Questions tagged [electricity]

Questions concerning the production or use of electricity in a sustainable way.

9
votes
2answers
161 views

How worthwhile is it to use energy during daylight to take advantage of grid-based solar power?

Common sense is telling me to try to do things like vacuuming, laundry and cooking at times of maximal sunlight during the day so that more of the electricity I use comes from solar power generators ...
7
votes
3answers
1k views

What Makes an Oven Eco-Friendly?

I am currently in the market for ovens and I wanted to know what makes on oven eco-friendly, whether it's electric or steam, without compromising reliability. I want a oven that not only benefits me ...
12
votes
1answer
6k views

Which types of spare electric motors from common consumer appliances are suitable to repurpose as generators?

I've heard that washing machine motors (in particular, the Fisher & Paykel branded ones which are local to me in New Zealand) are quite suitable for repurposing for generation use. Other types ...
5
votes
2answers
213 views

Is there a portable water recycling unit?

Is there a portable water recycling unit that one could install in their studio apartment to recycle grey water ? Or which is the smallest grey water recycling unit ? And can't someone just pass the ...
7
votes
1answer
179 views

How efficient is it to use an electric car as storage for the energetic overload generated during sun hours (peaks) by solar panels?

I guess that the question is quite self-explanatory. I am hoping to invest in a solar panel soon, but I am a little worried about it getting inefficient once government subsidies run out and the ...
5
votes
3answers
133 views

Resources for Teaching Children About Solar Panels

I'm sure some of you will have already taken classes on Solar. The reason I am posting this question is to help out two Farmers in Kauai, Hawaii. They are currently creating an extension program ...
20
votes
2answers
799 views

Should I keep laptop and cellphone batteries fully charged, let them die before charging, or something in between?

Generally, is it better to let laptop and cellphone batteries fully die before recharging, to leave them plugged in constantly even when charged and not in use, or to unplug them once they are fully ...
25
votes
5answers
14k views

What types of plugged in electronics use energy even when turned off?

I just need some convincing before I start unplugging everything. I kind of assumed that USB type computer, phone, or printer chargers would use electricity. And obviously my computer, sound system, ...
5
votes
1answer
122 views

Central or Micro inverter

I want to install some solar panels around 1 kWp. All the suppliers nearby offers me a central inverter solution. Should I look for a micro inverter solution? Or is something that I shouldn't bother?
2
votes
1answer
365 views

Repair a bedside lamp

My beloved bedside lamp fell down, on the carpet so it wasn't a big hit, and it stopped working. Now, I tried to replace the bulb, but it doesn't change anything. Since this had happened to me ...
6
votes
2answers
4k views

How much power does an Electric Airpot use while on standby?

We have just brought a Buffalo K711 4.25L Electric Airpot that is great for my wife as she is disabled and can find a kettle hard to pour. I was expecting it to be well insulated, however its sides ...
1
vote
2answers
468 views

Can an enclosed Pelton Turbine be used as a pump?

Can an enclosed Pelton Turbine be used as a pump, perhaps through the centrifugal forces created in a enclosed Pelton Turbine when it rotates at speed? The water striking out of the buckets of a ...
7
votes
2answers
978 views

How to save heating energy with roommates?

I live with roommates, and am only a renter not owner. I'm looking for ways to help with energy conservation despite this. We have one roommate who is wasteful about leaving lights on and, in ...
9
votes
2answers
138 views

How can electricity grids successfully incorporate high (50%+) penetrations of PV and wind?

Although most of the renewable energy currently consumed by the world can be turned on and off at will pretty easily (hydro and biomass), there are two potentially huge supplies, wind and PV, that are ...
14
votes
3answers
10k views

How to build a waterfall powered electric generator?

Want to build one of those old-style water wheels powered by a waterfall. Is there a more efficient way than the ones that were around since the start of the industrial revolution?
5
votes
3answers
55k views

How many kilowatt hours of electricity does it take to heat 180 litres of water from 15 to 60 degrees C?

I think this calculation uses the specific heat capacity for water, which is from memory a bit over 4. Can someone please do the math? Also, if we assume electricity costs $0.30 per kilowatt hour, ...
12
votes
4answers
316 views

Water heating / electricity production by using earth's warmth?

I'm very curious, why hasn't anyone done this? In most places on earth, the temperature gets 25 degrees higher (celsius) for every kilometer in depth. How hard would it be to drill 4-5km, put a U-...
7
votes
1answer
2k views

Washing on delicate or permanent press…is this more sustainable and also gets your clothes clean?

Is it more sustainable to do your wash using the delicate or permanent press modes? I can tell from observing the different kind of washes is that the machine spins less and spins more gently. If so, ...
4
votes
1answer
129 views

I'm in England, and want to move to a time-of-use electricity tariff, how do I get an appropriate meter fitted?

I'm in England, and currently on a single-price electricity tariff, that's measured by a (very) old-style electricity meter (mine says "property of Eastern Electricity Board" on it, so it's well over ...
31
votes
3answers
2k views

Which solar power technology has the highest energy return on investment (EROI aka EROEI)?

Which solar-electric technology had the highest EROEI? Energy Returned On (Energy) Invested, also known as EROI and as EROEI, has become something of a fashionable metric *but see footnote. It is ...
3
votes
1answer
123 views

What are the biggest supply-side logistical constraints on the expansion of offshore wind?

Offshore wind is a booming industry, and in particular the UK has an enormous theoretical potential to generate 2TW mean power from offshore wind, as I wrote on my blog. And whereas there's a lot of ...
10
votes
2answers
2k views

How much energy does it take to create a single light bulb?

This question is a part of this question. Perhaps it is better suited on the physics SE, but here goes. I would like to know how much energy it takes, in the modern world, to construct an ordinary, ...
22
votes
4answers
779 views

What form of electrical lighting has the smallest energy-footprint?

We all know that when it comes to household electrical lighting, LED lights consume the least amount of energy for a given amount of light, followed by fluorescent tubes, halogens, and Edison-age ...
12
votes
2answers
3k views

Are there any viable DIY or commercial solutions to convert waste heat to electricity?

Apparantly there are some advances in converting heat to electricity such as here or here. But are there any commercial solutions/devices/DIY projects or is this at the moment (as stated in the ...
23
votes
10answers
765 views

How can I manage my fridge's contents better?

Sadly, about 30-50% of the Western world's food is thrown away. Personally, I waste about half of my food, due to poor fridge management. I forget what I have bought and find expired food located in ...
22
votes
2answers
175 views

Do “100% renewable” electricity plans increase renewable electricity production?

In the advertising for this year's earth hour in Sydney, Australia, it encourages people to switch from conventional electricity to renewable energy. A number of electricity providers offer "100% ...
33
votes
3answers
3k views

Are electric cars as environmentally friendly as we think they are?

Given the fact that the average lifetime for a car battery is 3 years and all of the batteries end up at a landfill at the end of their lifetime, how sustainable are electric cars in providing a ...
5
votes
2answers
429 views

How to monitor energy use in existing office building without submetering?

Our office occupies one floor of a 4-story hundred year old building. We are making tenant improvements to our space, and are interested in lowering and monitoring our energy use, but are unable to ...
19
votes
8answers
2k views

What is an easy way to cool off during the summer without electricity?

What are some easy ways to stay cool during the day without using electricity?
-1
votes
1answer
142 views

Can I measure the average electricity consumption of a specific website design? [closed]

It is said that websites with a black background are more sustainable from an electricity consumption perspective. Is there a tool to measure the most sustainable website design you can use while ...
34
votes
2answers
575 views

What’s the best strategy for turning off CFLs that will save energy but not reduce lifespan so much

With ordinary bulbs, I was used to turning the lights off even when I left the room for a few minutes (mostly because I know that I'll find other business and forget to return :-) ), but I've heard ...
16
votes
3answers
6k views

Would monocrystalline or polycrystalline solar panels perform best in a UK climate?

If I were to get solar panels installed on the roof of my home, in the UK, what type should I choose? There appear to be three main types, and at present the choice appears to be between the ...
42
votes
6answers
837 views

Producing my own energy options in urban area with windows but no roof access?

I'm wanting to produce my own energy, but I live in a condo with no access to the roof. I'd like to produce electricity, so maybe turning that energy into electricity safely. I have windows that have ...