Since it's not a battery storage setup, the energy being sent into your home circuit alleviates demand by a small amount. Where did they come up with 10 to 25% savings? Factors such as an optimal view of the sun for as much as possible, south-facing or biased East or West, would be the max. payoff. Night would be a zero net gain. At a savings of $7 a month, the panel would pay for itself in maybe 10 years not factoring in government subsidies. You need to keep it clean as well for it to maintain its potential output.
Stuff like your fridge can use a fair chunk of power continuously and a small solar setup can offset that when the sun is out. Same with routers, chargers, standby devices, TVs, etc.
For a 800W setup, 4–5 kWh on a very good summer day is plausible. Over a full year, it's going to be something like 600–900 kWh depending on orientation, shading, and location. So in strong summer months you might get something like 80–120 kWh. But you won't be able to use all of that unless you have a battery.
However, A typical apartment in Germany is not using that much electricity. Roughly speaking, a one-person place might use around 160 kWh a month and a two-person place around 270 kWh. Finding a use for 20–30 kWh a month during sunny periods. That's how you get to 10%. 25% might be harder but doable if you could somehow have a battery soak up the excess power. I don't think there are a lot of plug and play solutions for that yet. But it should not be that hard to do technically.
Power in Germany is relatively expensive 160*0.40 is about 80/month for me. I pay a bit less than that because I use less power somehow. But still, that's is close to 1000 euro per year. Saving 100 per year means the whole setup would earn itself back in 2-4 years (most plug and play setups you find on amazon are between 200 and 400 euro). And depending on where you live you can actually get some of that back via subsidy. But it basically pays for itself even if you don't. Unless like me your balcony faces east and you only get a few hours of sunlight in the morning.
I did really rough math and a hypothetical 200W panel getting 100% sun for 5 hours per day (1 kW/hr) would net you a whopping ~$9.30 in savings per month. We're paying something like $0.31 per kW/hr in NYC and it's a lot of money right now.
Did your calculations account for the suboptimal angle of the panels in most balcony solar setups? Most calculators assume the panels are at an optimal angle or on a roof pitch, not vertical like the image in the article.
A setup like the image in the article is going to get much lower than optimal efficiency because the panel is mounted vertically. She could be netting closer to $2-3 dollars per month or even less depending on which way she’s facing.
Yes, and I think it's important to highlight that Iverson would write APL on chalkboards and paper when working on math at times. I am sure some people here can hand write a program, but it seems so much more akin to writing math. I am in J daily, APL once in a while, Uiua more frequently, but J is the only one I actually write in my journal and then try it on my J phone app or when I open up my laptop. The intro books for J are great for working through math and learning J - Concrete Math for Computing in J; Easy J; Calculus; Arithmetic - https://code.jsoftware.com/wiki/Books
Yes, a strong argument, and staying in a line of PLs: F# for high-level, and F* <-> Low* for theorem proving and low-level coding. I am evaluating F/Low for verified code on Cortex M processor that I am currently trying to write SPARK2014. The Cortex A processor is running seL4 for less safety-critical tasks. I did look at Lean4 as a scratch for my Idris2 itch use cases.
Looks great! Nice work.
I am steeped in CAD for my work flow, so I used to program AutoCAD in AutoLISP, Rhino in Rhinoscript, now F#, and FreeCAD in Python as well as Blender. They have the geometry engines built-in and tested over decades. I think this is good for the maker with a 3D printer to do parts that are relatively simple (not discounting parametric code to make complex shapes here). Industry needs integration of CAD, BIM, CAM, Viz, etc. Take a look at this now older (2014) project where Rhino and F# were used to design and manufacture complex geometry for a real world build: https://www.youtube.com/watch?v=ZY-bvZZZZnE
Agreed. When you zoom in, even the normal life stuff can give you concern. I showed my kids what creatures live on their and others' bodies. You have millions of microscopic arachnids called Demodex mites living in your hair follicles and sebaceous glands, particularly on your face. My wife gave me an evil look as I showed my children this fact in online vids and pics. Granted these are symbiotic/parasitic relationships of life, but still, the closer you look, the more you see!
Correct, not millions of Demodex mites, which are usually in the hundreds to thousands on a typical, non-infested human. The millions should be the general amount of mites and other symbiotic/parasitic on and in your body. Thanks!
I have loved math since I was a child, and I think it depends on when you grew up and how steeped you are in reality vs. the virtual or the computer world, and how much of an abstract vs. concrete thinker you are. I was always making things in modeling clay, that greasy grey-green stuff, and so my scale was what I could make out of one brick of such stuff. I bought my first computer in 1977 (Commodore PET 2001), and the CBM ASCII set had some graphics, but nothing compared with today's graphics. My first encounter with visualization and scale was writing a program to let me know which of the four moons of Jupiter I was seeing in the sky that night. Io, Ganymede, Callisto, and Europa's orbits are almost edge-on to our view from earth, so I made Jupiter a capital O, and the moons were lowercase letters. I printed this out on a thermal printer (like a wide receipt). Cosmos was the rage on TV and I had read Einstein's Universe by Nigel Calder. I had a telescope and a microscope, so the micro and macro were very real to me. I suspect if you grew up on tablets and only built things on a 3D printer scale, you don't have that unbridled sense of the small and large except on very abstract terms. However, not a donut, not a universe-scale torus, but rather a pool donut comes to mind when I first hear torus!
I built an XYZ router table in the early 2000s out of old stepper motors. It was 8'x4', and I built stitch-and-glue wooden kayaks from the panels I cut on it. These would wind up being 16 to 22 foot long kayaks to go into the real world and have fun!
Some related good books I have been studying the past few years or so. The Spark book is written by people who've worked on Cube sats:
* Logical Foundations of Cyber-Physical Systems
* Building High Integrity Applications with SPARK
* Analysable Real-Time Systems: Programmed in Ada
* Control Systems Safety Evaluation and Reliability (William M. Goble)
I am developing a high-integrity controls system for a prototype hoist to be certified for overhead hoisting with the highest safety standards and targeting aerospace, construction, entertainment, and defense.
I am teaching myself Arm assembly for the M-series of processors, M-4 for now. I have been playing and using J (jsoftware.com) since 2010, and I have to say that as much as the higher abstracted languages and programs become, I still love the atoms and terseness of array languages and writing close to the metal. I started with Factor, gforth, and retro years ago. Something magical happens when you immerse yourself in it. Right now, I am working with KlongPy, which using the PyTorch backend along with the Klong language is amazing. I used to write assembly code for my Vic-20 back in the day and then bought the VIC FORTH cartridge for like $30 in 1982. I programmed my 1977 PET 2001 in the Commodore Basic 1.0 it came with, but there was a sys instruction for machine code! I used to write my code on an index card before typing it in and saving to the cassette recorder. Magazines had code to hand type in, so my coding was learned with reading and writing it first. I accidentally bought a hardcover book on PDP-11 programming and read the whole book before I bought my PET in 1977. Machine language.
I miss the early days of computing before the internet or Genie Online, but Echo in NYC was a blast - thanks, Stacy!!
A lot of effort under Biden was to make diinformation a big push and they offloaded work to third parties, so I'd be curious to know how many of the firings or resignations came from the government being pulled away from censorship in league with social media as opposed to losing harscore cybersecurity professionals. Makes me want to jump back on the cybersecurity bandwagon. I think the the CISA and NSA mandate for memory-safe software roadmap is good. I'm more of a SPARK 2014 fan than Rust, but I think by 2027, I'll shift to 30% focus on Rust and see where the government contracts go. I'm building a high-integrity secure, mostly formally verified automation and controls software for a state-of-the-art portable hoist able to function in aerospace that I am also co-engineering with my partner inventor.
> the government being pulled away from censorship in league with social media
The right sure said that a lot, but it repeatedly failed to materialize. The twitter files were especially embarrassing, where Elon alleged government censorship but his "detective" was forced to admit that it didn't exist. Oops!
> [@mtaibbi] Although several sources recalled hearing about a “general” warning from federal law enforcement that summer about possible foreign hacks, there’s no evidence - that I've seen - of any government involvement in the laptop story. In fact, that might have been the problem...
Contrast this to "we can do it the easy way or the hard way" from the current administration. Yikes!
I think I would have left much sooner if I were there. Iran has claimed this January to have tested a 10,000 km ICBM with Russia allowing it to fly towards Siberia. This puts NYC and East Coast possibly within range. The claim has not been verified, but given the vitriol between the US and Iran, if they have it, and we overwhelm them with naval and air force presence, we may provoke a real world test of their claim.
What would targeting NYC help Iran? Aren't there more interesting targets they could go for which would take advantage of the inflamed political situation in the US?
I think it's much more likely that they would strike back at a regional ally if anything. Keeping some of their cards hidden and not risking a unifying shock to the US populace
Iran's leaders are caught in a trap of their own making. For decades they've held up America and Israel as villains and used that boogeyman to justify their military and police expenditure.
After this Israel-Gaza war, Iran's proxies who fought Israel on their behalf (Hamas, Hezbollah) are mostly destroyed. Their allies in the Gulf States (Qatar) have buckled to US pressure over the war. When they've tried to strike Israel directly, combined US-Israeli antimissile defenses stopped it dead in its tracks. Now hundreds of thousands of protestors are thronging the streets and the regime realizes it cannot kill or jail all of them.
In short, Iran has realized that its conventional military will not be able to prop up the regime if anyone decides to attack or arm a rebellion.
That's the motivation for this. The hateful theocratic rulers of Iran see the US as a bigger threat, and are chasing a nuclear weapon as the one they might actually get some protection with.
The other reading is that Iran tried pursuing nuclear power through legal means (since the 50s!), but deals were reneged and obstacles were put up at every turn. They then pursued enrichment on their own terms while keeping the door open for negotiation.
But Israel and the US do not want to negotiate. The empire wants to neuter Iran’s capabilities by force, hence the escalation and ongoing threat of war.
In fact, I would argue that Iran has proven time and again to be a much more restrained and diplomatic regional power than Israel. At best, it’s the pot calling the kettle black.
Also, defeating Iran is not going to be as “simple” as it was with Iraq. They are a resilient people with a long history of struggle in a country with highly defensible terrain. The opposition is overblown, and was actually damaged after the 12 day war as it ended up rallying many Iranians around the flag. Read up on the Iran-Iraq war to see what they’re capable of.
Your argument of "Iran is just a misunderstood peaceful state!" is somewhat undercut by the fact that the multiple leaders of Iran have sworn to destroy Israel by any means necessary, and the even more inconvenient fact that Iran is objectively ruled by an awful regime which the world will not miss.
Iran doesn't need to be defeated, it needs a revolution. Iranian people are great and deserve a better government.
I don’t think modelling Iran as a monolithic political actor works anymore.
Between the IRGC, President, clerical ranks and others, I’m sure, some groups may benefit from striking New York or even inviting American retaliation in ways that don’t make sense for the country as a whole.
They’re suggesting that threats about Iran attacking US cities serve the same purpose as the propaganda about Iraq harboring WMDs. To gin up the public for war.
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