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I built an open-source, AI-powered solar panel that's 95% optimal

jackogrady.me

131–140 of 143 posts

Re: I built an open-source, AI-powered solar panel that's 95% optimal

#131
post #31

Earlier quoted context omitted.

I raise you a wax motor: https://www.youtube.com/watch?v=MiADday0mDA https://en.wikipedia.org/wiki/Wax_motor tl;dr - sun rises, temperature rises, wax material expands, motor actuates, solar panel tracks the sky as if it was a sun flower. Maybe the gloop is sentient or something.

Variation in temperature between days (summer vs winter) is larger then variation between morning and afternoon.

And? I was going to type out a reply but got me curios whether this is a solved thing already.

It is a thing already: http://www.sulasindustries.com/technology/

Re: I built an open-source, AI-powered solar panel that's 95% optimal

#132

Earlier quoted context omitted.

the US is a metric country that's in denial

The US is a country that just does the engineering and doesn't constantly whine when they see a unit they don't like.

Reminds me of a bug in a certain laptop docking firmware that considers TjMax of 95F (instead of 95C) and running the CPU at full throttle mode (like 400MHz) at all times.

Re: I built an open-source, AI-powered solar panel that's 95% optimal

#133
post #83

Earlier quoted context omitted.

As I understand, the limits regulate the total capacity of the installation not the actual amount of electricity produced.

That would be very peculiar. Unusual, anyway. Do you know anyplace that does it? Whose business is it what your total collection area is?

Oregon limits residential customers to 25 kW (nameplate capacity).

https://oregon.public.law/rules/oar_860-039-0010

From the cursory look it seems like most states have limits like those. A lot of them are generous enough so you don't have to worry about it. But there are some states where covering an entire roof of a moderately sized building would put your over the limit.

https://www.ncsl.org/research/energy/net-metering-policy-ove...

Re: I built an open-source, AI-powered solar panel that's 95% optimal

#134
post #117
post #116

Earlier quoted context omitted.

Thermal for heating/hot shower or thermal for some adventure in driving a generator? For heating, photovoltaics supplying a heat pump is starting to give direct thermal a run for the money (well, not actually for the money yet, direct thermal is still cheaper, but at least in terms of how much you could harvest from a given roof area) If money isn't an objection at all, e.g. if you strive for that sense of achievemen…

This idea was a flat "panel" of parabolic reflectors focused on heat exchanger tubes, driving a heat engine. The new bit was that the heat engine was going to be open loop (basically Brayton cycle with the compression stroke pushing air into the heat exchanger and expansion stroke driven by heated air from the exchanger) so its power density would have been much higher and cost lower than the usual Stirling cycle eng…

There are hybrid solution of panels that are basically layering a PV over a Thermal Panel (pipes with fluid inside). I never saw them getting massive traction. I wondered why.

Some example: https://www.convertenergy.co.uk https://dualsun.com/

Re: I built an open-source, AI-powered solar panel that's 95% optimal

#135
I manage a solar micro grid that powers 9 Holmes, a small farm, and several other structures and utilities.

We use intelligent power management over the fiber network to tell certain loads when to turn on or off or to change their operating parameters based on power conditions.

I’ve been daydreaming about building a ml based forecaster that just gives the next few hours weather outlook based on pressure, temperature, humidity, and a wide Nigel image of the sky.

I know it is doable because I can do it myself, and probably without any intuition about the pressure. It would automatically calibrate the model wights by feedback from the actual events vs the forecast. This would be really useful for me at least, in managing battery usage and otherwise managing the various systems that store energy like air compressors and large mass refrigeration.

Re: I built an open-source, AI-powered solar panel that's 95% optimal

#136
post #135

I manage a solar micro grid that powers 9 Holmes, a small farm, and several other structures and utilities. We use intelligent power management over the fiber network to tell certain loads when to turn on or off or to change their operating parameters based on power conditions. I’ve been daydreaming about building a ml based forecaster that just gives the next few hours weather outlook based on pressure, temperature,…

This sounds interesting, whereabouts?

Re: I built an open-source, AI-powered solar panel that's 95% optimal

#137

Earlier quoted context omitted.

Very fascinating story. What's your opinion on the Lightyear partially solar powered up oming commercial car?

This is the first I've heard of it. The physics of it seems fine. The engineering is going to be very hard for them to get right. Just skimming their web site, range is qualified as "WLTP drive cycle". I assume that means software enforced torque and speed limits, and no one is going to want to drive with that enabled. Using 4 independent motors implies they're using in-hub motors. They don't seem to mention a top sp…

Thanks. I would assume you could make the front and rear electric motors optimized for different speeds. That would mean power loss towards top end speeds.

Re: I built an open-source, AI-powered solar panel that's 95% optimal

#138
post #88

Earlier quoted context omitted.

No evaluation then.

Comments are speaking to it like it wasn't even addressed. Do you need data to understand that moving a cell out of a shadow would increase its capacity?

If that's the core proposition, yes, I want data on it. If that data is obvious and boring, then so is the proposition.

Besides, the panel can't move, only rotate and tilt. Have you actually read the article? (With rotate and tilt only, pointing directly at the sun should maximize the power output from a single panel even with shade from other objects. You can get a very small amount of movement from the fact that the point of rotation is outside of the plane of the panel. But that's not mentioned at all, is it?)

In any case, if you solve a problem with machine learning that already has a non-machine learning solution, you will get this kind of comment. If on top of that you don't compare the existing solution and yours and show that yours significantly improves performance, it just looks like doing ML for the kicks.

Re: I built an open-source, AI-powered solar panel that's 95% optimal

#139

Earlier quoted context omitted.

This is the first I've heard of it. The physics of it seems fine. The engineering is going to be very hard for them to get right. Just skimming their web site, range is qualified as "WLTP drive cycle". I assume that means software enforced torque and speed limits, and no one is going to want to drive with that enabled. Using 4 independent motors implies they're using in-hub motors. They don't seem to mention a top sp…

Thanks. I would assume you could make the front and rear electric motors optimized for different speeds. That would mean power loss towards top end speeds.

Maybe, but I would be surprised if they did that. From a manufacturing point of view, having two different motor types is more expensive.

More importantly, the motor drive electronics would have to be designed specifically to support that. A motor's top speed is limited by the supply voltage because a spinning motor generates its own voltage called back-EMF. When back-EMF matches the supply voltage, the motor drive can't push any current through the motor because there's not enough of a voltage difference. When the motor spins even faster than that, its back-EMF exceeds the supply voltage. This does something funny to the motor drive. The voltage across the FETs in its H-Bridge circuit swaps polarity and the FETs become "reverse biased". A reverse biased FET acts like a diode, and allows current to flow through it. As a result, the motor generates a braking torque. The only way for a motor drive to avoid that would be to have an additional semiconductor in series with the H-Bridge circuit. That would make the drive more expensive, and lower efficiency. It could be done, but I doubt it.

It's also hard to optimize a motor to work well at low speeds, but then have it be efficient at high speeds, even if not using it. One of the ways motors lose efficiency are in what are called "eddy current losses". Just the fact that the motor is spinning means that metal is moving through alternating magnetic fields, and that induces eddy currents in the metal. Those Eddy currents generate a braking torque, and heat up the metal.

This all assumes the motors are permanent magnet brushless motors. I think that's a safe assumption since they are in-hub. There are other types of motors, such as induction, that work differently and don't have the same "speed limit" or Eddy current losses when freewheeling. Most electric vehicles use one or two induction motors. They aren't in-hub, though, because they don't scale down in size well.

Re: I built an open-source, AI-powered solar panel that's 95% optimal

#140

Earlier quoted context omitted.

the US is a metric country that's in denial

The US is a country that just does the engineering and doesn't constantly whine when they see a unit they don't like.

it only loses us a billion dollar spacecraft once in a while
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