All Questions
57
questions
0
votes
1
answer
31
views
Lithium polymer battery size versus energy density
I am building a small device that needs to use a rechargeable lithium polymer battery. The dimensions I am looking for are 351125 { 35 mm (H) x 11 mm (W) x 25 mm (L) }, which is the standard way these ...
1
vote
2
answers
88
views
Energy density vs voltage battery
I find on this website the following sentence:
It is said that higher voltage battery have higher energy density. But it appears to me not so evident:
If I consider the 2 following batteries:
If I ...
- 2,478
13
votes
5
answers
4k
views
Why do capacitors have less energy density than batteries?
The basic operating principle of a battery is, in order to charge it, the electrons are removed from cathode and moved to anode by applying voltage. And to discharge, the electrons move from cathode ...
- 249
2
votes
2
answers
93
views
Power and energy of pumped hydro versus grid scale batteries
A company is proposing a pumped hydro system where they state on their website as “capable of producing up to 335 MW of electricity with around 8 hours storage”.
The same company is proposing a ...
- 21
-3
votes
1
answer
96
views
Alternatives for batteries for energy storage [closed]
If it is not the indicated Stack App, let me know, please. I don't really know if this topic is about chemical stuff because of batteries composition or just a electronic energy problem.
I've been ...
0
votes
1
answer
127
views
Mismatched rating in Ah and Wh. Why is that?
My question concerns the apparent mismatch between the Wh rating and the Ah rating often found on batteries.
On one of my batteries the label says:
12V Leisure Battery TR350 TUDOR EXIDE DUAL 80Ah, ...
- 11
0
votes
2
answers
2k
views
Battery capacity and parallel vs. series battery connections
Say you have 4 200 Ah 12 V batteries connected in parallel, this as I’ve come to learn increases the amp-hour value and not the voltage, and say you have another system same as that but connected is ...
- 3
0
votes
1
answer
164
views
How to calculate watt hours gained charging battery?
I need an estimate of how many watt hours a battery has gained after charging to a certain number of volts.
With a 12 V, 50 Ah lead-acid car battery, charged from 12.5 V to 13.0 V, is it as simple as ...
- 11
1
vote
1
answer
439
views
How to measure energy usage from a 12V battery over a daily pump cycle
I am working on a project right now where two different DC water pumps are being powered by a single 12V DC battery. I am trying to do some performance testing to find how much energy from the battery ...
- 11
11
votes
6
answers
2k
views
Why is the energy in a battery QV, but the energy in a capacitor QV/2
If I know the total charge in a battery, let's say 5000 Ah, and I want to find how much energy is stored in the battery, I multiply the total charge by the voltage E = Q·V; for example, for 12 V I ...
- 153
0
votes
0
answers
28
views
Programming - battery energy logging; creating negative and positive data output from a single sensor
I'm using a single bidirectional Hall effect sensor to read the current coming to and out of a battery, but an application requires 2 separate sensors; one for incoming and 2nd one for outgoing energy....
- 157
0
votes
1
answer
130
views
How to find mAh rating of battery for my project?
I am using a NodeMCU ESP8266 for my project.
The datasheet says it consumes 170 mA in active mode, and approximately 10 milliamperes in sleep mode.
In my project, the NodeMCU runs 1 minute in active ...
0
votes
0
answers
194
views
Battery cost LCOE and carbon emission by hourly. Validation of calculation approach
I am compiling a report and trying to validate my understanding of using power correctly to multiply with constants like price and emission in kg weight. Please point out if the approach below is ...
- 101
3
votes
1
answer
245
views
Is there a linear relationship between energy production and global horizontal irradiance?
I'm an apprentice in data science. I am currently working in a company that produces and installs energy storage systems. One of the clients of this company wants to estimate the loss due to the ...
- 33
-3
votes
2
answers
125
views
What depletes batteries
I recently learned how how energy actually flows in batteries, the electric and magnetic fields create an energy vector pointing into the circuit at all points and out of the battery. This broke my ...
