08:56:18 am ---Yep, I can program and I have worked with arduino's and Raspberry Pi's. What I don't understand is the electronic circuit part.

--- End quote ---

The thing is, sooner or later you will need to actually understand a datasheet and you may even want to understand how some circuit works.  Op amps, capacitors, resistors and inductors are all best understood with numbers.  Somehow, you just wind up calculating the time constant (and 3 dB breakpoint) every time you see an RC circuit.  Your brain gets wired that way over time!

Khan Academy has a EE track besides their renowned math courses.  Digilent has a "Real Analog" course.  Both of these are heavy into the math.  Not necessarily deep math until late in the programs but definitely using numbers.  Just a smidge (technical term) of calculus when dealing with energy storage devices (capacitors and inductors) plus algebra for passives.

Dave has some great Op Amp videos but, right up front, he uses Kirchoff's Current Law to show how the various amplifiers work.  These are trivial examples but KCL is key to understanding op amp feedback circuits.

Everything W2AEW has published on YouTube is worth a watch.  He does a terrific job with transistor circuits.

All of these things are side issues and can be learned as you wander along the path.  And remember, Ohm's Law is a LAW.  It's not a suggestion like speed limits.

redgear:

--- Quote from: rstofer on July 24, 2019, 02:55:01 pm ---The thing is, sooner or later you will need to actually understand a datasheet and you may even want to understand how some circuit works.  Op amps, capacitors, resistors and inductors are all best understood with numbers.  Somehow, you just wind up calculating the time constant (and 3 dB breakpoint) every time you see an RC circuit.  Your brain gets wired that way over time!

Khan Academy has a EE track besides their renowned math courses.  Digilent has a "Real Analog" course.  Both of these are heavy into the math.  Not necessarily deep math until late in the programs but definitely using numbers.  Just a smidge (technical term) of calculus when dealing with energy storage devices (capacitors and inductors) plus algebra for passives.

Dave has some great Op Amp videos but, right up front, he uses Kirchoff's Current Law to show how the various amplifiers work.  These are trivial examples but KCL is key to understanding op amp feedback circuits.

Everything W2AEW has published on YouTube is worth a watch.  He does a terrific job with transistor circuits.

--- End quote ---

Thanks a lot for the resources, this was something  I was looking for.

--- Quote ---All of these things are side issues and can be learned as you wander along the path.  And remember, Ohm's Law is a LAW.  It's not a suggestion like speed limits.

--- End quote ---

So what do you think is the best to start with? I started reading datasheets of ICs and trying to understand them, but some terms are very technical.
Thanks again!

mc172:
How about this?
https://sound-au.com/articles/lithium-charging.htm
https://sound-au.com/project184.htm

BTW, Siwastaja, cheers.

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