snowwindwaves

Large power transformers have efficiencies in the 98-99.75% range.

I don't doubt switch mode could be smaller and cheaper up to some size, but I am struggling to see transformers larger than about 5 mva being replaced with power electronics.

Solar farms etc have inverters in modules I believe 500 kva each - and of course the power electronics are necessary there, there is no substitute.

I have a 20 MVA transformer that is nearly at end of life and would be open to cheaper replacements.

Are you saying large Transformers 1 mva, 10 mva, 100 mva, 500 mva are obsolete and should be replaced by switched mode power supplies? What mva is the threshold?

like you I hope I'm as present in my senior years! Female friends have entertaining stories about encounters with him from 17 years ago when he was 77!

what else have envy and greed driven? What would the world look like without those inate human emotions? It might be a simpler place but potentially the worst of history could have been avoided.

Wannabe's is pretty harsh for a group of people that started first and achieved their goals second.

Wannabe's never do the thing. They don't seriously try to do it. I have no reason to defend bezos but people made a serious effort there and they would not be wannabes even if they failed

I'm a wannabe for launching weather balloons and model rockets with my kids from the comfort and security of my well paying public sector job

You'll be a manager one day

Are there cities with land that isn't expensive?

In desireable locations the land cost is often more than the construction cost, so splitting that land cost across multiple dwellings makes them more affordable. Sure the cost per sq ft is higher when you are putting in three dwellings under one roof than for a McMansion, but you are getting three dwellings that in aggregate should be worth more than one McMansion.

I'm looking to sell my f150 in to these high used car prices and get an electric pickup for hauling my snowmobile. Self driving doesn't interest me at all. Cyber truck delivery is mid 2022. Hopefully it is cheaper than the long range f150 lightning.

Just to be clear vxworks is not bsd based that I could tell from Wikipedia. I work with Schneider electric plcs and sometimes vxworks errors bubble up.

I didn't realize that hydrogen is/will be commonly transported as NH3 ammonia before its end-use. I'm starting to see lots of articles about Ammonia as the transportable energy dense fuel of the future that could soon be flowing in pipelines.

It becomes an easy decision to get an electric f150 when gas costs $8 a gallon because of carbon taxes and a full charge is only a couple bucks

Both you and and animats are describing the same thing, brushless synchronous machine, which exists for long time.

Thanks for the great posts.

Have you seen any numbers for the life expectancy of grid connected batteries? I heard A solar project in Hawaii expects to replace the batteries every 5 years with daily cycles. So for California it would be $111 million /yr in battery costs. Manageable, but not a trivial amount to be factoring in to the cost of firming up the capacity of wind/solar.