Supporting that theory: my HP EliteBook does have a slide-over cover.

(It could also be contention between thickness of the display vs enterprise customer sensitivity to cameras)

Many caves are not particularly wet , slippery, or prone to flooding. Only a few have issues with a lack of airflow. I understand the interest in robotic exploration for some specifically risky caves, but I don't like this generalization that implies all caves are too dangerous for humans to enter.

We might need some superconductors to make use of a voltage that low across distances that great. But we have been making progress on higher-temperature superconductors....

Still, don't hold your breath. We have this awesome geothermal temperature gradient, with hot rocks underneath us if we just dig down a few kilometers, occasionally less. Unfortunately, it's only cost effective to use in a rare few places.

To save someone else the time spent looking:

The data recording setup they are typically using only works for air-to-water heat pumps, like you might use to heat water for radiators. They rely on a 'heat meter' that measures the water flow rate and temperature.

Typical setup: https://shop.openenergymonitor.com/level-3-heat-pump-monitor...

If your system is a typical US air-to-air 'split' system, you probably have a long loop of refrigerant in a pressurized tube to carry the heat. To measure efficiency, I think you either need to measure air flow accurately inside or outside, or measure refrigerant flow rate. Either one harder than the commercial meter for hot water.

So, no easy drop-in COP measurement for me.

Related:

A collection of device configurations for commercially-available hardware: https://devices.esphome.io/

A collection of Tasmota configurations for devices, many of which can also run ESPHome: https://templates.blakadder.com/

My attic is insulated at the roof sheathing, not the ceiling. My attic is basically 'inside' the house, from an airflow perspective. It peaks around 87°F in late June. Not ideal, but workable.

That first link seems to talk about voltage swings, not frequency changes, doesn't it?

I do understand that the loss of rotating interia in the grid generation mix is a concern long-term. (See concerns from a report like https://www.osti.gov/servlets/purl/1854457 ), but I hadn't seen any charts showing that we were less frequency stable than in decades past.

I don't get how the latest inverter from Enphase is a specific solution. What does the IQ8 do to help grid stability? I'm legitimately curious. I know many inverters do some kind of frequency -control for curtailing power output, is that what you mean?

I agree, but noting one downside to the Volt and other plug-in hybrids: the complexity.

There's a lot that can go wrong when a car is in any kind of collision. EV have 'scary' high voltage cables that many repair shops don't want to deal with, but they make up for it with simplicity. Plug-in hybrids have almost all the complexity of both, combined.

My Volt ate some road debris, and it punctured an oil intercooler and two of the three glycol water loops, partly because the radiators sit quite low in a very full engine bay. I suspect many EVs would have been simpler to repair.

The complexity also just makes the product harder for potential customers to understand.

Now, I still like the car, and it has paid for the price premium in saved gasoline. Plug-in hybrids are a great middle ground between ICE and EV. I just wish the concept had sold better.

+1 I've also been bitten by this.

The low production volume of the Volt meant that the 1st generation Volts suffered from a poorly designed regulator on all windows, so the power window stops working. Those need to get replaced 5-8 years in. The battery coolant sensor is also poorly designed and if you ever get the dreaded SHVCS message, will prevent the Volt battery from charging. The dealer then rips you off asking for $2000 for what should be a 15min repair. /rant

Aside from these small things, I've loved the Volt and the 40mi is perfect for the average commute. Wish GM invested more in Volts instead of Bolts, which are way less aesthetically pleasing.

I'm excited to watch 3,400,000 kg of fire sprayed at water, concrete, and hopefully open air.

I'm more interested in what that will make the rocket do, like move, though.

I am waiting to see the reaction of the different groups of human.

I believe some people will react to 11 million pounds going three times the speed of sound, but I also believe more people react to someone who says dumb stuff on twitter

It's a 16 MW turbine, and the record it set is 384.1 megawatt-hours over a 24-hour period. So... 16.004 MW average. Basically, topped out the whole time (thanks to that "smart blade adjustment", whatever exactly that is.)

I would imagine that the smart blade operates similar to set of rotors on a helicopter, increasing and decreasing pitch of the blade. If the wind is too powerful, the blade can rotate to reduce the efficacy of the rotor, saving the motor and downstream systems.