I still recall the day several decades ago when I, as a young #ElectricalEngineering undergrad, was introduced to the concept of "negative #frequency". I was unsettled. I suppose my reaction to the idea of negative frequencies was like the Medieval mathematicians' reaction to Fibonacci's discovery of negative numbers. But after my head was properly bashed in by a couple of homework problems, this concept became as natural to me as the negative number and the negative time.

I am curious how civil, mechanical, and other engineering fields deal with the concept of negative frequencies.

https://www.europesays.com/2074165/ Junior solar technicians seek employment opportunities #AmandaDzivhani #business #ElectricalEngineering #GreenSolarAcademy #internship #jobs #LifeChoices #RyanGeel #SolarEnergy #SolarSkills #SolarYouthProject #SouthAfricanInstituteOfElectricalEngineers #unemployment

Job - Alert

Professur (m/w/d) der BesGr. W 2 - Solar Energy and Building Automation (Kennziffer 9076)

Deadline: 2025-05-28

Location: Germany, Amberg, Bayern

https://www.academiceurope.com/job/?id=7507

Can someone help us with:
Food (100 usd to be set for a bit)
Car windshield wash (4-16 depending where you get it from)
Bus engine coolant (it drinks coolent) (17-18 usd)
12v 100ah lithium ferris phosphate batteries with Bluetooth for power monitoring and power management for more stable power for our solar on our bus as we use it for cooking and surviving and more batteries means we can draw more power and have heating and cooling as well as charge car and let others in need use it and more batteries means the load is spread out more so less chance of electrical issues (every battery has to be the same and we can't mix chemistry nor voltages nor storage capacity on individual batteries) (200usd including shipping per battery)

https://www.paypal.me/inaraclocks

https://cash.app/clockworkdemon

So, I would like to #crowdsource a solution to an #ElectricalEngineering #EV problem.

I need to safely split a J1772 split-phase input into two parallel chargers inside a project vehicle. Each charger is capable of 3 kW. How would YOU do it?

Dumb question. I’m 80% sure but would love confirmation. Bc the internet answers are… Not great.

Power station’s solar input is rated at 220 watts max. I’d like to plan on 220 W, even on cloudy days. Let’s assume a 400 W solar array. As long as I don’t exceed the station’s voltage input cap, I should be fine w/ >220 W available on sunny days, right?

Bc it should only accept the amps at whatever voltage level we get, to arrive at max 220 W. Right?

Assumption is.. this is just like how a lamp takes whatever current it needs at 110 V, and not the full 20 amps available at my plug.

LOL @ German engineering YouTube. I can gather from context clues that this S word implies 3 phase to DC converter, though. Whew! #german #diy #electricalengineering

New instance, new #introduction!

I'm a #DataScientist with a background in #ReinforcementLearning and #ElectricalEngineering. Well, that's what my resume says, but really I'm a #poet and a SF/F #writer. I love to play #DnD and other #TTRPGs.

I use they/them pronouns, and "Dr." not "Mr.", please and thank you.

I maintain a blog at www.seanpatrick.phd which includes a current list of publications, including my debut sonnet collection, "Love, Death, and Other Surprises."

We have a little solar powered water wiggler that ended up submerged and the NiCD battery died. So I got to take it apart, and as best I can tell, the solar panel, battery and motor were wired in parallel. Is it really that simple?!

I took electrical engineering in high school and on our Windows 95 PCs there was a super cool program where we could wire stuff up and see how it'd work, IRL. I wish I could remember what that was called. I always wanted that program at home...

EDIT: I just searched the web and there are a few online things all seem to require registration... dumb

I posted in the blog at #jmkengineering for the first time in a while and have a few more posts in progress.

This week it was Cookies and Project Management,

https://jmkengineering.com/decision-gates-and-cookies

I'm still debating wether I should have a separate account for work, but the more I think about it, the more that work seems to be.

So, I will tag all my work posts with #jmkengineering

I started writing my newsletter over there relatively consistently recently, you can check it out here - https://jmkengineering.com/nl

Idea.

Double Scott-T transformer configuration to go from three phase to four phase?

Instead of delta and wye, it would be “box” four-wire and “plus” five-wire configuration for four phase transformers.

Hey favorite nerds. My 17 year old wants us to take delivery of 14 used solar panels, Yingli and Mitsubishi, roughly 5' x 3' apiece, 230-255W.

He's a super smart kid with entrepreneurial leanings who has been passionate about #solar for years. (He has literally read the 80s SolarEx tech manuals, among other things- like, he chooses this as light reading.)

He is cagey about his plans, stating that they are needed 'for experiments' and that they can live in the basement when not in use. He did state solemnly that his arrays would be limited to 'four to five panels, positioned on the driveway.'

This is not my area of expertise, nor my spouse's. In fact, as is often the case with our kids, we are feeling a little outmatched.

What do I bottom line need to know or ask about what he could be planning to make sure that he's not going to be electrocuted, take down the neighborhood power grid, cause major accidental damage to property, etc?

So here's a pretty out-there question for you #electricalengineering types:

Does there exist a 1 henry inductor rated for 1 ampere of current?

(I have a back-up plan if not, but I would like to be pleasantly surprised, and hopefully not sticker-shocked, if such a... *thing...* exists.)

Randomly remembering one of the most interesting modes of communication I learned in electrical engineering/signals class. Meteor-burst communication. It's too unbelievable to describe but the tl;dr is bouncing VHF signals off of incinerated meteor trails to hundreds of miles away.

https://www.electronics-notes.com/articles/antennas-propagation/meteor-scatter-burst-communications/basics-tutorial.php

Real (kW), reactive/phantom/imaginary (kVAR) and apparent (kVA) power relationship demonstrated in delicious beer form! #electricalengineering #electricity