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Questions tagged [energy-storage]

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0
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0answers
27 views

Can a Tesla Powerwall 2 be rate limited?

Can a telsa powerwall 2 be rate limited (discharge/charge)? I have access to realtime electricity rates (30 min update interval) and also access to 12 hour predicted look ahead. So I wish to limit ...
3
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0answers
16 views

clockwork motor output in joules formula

I'm trying to understand the output of clockwork coils in joules or watts for different coils. You know the pullback car or windup pocket watch mechanism. I have heard it also called power in the ...
1
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1answer
61 views

Li-ion batteries storage

I am going to store used li-ion batteries for some long time >1 year, and I have read that optimal storage conditions are: cool ambient temperatures, like 2-5 ...
2
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1answer
99 views

How do generators in space transmit/ deposit energy back to Earth? [closed]

I've read about the idea of putting solar panels in space, or the already used electrodynamic tethers which gain energy as they move through Earth's magnetic field. The question I have is: How do ...
-1
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1answer
29 views

Why do pumped storage hydroelectric facilities use bent pipes? [closed]

When a reservoir is used to store water for electricity, it's pipes are usually laid in several segments on the ground to reach its source, such as a lake. It seems that if the pipes went directly to ...
1
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0answers
44 views

Batteries for electric airplanes [closed]

I'm interested in the development of electric small airplanes with 4 or 6 seats, that could really happen in the following decades. One of the main problems related to this project would be the ...
0
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2answers
94 views

How do you use an insulation jacket's R-value for calculating heat transfer from a hot water tank?

I know how to use thermal resistance circuits to calculate heat transfer in Cartesian and cylindrical coordinates, but I don't know how to deal with real-world insulation values, and I was not able to ...
-1
votes
1answer
39 views

What tools to use for a solar powered backup? [closed]

Recently, we experienced complete outages for around 8 hours, due to construction on a nearby road. We have decided to install a backup battery and solar array to prevent this from happening in the ...
-1
votes
1answer
76 views

Do commercial fuel cells actually exist or it is just hype?

I keep reading about how great the energy density is for hypothetical fuel cells, but as far as I can tell these objects do not exist in any practical form outside of laboratory prototypes and "...
6
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2answers
1k views

Why does compressed air energy storage use intercoolers?

Why do CAES systems have intercoolers after every compression stage? Isn't it a waste of work, since the air will cool anyway in the storage cavern?
1
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2answers
49 views

Compatibility Of CAES [closed]

I would like to know with which existing types of power plants(thermal,wind,etc.) can compressed air energy storage(CAES) be used efficiently? And how can it aid power plants like thermal(a brief ...
3
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6answers
2k views

Working hours of power plant generators

My question might seem a simple one, but it has been troubling me for a while. How many hours in a day do conventional electrical generators work (the ones in large power plants)? Do they by any ...
1
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1answer
115 views

Energy density of “heat storage ceramic” vs. NMC li-ion batteries

I was intrigued to read about so-called "heat storage ceramic" and was wondering how the energy stored in such way compares to energy stored in a NMC Li-Ion battery, if the latter is used to generate ...
3
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2answers
310 views

Pneumatic Actuators - System Reversibility. Is it possible to use an actuator to store energy?

I'm very much new to pneumatics and I was wondering if there was such a thing as a reversible pneumatic actuator? I'm designing a system that has to be lightweight, pneumatic and use a mechanical ...
1
vote
2answers
434 views

Can large capacitors allow power plants to run at full load and store excess electricity?

We know that demand for electricity is not constant. Power plants are not operated under full load conditions. What if power plants were operated under full load condition and excess electricity was ...
6
votes
2answers
881 views

Can the Sabatier reaction power a vehicle?

The Sabatier reaction converts CO2 to methane. Can a vehicle that burns methane recover it (at least some part) from the exhaust gases via the Sabatier reaction? I am interested to know how this would ...
8
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2answers
1k views

Air compressor that doubles as a pneumatic motor?

I am working on a compressed air energy storage system. The size and weight of the system are heavily constrained; nothing should (ideally) exceed a few pounds. For this reason, I would like to store ...
6
votes
5answers
7k views

Is compressed air energy storage economically viable in the home?

If I install a small air compressor/engine, generator, and tank in my garage, and I charge it up at night when electricity costs $\frac{5.4p}{kWh}$ and use it during the day to power my house when ...
13
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1answer
626 views

What causes rechargeable batteries to age? What can be done to extend life of these batteries?

These days most of modern electronics use rechargeable batteries as a power source. Also, these days most modern rechargeable batteries are Lithium Ion or Lithium Polymer based. Like any other devices,...