Batteries aren't the only way to store energy. Here's another.

Publisert 20. juli. 2021
"Reduce emissions and save the grid with this one weird trick!!!"

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  • Hey! I realized that I pretty much only talked about the residential side of things and left some of the tactics commercial buildings use until the very end. Well, here’s me now saying that this is by no means something we can’t apply wherever it would work. In fact, many commercial buildings are doing pre-cooling already when it makes sense for them. None of the ideas presented here are new, exactly. But I do think there’s a lot of potential here specifically when it comes to getting use out of renewables. “Make hay while the sun is shining” is a perfect expression, here. In some areas we’re already running into issues where there’s so much solar capacity that we can’t use it all. Rather than wait until we have more electrochemical batteries at our disposal, perhaps we can use all this thermal mass we have. The key thing about insulation is that it slows the transfer of heat. That means it buys you time. The challenge of renewables has always been that the time of production doesn’t match the time of consumption, but with more intelligent control and awareness of a building’s thermal capacity, ability to pre-heat and pre-cool, and the tolerances of its occupants we have a pretty flexible tool for shifting consumption right now.

    • In London, in the Summer, I open windows 5am to 8am, cool house down, and keep windows closed during the day, easy manual AC :) I have been thinking of building a house, for the last 10 years, with large water storage on the roof, and storage in the basement. Just pump water during the night, economy 7 (half price), and use water turbine to generate electricity as needed, during the day :)))

    • @Daniel Phillips surface area of tanks scale inversely to volume. Volume increases cubically for example while surface area of a cube squares to edge right? The squared becomes diminimous to the cubed as scales increase. Storage efficiency is easy to rule out as deal breaker. Only politics of the corrupt sort prevent distribution of mantle heat energy by phase change material you pay nothing to start for nor to discard. Delta temp also increases value of material. Radiant cooling becomes EVEN MORE COMPELLING. WITH SCALE PIPELINE LOSSES OF ENERGY REPRESENT COOLING TO THAT PROXIMATE TYPICALLY WELCOME! REMEMBER THE PIVOT! THE INSULATING PIPE SUPPORTS DID NOT MELT THE PERMAFROST. THE USE OF THE PETROLEUM'S EXTERNALITIES WAS KNOWN AT TIME BY PIPELINE BUILDER TO DOOM PERMAFROST. FOR THIS REASON THEY ARE LIABLE FOR COST OF REFREEZING LOST ICEBERGS FOR DE ACIDIFICATION OF OCEAN AND YES CONTINENTAL WIDE RESTORATION OF PERMAFROST. SUCH A PIVOT WAS CONSUMATELY CRIMINAL REPRESENTATION.

    • Fiscal benefits aside, how do you think this will scale as an energy solution? Given the thermal losses are a function of delta T, there’s certainly a cost to the storage- have you calculated that?

    • @brayoungful burning hydrogen is nonsense. Platinum turns it 'chemically" to heat far better. Also avoiding electricity's costs on locomotive gets you regen braking. You condense more nitro to stop over MANY miles or downhill with in stock sku'd GE TURBINE AND REST OF RIG. ZERO EMISSION PLUS HIGHLY EFFICIENT REGEN YET WE WASTE BILLION'S CURRENTLY ON MORE DIESEL ELECTRIC ABSURDISM FROM SAME INSANELY CORRUPT G.E. FOR HOW MANY MORE YEARS! CALL YOUR CONGRESS. DEMAND LIQUID NITROGEN RETROFITS OF ALL TRAIN INFRASTRUCTURE.

    • Great "opinion piece"! As for an idea of Turning knowledge into power(storage), look into actual technology options that are available to the customer, (make it a sponsored piece, for good measure). Commercial success fuels growth and this stuff cannot come on line soon enough!

  • Those energy prices man.. In germany ist like 10x this per kWh

  • You... you need to become an HVAC technician. You need to. You owe the industry that much. You understand it better than most of my peers.

  • I do a similar thing at night in the Pacific NW: Windows open all night and box fans on, driving cool air in and hot air out, as soon as the temp drops below ambient indoor temperature. Fans off/windows closed at 8 AM. This means that most summer days, the A/C set at 74 doesn't kick on until the day is almost over, if at all. Caveat: basement and main level are super comfy, but the upper story bedroom is uncomfortably warm at 6 PM (as high as 86 during the insane heatwave we had earlier this summer).

  • "... the biggest consumer of power in this house is the fridge. And the dehumidifier. Oh yeah, and the freaking incandescent heat bulb driving the lava lamp behind me."

  • I'd want to be your neighbour. I don't want to live in the US, but I'd want to be your neighbour. I'd totally share heat storage, cold storage, sun storage, night storage, e-cars, whatever underutilised yet stunningly obvious energy management solution with you.

  • Thermal mass + insulation rulz ... also an earth house is nice protected against heat

  • There's a better way to do it, old school. No AC whatsoever. Shut windowblinds in the morning. Open wide during the night. For extreme needs, use a fan. For even more extreme needs, hang a wet towel in front of it. How to keep your house temp semi constant for 40 watts.

  • Another bonus to make you happier about your technique - Lower outside air temperature lowers your AC head pressure, increasing pumping efficiency due to lower differential pressures. For fun, try running your AC at 80 ambient vs 60 ambient and check your compressor amp draw.

  • The night-cooling method is what I'm doing all summer. It can be 36 C outside but I manage to keep my house below 24 C, which I would already consider too hot (at this moment, perfect 22 C). I will never need an AC.

  • Hmm, I'm kind of leery of using IoT devices in...okay, maybe a thermostat in particular isn't exactly a life critical device or much of a privacy/security liability, but still a smart home is not my cup of tea. However this is a very appealing concept otherwise. Do you think there is a way for utilities companies to achieve this without requiring the customer to have an IoT thermostat?

  • I work at a church that was built in 1950, when of course air conditioner units were not a norm (for the Pacific Northwest). In the winter, we have no problem keeping warm because of the heater unit, but in the summer the building can get unbearably hot. In the structure of the building the roof peaks up to a ridge, and and so in the evenings we turn on the exhaust fan in order to pull the hot air out of the building. In the mornings and early afternoons the room still keeps at a reasonable temperature. In the concrete sealed basement the temperature never gets above 65, so we also will start circulating the air and it helps bring the temperature down as well.

  • Technology Connections: *This Video* Electric Company: Write that down, write that down!

  • Me sweating in front of my gaming PC after I immersively let it run my 300w space heater equivalent GPU render a pretend plane crossing the Atlantic in real time overnight: "Hmm, I should totally try this"

  • 66 degrees at night doesn't seem cold at all to me?

  • Insulation is a one-time cost, but so many homes (at least in the US) are constructed like they are made of cardboard. If you live in a hot, humid, and sunny area, your AC could be running for most of the day. The walls and windows let in way too much heat from outside and your AC is just constantly trying to pump it back out. Excellent insulation will solve most of these issues and it's much better for cost and for the environment, too.

  • Super cool (😏) video. Thanks for the idea.

  • Hydroelectricity ay............that just might work < from 1882

  • As a Brit, please can I say thank you for making the effort with the Imperial/metric conversions!

  • What is ironic about this, is that if everyone switches to overcooling at night, then the energy demands will go up at night and this entire idea gets turned on it's head.

    • Except no, because one, it's "its head", not "it's head". And two, although significant, AC isn't the only spike load generated by people just being back home from work.

  • I am very jelous of your electricity prices. It's literally 5x as much here. :(

  • Good insulation and a good basement do wonders for energy efficient temperature regulation, even better if you have a second story. Just move the air. Convection is your friend.

  • The duck curve is BS. If we built solar (& wind) farms all across the country, we’d have peak power thruout the middle of the day. We just need more transmission lines as well.

  • Is it ironic that this regulation depends on the load changing during the day? I mean, if everyone was only using electricity when it was cheapest, it would no longer be cheapest at that time

  • This is sort of like the difference between me driving manually and my car doing it by itself. I know that I should accelerate a tiny bit at the bottom of the hill to compensate for loss of energy going up, rather than floor it just before the top of the hill and flying over the top to land somewhere on the other side. Exaggerated for effect, but that's what it feels like. Put in a few km/h early, lose about double that climbing a hill, and get back to speed after saves a lot of fuel. So much, in fact, that it's easy to see from the average consumption which person has been driving in our household.

  • This is the concept behind the Earthship building design’s passive heating used in the American Southwest and traditional homes in the Middle East and Northern Africa.

  • Just want to clarify a misconception. The black out that occurred in Texas was due to 3/4 of the nuclear plants shutting down as well as all renewable sources. The issue was NOT caused by load side. Exacerbated? Yes, but certainly not the root cause.

  • Quality drywall work at 16:15 lol

  • Damn your electric power prices are very low. In Germany you have to pay over 30 € Cent for a kw/h. That's almost $ 40 Cents.

  • Yesterday I was watching a NOwiner who creates massive battery packs. Usually these things are associated with solar power. But... What if you set one of these up to charge at night, and discharge during the day. Maybe even sell back to the grid during the day. (I also live in Texas) Sounds like a fun project and way to game the system. Some cost/benefit of the battery packs is required. Your system is nice in that you don't need any hardware.

  • Utility control sounds practical, but also a privacy nightmare. (thermostats changing is one thing, it's a slippery slope) I think Passive House is the answer - superinsulated homes that never get cold and require very little energy to heat and cool.

  • Just adjusted my cooling schedule accordingly

  • If you have good insulation, a heatpump system and a small battery this would work soooo smooth

  • Why aren't more roofs white? Seriously, with sunlight being up to 1100 watts per square meter, why would anybody make the roofs black? In places like the south, it could literally cut your electric bill in half in the summer to just paint your roof white.

  • This even works in Phoenix. 25 year old 100% electric house, with new low e windows. I set the a/c to 70 after 8pm & before 3pm the next day. Then turn the a/c off from 3-8. Highest it’s ever gotten inside is 80 right before 8pm when a/c turns on again. I also put the hot water heater on a timer to turn off during this time & there is still enough hot water for 2 showers. We also don’t use the oven on weekdays instead plan stovetop/grill/crockpot/instant pot meals. I’ve been doing this for over 2 years now, and my average bill went from $250 down to $150. I’ll take it!

  • meteorologists don't have the next day figured out at all on a very local level. they can't even predict with 100 % accuracy if it'll rain in your location in the next 30 minutes.

  • 6 Cents per kW/h - or as we say in Europe: are you f…ing kidding me?!

  • not cooling your house? what a shockingly innovative idea.

  • I'm sleeping at around 16 °C, 19 is uncomfortably warm for sleeping IMHO.

  • Alternatively if many people use do such thermostats it could be synchronized so that only half the ac units are on at any given time but they are still consistently on throughout the day

  • **Dad Bursts into the power plant** Which one of you apes touched my thermostat?!

  • 16:47 wtf is that

  • SIX CENTS per kWh? Wow, you really be burning cheap stuff. In Germany, you are lucky to get 25 Euro cents/kWh (about 31 US Dollar cents)

  • When my house didn't have A/C I would put a box fan in my window at night and blow the air into my room from the outside to cool it down. When morning came I would take the fan out and close the window. Worked like a charm!

  • Am I the only one who thinks solving a energy surplus problem (it's too hot) by adding more energy (running an AC) is counter intuitive?

  • Should check out "The Edge" office house in the Netherlands, it's a pretty awesome futuristic building which is energy neutral on a yearly basis, pumps hot water down into the cellar in the summer to be used as heating in the winter.

  • my kWh goes for +28 cents ;(

  • The contrast between Europe (in this case Germany) is so crazy, we almost dont have ACs here. Like we really don't have them but we do the same thing, opening the windows in the night to let cool air in and closing blinds during the day to keep the heat out. We do have different houses tho but it still buffles me to see the effort one puts into this

  • The power providers need to fix the Problem, Its a supply and demand problem. I pay for service they Need to Fix there Problems, Its not my Fault they can't out put the power that is needed. Fix your shit. And don't charge me for your problems. Its not my Problem it is there Problem. the Power providers can piss off . Its not my fault you can not Provided the needed Power. Its your Problem Fix it. I am paying For Service. All this energy star rated stuff and led light bulb's really Helped what a fucking joke. we never had problems when we were running incandescent light bulbs and vaccum tube CRT tv's that all used a few 100's of watts.

  • I'd like to see smart refrigerators use the pre-cooling trick. Maybe lock the door during peak demand hours too LOL.

  • One of the simplest ways to use less energy during hot weather is to take on the naturist lifestyle and stop wearing unnecessary insulation. As long as I've had a house I never needed to use, or even install, an air conditioner, because with no clothing I stayed cool naturally. The most I ever needed was a fan. If the house gets especially warm, putting a box fan in an upstairs window to force hot air out and bring in cooler air downstairs quickly cools the house without using much wattage. Naturism also greatly reduces the amount of laundry generated, as well. My family and friends who don't follow the clothes-free way of life run their A/C all day long.

  • I live in Alaska, no heat from end of march tell middle of september. We have heating oil and wood stove.

  • Interesting. I always thought that power outages were always a failure in the system. I didn't know it was sometimes the energy company shutting it off in my area to save the grid. It makes sense but I never knew

  • This information is what some may consider useless, but at the same time incredibly helpful in understanding the fundamentals of our society. Amazing stuff!

  • I think you just saved me a couple hundred on my electric bill... Thank you!

  • 4:25 damn that scene reminded me of a San Andreas mission

  • Thanks! You just made me regret buying a smart thermostat!

  • but if people must absolutely (and ignorantly) run about a *_dozen_* high-power appliances at the same time in the early evening on hot summer days, then they deserve to have their power interrupted... because in this current instant gratification society, they must have clean dishes, clean clothes, clean house, fresh coffee, a warm meal, and a freezing house *_NOW!!!_* instead of an hour or so apart from each other

  • What about the side effects of an increased CO₂-concentration and air pollutants from furniture etc. in the air? I basically do the same in my home but simply with opening the Windows during the cooler night times. But, it has it downsides of significant lower air qualty during the day.

  • We don't even use air conditioning here in Europe. Lol :D

  • You may have mentioned this in another video but I can't see to find it: What thermostat do you use at home?

  • @ Technology Connections: Regarding the images used at 4:04 and 4:11 You added "Credit: , Wikimedia Commons" for both of them. Both files are licenced under the GNU Free Documentation License (GFDL) and the Creative Commons Attribution 3.0 Unported and Attribution-Share Alike 3.0 Unported (CC-BY-3.0 CC-BY-SA-3.0). In order to use the file under the terms of the GFDL you would have to include the full licence text with every copy of the image (which makes it pretty much unusable for this case) and the CC-BY-3.0 as well as BY-SA-3.0 licence requires that the licence is attributed as well (section 4a of the licences legal code). For CC-BY(-SA)-3.0 Section 7a clearly says that the rights granted by the licence "will terminate automatically" if the restrictions are not followed. So, in short, your usage of these image are a violation of copyright licence. Adding the information to the video description is not enough since the video can be shared without it's description. My point here is not to make you delete the video or something like that. It's more to educate and point out how the licence should actually be used (a surprisingly large amount of people don't know how to use CC licenced content). I have been working for ~14 years with CC licences and also have contributed ~1000 files to Wikimedia Commons. I already did find so many of them not being used according to the licence terms. I don't share the files to make money, but to give people a chance to see and use images they may not have the time or option to take. And all I asked for is to follow a few simple rules that the licence sets out.

  • Heat batteries.

  • My SO calls yo Professor Proton and we would either be best friends or Arch Nemesis.

  • The problem is tying it to the ability to do lockouts. People will sign up for an energy cost saving technology that lets them save money by letting the company pre-load like you're discussing, but we do not trust our power companies with the ability to lock us out of control over our own homes. The reason for this fear should be pretty obvious when you look at where the rolling blackouts seem to occur. It's fairly frequent that we see these things occurring on the news with a poor to middle class area out of power for days while the business district and wealthy neighborhoods are shown with the power still on. We don't trust companies to be equitable in the use of this. We can easily see a scenario where they announce that everyone "has power" while locking out the AC/heating and appliances of a wide swath of the population for weeks because it's not profitable to deal with the problem and it's a nuanced problem that the media hates to cover. A system could be devised to make it work, but I think your gamification coupled with voluntary automation options and a "clever way to save money" style education program would be a better tactic to get adoption of this. That would, however, need to be coupled with upper limits on pricing. The problem you mentioned in Texas with variable rate costs was that some people got hit with intolerably high rates unexpectedly. It could be managed either by a rate percentage cap, or by setting the base rate high and making every modification of it be some form of "discount" off that base rate. People in the US are fundamentally averse to giving up power to corporations, governments or other collective bodies because we have a long history of that yielded power being abused. All good solutions for a US market are going to need to keep that in mind and keep control as democratized as possible without relying on the old ideas that don't work in reality like "voting with your wallet" when there's only one power company in town, or "petitioning" an organization that represents far too many people for you to viably reach out to for signatures.

  • Running AC at night would also be more efficient in general too wouldn't it? With lower temps outside it would be easier for the condenser to reject heat.

  • With geothermal you can save energy in the ground over seasons.

  • You can reduce your refrigeration costs in Chicago by durring the winter freezing water in containers all winter long. Mix salt in some of the water to freeze and thaw at a colder temp. Make sure it is cold enough to freeze the water for the freezer compartment.

  • Just turn my attic into a Stirling engine already!

  • Excellent video as usual! You should contact Linus (of NOwine channel "Linus Tech Tips" with 13.7 million subscribers) because he is doing a new build house, with winding pipes under the floors of all this rooms, and his 13.7 million subscribers would be very interested in your insights on heat pumps rather than conventional heating and separate air conditioning. I sent him the following message: You could easily modify your current heating & cooling solution to be far cheaper to run (about one 4th the price in power costs for heating and cooling using gas or electricity), more environmentally friendly, and in an all in one solution. Simply extend the pipes already under your floorboards to long tubes buried deep outside and put a ground source "heat pump" in-between (which works in a similar way that a fridge pump sucks the air out of an already cold fridge and pumps all the heat into already warmer air outside the fridge). When its cold weather, the heat pump can extract heat from the pipes buried outside (no matter how cold it is) and use it to heat the house by heating the pipes under your floors by using pressure to extract that heat before pumping even colder fluid outside to heat up again. And it can do the reverse when you want the house cooling; it can suck the heat out of the under floor tubing (so they are well below freezing point and act like a refrigerate to cool your rooms by sucking out the heat) and dump that heat outside underground (no matter how hot it is on the surface outside). This would do away with the need for a seperate inefficient air conditioner, which works a bit like a heat pump stuck one way so it only sucks heat out of the house and blows it outside, and is less efficient anyway because the difference between the air temperature outside and the air inside is closer than that underground outside and the air inside. Have a look on the NOwine channel "Technology Connections", he has done several videos on heat pumps like "The Future of Heat Pumps is Underground (and other places, too!)". Good luck on a techie environmentally friendly and cheaper to run all-in-one heating and cooling system. :)

  • Rolling blackouts are 3rd World, mate.

  • i love this channel dude, that’s it that’s the comment

  • My wife just unsubed and ORDERED me to follow her party line... She hates cold! I'm not sure I like her anymore...

  • I'd love to hear your take on underground houses, in terms of power saving and possible "battery" viability.

  • I live in the place with the most expensive electricity in the world. the usual rate is around $0.36 - $0.40AUD per KWhr :( the only way for a cheaper bill here is solar, which we have.

  • as someone in the pacific northwest, my building already has thermal-mass based air conditioning: apparently incorporating a lot of unpainted concrete into the design aesthetic means they can get away with no electric AC and achieve Leed Platinum

    • We in the PNW are blessed when it comes to temperatures. My fam lived in Portland from 1996-2010 without A/C and it rarely was a problem. Still in Portland, but nowadays A/C is important a number of days each year. So not as blessed as it used to be.

  • A box of bricks simple but inelegant? Simplicity is elegance.

  • Seems inelegant and inefficient to heat and cool a 10,000 - 20,000 cubic foot home when you only need to regulate the temperature immediately around you of less than 50 cubic feet. I enjoy a space heater in the winter if I’m just sitting around in one place. It keeps the temp around me 10 - 20 degrees warmer than the whole house. So I’m using less energy but also LOSING less energy to the outside environment. The temperature gradient (one object giving off heat to another object) is linear and proportional to the temperature difference (delta T in the formula). So if you double the difference in temp between the inside and outside of your house, you double your heat loss which is bad for the pocket book and environment. I wonder about other options for people that really want to be efficient in using their hvac. I’ve heard that in battle tanks, they can’t regulate the temp because of all of the ports so the soldiers wear vests that can heat and cool them comfortably regardless of the outside temp. I wonder how well that would work for peoples’ homes (or how inconvenient it’d be). Also, how about an AC version of a space heater such as having a small portable AC with a hose that just blows cool air on you if you’re sitting in one place for long periods like working on a computer, watching tv, or sleeping. This could allow your house or work to be 20 degrees warmer with possibly great savings to you and the environment - and you’d still be comfortable. These ideas are a little outta the box thinking for homes and offices but I wonder how outta the box people will go if energy crises continue to rise. Also, the skin is a very inefficient way to transfer heat compared to your lungs. The alveoli have massive surface area with your blood. This is why people that fall through ice and suck up a lung full of cold water do better. It immediately cools the whole body. Next time you’re cold, take a few breaths near the warm air of a hair dryer. It’ll heat you up in a few seconds. So breathing a very small stream of warm or cool air directly is a very quick and efficient way to heat up or cool down and uses much less energy than going through the skin. How this applies is instead of someone being uncomfortably hot because the AC won’t turn on because of a deal with the power company, then they can have a small AC run at 10% the power with cool air blowing directly on them and they’ll be very comfortable. This works if they’re not continually roaming about the house. I have no specialized knowledge in these matters - just thinking out loud...or typing out loud...or whatever.

  • eeehh I'd rather not give control over my household to a corp.

  • For a while we tried a time of use rate, but it just wasn't saving enough money to be worth the hassle. It isn't that we didn't try -- through the techniques you outlined, we basically moved almost all our demand to the off-peak rates. However, in our part of the country, the difference between peak and off peak was -- and is -- only 2 cents. On the electricity, we were saving about $5/month, but the utility had a higher monthly charge for the TOU rates that wiped it out completely.

  • 01:28 the UI responsiveness hurts my eyes

  • The UK Economy 7 storage heaters had a bad reputation. The early 1970s models were ugly and bulky and with very crude controls - just a thermostat for the brick temperature and a manually adjustable vent, with no timed or thermostatic control of the energy release. Relying on the user to predict the heating needs of the next day. Giving maximum heat in the early morning and decaying throughout the day. Coupled with our poorly insulated houses of the time. And they were still significantly more expensive than gas fired systems. Of course modern ones are significantly more sophisticated but still work out more expensive than gas on our current tariffs.

  • 16:50 What Alex said: "One particular issue with this is called the Duck Curve." My brain: something something THERE'S A GUY IN A FLIPPIN EXO-SUIT WHAAAAAT?!?🤯 and now graphs. What's the heck is the Duck Curve about?

  • That's not what energy storage is. That's just demand management. No amount of overcooling one house can provide power during peaks for the neighbours.

  • I can concisely shorten the message in the video. Power supply weak and NOT growing. Therefore consumers must cut back on usage. If you do not power grid will do it for you. Oh and those electric cars, they use up a lot of the grid too so get rerady to not charge them. Yay the earth is saved.

  • I get free power from 8pm - 6am. Live in Texas. Decided to give his approach a shot. AC Managed to cool house to 65f by 6am at which point the set point is moved to 75. It was already 75 inside by 10am lol. I have some serious insulation/leak issues going on. Need to buy a thermal camera to figure out wtf is going on.

  • Oh yeah freeze you ⚾️⚾️ off at 5am screw that companies have to much power as it is!

  • Beautiful Idea! It will be challenging though to convince the average american household to accept the fact that they will lose this tiny bit of control. Thinking rather satirically, they would often prefer to guard their thermostat with a gun. So…. implementing it via gouvernment regulations? But then again, the fear, the guns…

  • I dislike the idea of the energy company directly changing the thermostat, but I wouldn't mind having a free (as in freely accessible at no cost) api that says "hey we're in risk of shortage from this time to this time" and my thermostat regulating itself with some incentives for not overloading the grid.

  • I have been super cooling my house on off hours for years. The electric company also rewards me via lower rates because I try to use so little electricity between the hours of 5pm-7pm in the Summer which are on-peak hours. It is called Time of Use Program. I also avoid generating cooking heat (and odors) by having a second microwave, toaster oven and induction plate in a mini-kitchen area of the attached garage. Lastly is water heater management. I turn the breaker on for that for about 30-55 minutes before a shower. Then I turn it off before the shower. There is almost no wasted heated water left in the water pipes and what warm water is left I will do a load of laundry with when needed. ps---dont forget you really don't need to use artificial lighting in the day---go with filtered natural light. You can use LEDs at night or charge up solar lights outside during the day and bring them in at night.

  • Living in the tropics it's oddly not very easily thought of here to have perfectly insulated buildings, if anything there tends to be a thing with having openable windows and all. Might be cool if we can come up with a solution that works here too where it's hot all the time, heatwaves are already less of a problem since that's what you don't get if it's always hot to begin with, but saving the energy consumption would be nice given solar should be a lot more attractive here than elsewhere on Earth, yet it's not happening.

  • In summer I crank down to 58 degrees (hvac tech installed a special stat for this) and hvac will run maybe 4 times a day for 30 minutes Got to love Tennessee power my utility is rarely over 200 for water and everything plus living on a slab I have a giant cold sink from the ground to assist (spray foam for ceiling is coming in 3 months) Your battery idea wouldn’t work as well in the southern Midwest 97 a lot of days but it helps

  • Something similar was done in Germany in the 1970s. Nuclear power plants and coal-fired power plants cannot be switched on and off quickly. The electricity load is high during the day and low at night or on Sundays. There were special electric night storage heaters. These are resistances that are embedded in heavy, heat-retaining stones. During the night, a sound signal is modulated on the normal mains frequency, which switches the double electricity meter to the low tariff. The storage stoves are heated to the preset temperature and give off this heat for 24 hours. There is no need to install a combustion heater. But the temperature can only be adjusted 24 hours in advance. This was also particularly elegant for historic church buildings, where the electric heaters can be hidden under the benches. But rising electricity prices and a constant price have made this model unprofitable. Electricity is only really cheap for large electricity-intensive companies with individually negotiated contracts. Perhaps such methods will come back when there is a lot of wind energy available to charge e-cars, for example.

  • You mentioned you will be going to heat pumps. Be aware that some consume electricity 24/7 to heat the compressor fluid to prevent it from condensing and causing damage during start up. My Mitsubishi Hyper Heat outdoor units consume about 250 W each (I have 2) 24/7 regardless of the outdoor temperature. So my plan to cool down or heat up my house during the day when I am producing solar power is only marginally successful because of this constant load. I discovered this when I installed an Emporia energy monitoring system. I do not know if other heat pump vendors do the same thing and no where in Mitsubishi's literature is this mentioned.

  • ARR FARG! You just made me look up 'Wall-insulation' - I live in the Sub-tropics where traditionally we haven't had any wall insulation - and even Ceilings was recent [ I have R3.0 batts - is that any good?] - but Summer is murder. Brick / Thermal-mass is worse than useless in such a climate 04:00AM 27Deg-Celsius. Mass = useless. Reflectivity and Insulation = Good. [ I will research, SUMMER IS COMING! ]

  • Two thumbs up for the outtakes. My log house has the same R value as a 3.5" stud framed home. But the thermal storage creates a four-hour delay in temperature changes. Got it. It really reduces my energy consumption in the spring and fall. I'm embarrassed, as an engineer, that I didn't think of charging my battery myself. Thank you. I'm heading to the thermostat right now to charge my house battery for the day. Not for energy savings, but to keep my wife cool this afternoon. 😉

  • Here in Germany we have to pay at least 28ct/kwh

  • 'has a lot of potential' - I see what you did there

  • So when I was a kid back in 70s mom used to do basically the same thing. Except we did not have air-conditioning. What she did was at night open all the windows and doors to let in the cooler night air, then in the morning before it got too hot she'd close all the windows and close all the curtains to keep the sun out. This kept the house from getting too hot in the afternoon. Not perfect, but kept it bearable in the hot, humid, Ohio summers we used to have.

  • I have a Public Service 16mm film from 1976 that explains the ACES house. Annual Cycle Energy Storage system. A large water tank in the basement is cooled by a heat pump drawing heat from the water to heat the house in the winter. The water is frozen into ice. Then, in the summer, the ice is used by the heat pump to cool the house. Initial cost is pretty steep, but the overall energy savings are substantial. And this technology is 45 years old!