Earlier quoted context omitted.
It’s on the HN front page, I don’t think I’d extrapolate anything from its current power usage.
Ha. We better read it while we can!
Quick, everyone in!
This website has 81% battery power remaining
231–240 of 365 posts
Re: This website has 81% battery power remaining
#232Earlier quoted context omitted.
> ... vanilla CSS... Sounds that feasible? Vanilla CSS is the other end of the spectrum, but the problem is there is apparently nothing between hand-crafted CSS and a full front-end framework. People, like me, who are not good at design will choose the convenience of the latter over going through the tedium of the former, even if we don't really want to.
You won't be a sculptor if you avoid the chisel. If in rome, do as the romans do. If you want to swim, you'll get wet. There is no design in/for the web without html+css, is there? Edit: by removing 3rd parties from your project you remove a lot of overhead and current and future risk. But be warned: Maybe your company sells exactly that for a good margin and you ruin the business model.
We don't want to sculptors. We have other projects that just happen to require a sculpture as part of finishing them.
> There is no design in/for the web without html+css, is there?
Only as much as there's no programming without assembly language.
Re: This website has 81% battery power remaining
#233It’s at 76% now. In 53 minutes since the post it has gone down 4%. So say roughly 5% per hour as a back of the envelop calculation. That’s roughly 20 hours on a full charged cycle. It would be good to know if there is a fast charge capability of the battery and how long would that be. An hour of full sun a day? Or two hours of partial sun?
They are using a 168Wh battery and a 30W panel, so a naive first approximation would be 168Wh / 30W = 5.6h to go from 0% to 100% capacity. In reality:
* The panel won't be pointed squarely at the sun most of the day
* The sun won't be high-noon-bright most of the day
* Lead-acid is about 80% efficient (perhaps 90% at low state-of-charge, dropping to 60% at high SOC)
* Lead-acid chemistry is sluggish. It can charge pretty quickly to 80% (a 168Wh battery will easily accept the full 30W up to that point), but the acceptance rate decays asymptotically toward zero as the battery approaches 100% capacity. No matter how powerful the charger, going from 80% to ~98% takes about 6-8 hours.
* 0% state of charge is about 10.5V, but lead-acid cycle life falls dramatically with deeper discharges. To reduce wear on the battery, they designate 12V as 0% charge and shut down at that point. This means they're only using 50% of the 168Wh capacity, but it also means they hit the sluggish part of the charge cycle sooner.
Summing up the above, with perfect-noon-sun conditions generating the full 30W, the charge curve will be roughly: 3h from 50% to 80% SOC (0%-60% indicated); 6h from 80% to 98% SOC (60%-100% indicated); a few more hours for the last 2%.
Realistically it will get the majority of the charge by early afternoon, and the slow trip from 80%-98% will complete sometime in the early evening. At that point the panel will only be producing a few watts, but it's still enough to finish trickle charging to 100%.
Re: This website has 81% battery power remaining
#234Reminds me of that Netflix show Clickbait. The more views the more it kills the site.
Re: This website has 81% battery power remaining
#235Earlier quoted context omitted.
I thought Moore’s Law is about the density of components on an IC—what about it suggests a constant energy usage of IC as it gets denser?
I believe ICs are limited by how fast you can cool them. All that energy goes into heat eventually, so temperature is going to depend only on total energy / area
Digression: Is it true that every single watt my CPU/server/electronics consume is ultimately turned into heat?
To put it another way, does a server under a constant 500W produce the exact same amount of heat as a dumb 500W electric space heater? Excluding things like the tiny amount of energy that gets sent out on CAT5 cables, which I believe still gets turned into heat just elsewhere.
I think this is true, but it’s still counterintuitive. Makes me think there’s something more useful we could make electric space heaters do with their energy and still produce the same amount of heat.
Re: This website has 81% battery power remaining
#236Earlier quoted context omitted.
I believe ICs are limited by how fast you can cool them. All that energy goes into heat eventually, so temperature is going to depend only on total energy / area
Digression: Is it true that every single watt my CPU/server/electronics consume is ultimately turned into heat? To put it another way, does a server under a constant 500W produce the exact same amount of heat as a dumb 500W electric space heater? Excluding things like the tiny amount of energy that gets sent out on CAT5 cables, which I believe still gets turned into heat just elsewhere. I think this is true, but it’s…
The only other places the energy could go are small - LED light, radio waves, sound. Almost all of it will go to heat.
Re: This website has 81% battery power remaining
#237How would I even host a website at home? 20 years ago I knew how to get a fixed IP from my local ISP but I don't know how to do that anymore.
A recent post on HN mentioned use of a Cloudfare tunnel. Apparently that allows for self-hosting behind a router with no incoming ports needing to be opened.
Re: This website has 81% battery power remaining
#238Earlier quoted context omitted.
I believe ICs are limited by how fast you can cool them. All that energy goes into heat eventually, so temperature is going to depend only on total energy / area
Digression: Is it true that every single watt my CPU/server/electronics consume is ultimately turned into heat? To put it another way, does a server under a constant 500W produce the exact same amount of heat as a dumb 500W electric space heater? Excluding things like the tiny amount of energy that gets sent out on CAT5 cables, which I believe still gets turned into heat just elsewhere. I think this is true, but it’s…
> something more useful...
Ha! A space heater with bitcoin mining coils. Call them "bitcoils".
Re: This website has 81% battery power remaining
#239Earlier quoted context omitted.
I believe ICs are limited by how fast you can cool them. All that energy goes into heat eventually, so temperature is going to depend only on total energy / area
Digression: Is it true that every single watt my CPU/server/electronics consume is ultimately turned into heat? To put it another way, does a server under a constant 500W produce the exact same amount of heat as a dumb 500W electric space heater? Excluding things like the tiny amount of energy that gets sent out on CAT5 cables, which I believe still gets turned into heat just elsewhere. I think this is true, but it’s…
In short, yes. Exactly (well minus a few used to spin fans and hard drives). Here's one source from a quick search:
https://www.pugetsystems.com/labs/articles/Gaming-PC-vs-Spac...
I remember seeing a paper referenced here once explaining why that energy loss is actually necessary, but I don't seem to have it saved anymore.
Re: This website has 81% battery power remaining
#240It’s a like a deja vu, this website. It’s been linked repeatedly, for years, having the same kind of discussion on HN over and over
I had a similar deja vu because just few days ago I posted a comment asking similar tech: > Other than raspberry pi, does anyone know of an even lower powered board which can run a very simply web server (only needs to return a single html file)? I have an idea for a fun hobby project where I want to connect my echo bike (for cardio) to the board which charges it everyday and returns an html with how much I charged i…
I ran a webserver of sorts on an STM32F767, a python one of all things.
200mA looks like about par for the course, ethernet and all.