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Solar and batteries can power the world

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Re: Solar and batteries can power the world

#101

Post by kogasa240p »

panick21_ wrote: post #16

Nuclear could have powered the world easily and we could have done it with 1960s technology. And we could easily do electricity and heating with nuclear quite easily. The only thing that's actually tricky is synfuels and solar/battery doesn't solve that. High temperature reactors using heat to create hydrogen is arguable the better path to synfuels then electrolysis. And we can go to 100% of electricity from nuclear,…

> The only thing that's actually tricky is synfuels and solar/battery doesn't solve that. High temperature reactors using heat to create hydrogen is arguable the better path to synfuels then electrolysis.

Found this interesting: https://phys.org/news/2026-02-microbial-eco-friendly-butanol.

Re: Solar and batteries can power the world

#103

Post by DanTheManPR »

declan_roberts wrote: post #5

The article is just wrong. And only mentions energy used for heating in passing. Heating requires MASSIVE amounts of energy. I should know bc I have a whole house battery and solar system (almost 30 kWh battery and 24kW solar). It keeps the lights on, but not heating. I live in a mild climate. The reality is that battery/solar requires major quality of life and activity time shifting trade-offs.

This is basically correct in the sense that we cannot simply just force everyone in, say, Minnesota to install electric baseboard heating, rooftop solar, and a battery pack, and then expect them to stay warm. There are periods of extended extreme cold and low solar flux where you would simply not be able to warm everyone's house - that's just physics.

But there are a lot of extra things you can do as an intermediate steps to dramatically close the gap. The main ones are:

1. Homes can be renovated to improve insulation 2. Cold weather heat pumps can handle most mild winter conditions efficiently 3. Electricity doesn't all have to be locally generated - it can be transmitted from other parts of the country. 4. You can keep using fossil fuel peaker plants, and still have incredible reduced overall emissions

Re: Solar and batteries can power the world

#104

Post by Windchaser »

lstodd wrote: post #35
iamjake648 wrote: post #10

Earlier quoted context omitted.

Do you have a high efficiency heat pump, or how are you heating?

First question should be: what latitude? Because where I live around 55th this winter we had five straight weeks below -15c / 5f daily average plus enough snowfall that it was infeasible to clean anything but the most major roads. Solar is out of question in these conditions and when thermal pump fails you have to evacuate. When just grid electricity fails you have to either have some sort of stored fuel backup or ev…

> The article is typical handwavy crap which is popular among people living in what amounts to subtropics

To be fair, 90% of the population lives within 45 degrees of the equator. If we're talking about global energy solutions for CO2 reduction, we can go a long way just by focusing on what works in these areas of the globe.

The article does also point out that hydro/wind are going to be important at higher latitudes in winter, but they also acknowledge that they don't account for seasonal variation in demand. That's the biggest flaw I can find in the analysis.

FWIW: I'm down in a mild arid climate at 35N, and yeah, 90% of our winter days are nearly sunny, even when the lows are in the teens. It's a different world for sure.

Re: Solar and batteries can power the world

#105

Post by toasty228 »

arrowsmith wrote: post #63
toasty228 wrote: post #39

Earlier quoted context omitted.

People still build houses like energy is cheap and abundant. A properly insulated house in any temperate climate require very little heating or cooling. Spend 50k on insulation that will last the life of the building instead of 50k on heating and cooling devices which will need constant maintenance and replacement + fuel and end up costing 10x more over the life of the building. A modern house with modern insulation…

Why shouldn't energy be cheap and abundant?

Not saying it shouldn't, I'm just saying it isn't. Housing should be free and taxes illegal but here we are. Some retard decides to go to war with Iran and it costs 30% more to tank your car, I'm not making the rules. Solar panels got 15% more expensive over night in my country too. What happens when they decide to mess around with China? They make 70% of batteries and panels.

Re: Solar and batteries can power the world

#106

Post by a_random_name »

toasty228 wrote: post #69
JKCalhoun wrote: post #52

Earlier quoted context omitted.

And never mind ground-source heat pumps [1] (although I know the topic was specifically solar). [1] https://en.wikipedia.org/wiki/Ground_source_heat_pump

You don't even need to go that far, put 100m of tubing 2m underground and plug it in your heat recovery ventilation system, bam free winter freeze protection/pre warming and free summer cooling, all you need is a 30w pumps and you will save hundreds of kw per year

uh no... You still need a heat pump. The water coming from that system would be like 50 degrees, far too cold for heating.

Re: Solar and batteries can power the world

#107

Post by j23n »

jwr wrote: post #49

No, they can't, not unless we get rid of the fossil fuel lobby, which pretty much runs the world these days. Which isn't surprising, given that fossil fuels are the largest industry ever created by mankind. If you compare it to anything else which was actively harmful and yet big money tried to convince you it wasn't (like tobacco, alcohol, or really anything else), there is nothing that huge. So it isn't surprising…

I think this sells the German energy mix short - fossil fuel has been on a steady decline in the energy mix for about 2 decades now.

Comparing 2020[^2] to 2025[^1]:

- renewables (solar+wind) went from 181 TWh to 219 TWh

- fossil (coal+gas) stayed constant (177 TWh and 179 TWh)

So I'd say we switched from nuclear (60TWh in 2020) to renewables & imported nuclear - but the long-term trend is towards renewables.

[1]: https://www.ise.fraunhofer.de/en/press-media/press-releases/... [2]: (pdf) https://www.ise.fraunhofer.de/content/dam/ise/en/documents/N...

Re: Solar and batteries can power the world

#108

Post by Retric »

germandiago wrote: post #92
anon7000 wrote: post #61

Earlier quoted context omitted.

Yeah, the technology connections video on this was fantastic. If one was to cover that land in solar, you’d produce far more than the current energy demands of the US. Relying on an energy source which requires constant, continuous resource extraction is fucking stupid when we can spend resources up front and get reliable energy (solar + battery) for decades with minimal operating cost & maintenance. And then we’ll h…

So here I go: if it is so stupid, why it is not done yet? Try not to blame anyone. Do it rationally if you can, from your message I understand your opinion. I say this as a person that has lived in a developing country the last 15 years. It is not that simple IMHO...

The economics only changed recently and infrastructure lasts a long time. It’s the same reason EV’s make up a far larger share of new car sales than a percentage of overall cars, EV’s sucked 20+ years ago yet there are a lot of 20+ year old cars on the road.

The US stopped building coal power plants over a decade ago but we still have a lot of them. Meanwhile we’ve mostly been building solar, which eventually means we’ll have a mostly solar grid but that’s still decades away.

Re: Solar and batteries can power the world

#109

Post by chongli »

AndreyK1984 wrote: post #54

What about STORING excess power and delivering it during the day at a same level ? That is a critical part! I remember last time it was too expensive.

Because solar energy production doesn't just vary by time-of-day, it also varies seasonally. Where I live, winter solar production collapses due to decreased daylight hours and cloud cover. At the same time, energy use skyrockets due to heating demand.

We would need a lot of batteries to be able to charge during the summer and drain during the winter!

Re: Solar and batteries can power the world

#110

Post by jdc0589 »

I wish it made sense to do residential solar where I am. It probably does technically, but i hate the idea of spending a ton on a system and then STILL have to pay my power company; if you are connected to the grid at all where I am, you pay the power company $5/kw/month of solar capacity and your excess sell-back rates are insanely bad (0.03/kwh, vs billed usage rate at $0.17/kwh)
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