Charging Your Tesla Model 3 With Just A Wall Outlet | 25 Amp Circuit Breaker

Something about your calculation here doesn’t make sense to me. 117 EV miles, and I estimate a Niro like this will get roughly 3 miles per kWh (that’s what my Volt does roughly). That means 117/3 = 39 kWh used. 39 times your cheap electricity rate is $2.54, not $7.61.

not exactly mains but when i was a kid i enjoyed playing with photoflash caps and at one point had one fully charged to about 330V and discovered the negative post to the AA battery was also connected to the cap and put the entire shot up one arm, across my damn heart and out the other arm, my whole body locked up for only about a second (maybe 2) and i think i fell over (like people in taser videos but i was sitting). it sure shook me up and im glad it was only a small cap

Or the other takeaway is that only some piece of esoteric surplus made several decades ago is the right thing for the job and then one can go have a philosophical crisis about whether at this point we’re just plundering the ruins of a failed civilisation or not.

I learned even more respect for shock hazards on the job one day when I was working for a military contractor. I forgot to turn off the 400VDC B+ supply to a radar driver assembly before I put one hand on the metal chassis and grabbed the fins of a lighthouse tube with the other hand. After that I put my head down on the workbench and had me a rest for a few minutes. Even when you know better, one moment of inattention can be the end.

I suppose a more flexible grid, with more cheap gas plants, which can fire up quickly, made this possible, as well as making the grid itself smarter. There was a rush to build gas power plants a while ago, since of course gas isn’t going to run out any time soon or anything.

Now that’s something … And for other commenters: of course exposed mains voltage is dangerous, lethal even. But why would it need to be exposed? It could be made like Davic’s hack, or in countless other ways that are safe. Hide heating element under thermal mass, use secure connectors and proper grounding.

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The 20% derating is not something that everyone just knows, its part of the NEC. A 12AWG cable is actually capable of handling 30 Amps, but not according to the NEC’s derating requirements for wire temperature rise limits.

A steamy day on the flat roof of a building will let you feel how many inches the 480 can sting your fingers from also.

As someone who started playing with electronics in the days of B+ in the 350VDC range with double that across the main xformer’s secondary, I was utterly appalled at the idea of tying myself to a hard ground when working with some of the newer (for the time) solid-state stuff that was coming out. We had a respect for high voltage then that is often missing these days, this article is an excellent reminder that this is still needed.

“If you can power the logic side with some +5V derived from mains, there is no point keeping the optocouplers, right?”

The IEC61010 category ratings on an Agilent multimeter. Medvedev [CC BY-SA 3.0], via Wikimedia CommonsYour instruments such as multimeters, oscilloscopes, and their probes will all carry an appropriate safety rating for maximum voltage, surge voltage, and current. In modern equipment this will be denoted by specified classes each with their associated voltage defined under IEC 61010, though you may find older equipment with IEC348 or other national standard ratings (Fluke publishes a handy PDF explaining these standards in detail if you would like to know more). These ratings are important in ensuring that the instrument keeps you safe as you use it.