Electrification of a Ninja 250 - Everything You Never Wanted To Know About Contactors

Overview of MOSFET vs Electromechanical switching, what parameters are used to specify contactors, and selecting a contactor for my project.
This is the second in a series about electrification of my ninja 250
Garage video shot with a Canon Vixia HF R800
Blue-screen chroma keyed and desktop screen captured with OBS
Webcam footage captured with Logitech C270
Microphone used at the at the computer is a Blue Yeti
Video edited together using Lightworks
www.buymeacoffee.com/lightnin...
Memes and other images from the internet used in this video fall under fair use guidelines: "Under the fair use doctrine of the U.S. copyright statute, it is permissible to use limited portions of a work including quotes, for purposes such as commentary, criticism, news reporting, and scholarly reports."
0:00 Intro
1:15 Solid State Switching (MOSFET)
3:18 Electro-Mechanical Switching (Relays and Contactors)
7:01 Contactor Procurement
10:28 Finding a contactor on Digikey.com
14:48 Wrap up

[@peteristhegreat]

This feels like some of the best explanations of applied electrical engineering for auto-mechanics/mechanical engineers and mechatronics design and procurement. Fantastic explanations and well timed memes. Digikey and mouser and other electronic procurement seems so hard compared to amazon, but the way you break it down, it seems much more approachable. Awesome video.

[@mikewinkler4055]

Nice video. In the project I worked on there were 2 switches. I had a physical disconnect breaker that I put in line with the battery and the motor controller had a kill switch tied to the key. Lots of ways to skin that cat.

[@lightningfrog27]

Thanks for the kind words, and also for sharing about your project!
Im just now starting to look how Im going to wire everything up. Im currently leaning towards having the key turn on the accessories (including the DC-DC converter), and then have the kill switch operate the contactor.
Hopefully my videos are adequately presenting the information and how i made my design choices without implying that there's any single "RIGHT" way to do it.

[@lezbriddon]

just had one set of mosfets go short in my cheap ebay 3kw(dont laugh its only a city shopper!) motor controller, fortunatly while i cheaped out on the controller i bought a bms i like the construction of and it detected the short and disconnected the battery before my fuse even had time to blow.
it also every half minute tried to turn back on and tripped again still not blowing any dinosaur slow fuses. i'll be contacting the manufacturer because if its detected a short its silly it tries to turn back on every 30 seconds...
replaced the blown shorted mosfets in the motor controller with quality ones and alls good again.

[@lightningfrog27]

No judgement here! one of the barriers to broad commercialization of electric motorcycles is that every single rider will have a slightly different use case, making it hard for the OEMs to standardize and mass produce while also catering to their target market.
I havent researched fuses for my project yet....im guessing im going to need one that's rated for ~300 amps connected directly to battery positive?

[@KermKerm420]

Those pesky projects love to throw you for a loop... but my MAN LIGHTNINGFROG27 isnt here for it, HE IS THE PROBLEM. my man