Questions tagged [battery-storage]

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How to (theoretically) capture 59 megajoules of power in 5 seconds to store like a battery for a month? [closed]

On Dec 21, 2021 EUROfusion Scientists in Culham, UK produced 59 megajoules in 5 sustained seconds from their nuclear fusion experiment. What theoretically would be required to capture that energy and ...
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1 answer
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Can Lithium-Iron-Phosphate or LiFePO4 batteries be stored in cold?

According to this site, you can store in -40°C/-40°F just never charge them below freezing. I have a E-Bike in cold Canada and taking the battery out is a pain. The link says just make sure it's ...
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2 answers
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Car Battery Voltage

Why is the voltage of a car battery rated for say 12V around 14V when the car is running? Is it because of the alternator?
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battery bank mixing and draw

I have a few questions regarding battery packs. Is it OK to mix 2 sets of old batteries together, ie 2 are 75Ah and other 2 are 70Ah, they all came out of a mobility scooter and weren't getting the ...
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1 vote
4 answers
2k views

Why are lithium-ion batteries stored at 50% voltage and not a lower voltage?

I understand that a higher voltage causes more degradation of the material in the cell, but I'm curious as to why the typical storage voltage is not lower than 50%. I've always assumed that the lower ...
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3 answers
630 views

MW versus MWh is one total capacity and the other maximum output?

I still don't completely understand MW versus MWh, I have been working on a Wikipedia article for Tesla's "megapack" battery which are measured in both. I assumed one was an indication of how much ...
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Battery (e.g, LA, SLA, L-ion) usage recommendation

For the same Capacity requirement, which of the below options is better? 1. Single battery with full capacity (AH) 2. Multiple battery (in parallel) with total same capacity (same AH). For example, ...
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2 votes
2 answers
105 views

Emergency Shutdown

I am designing a system that is always on. It is powered via POE and it is doing some task that is not mission critical. The system has an embedded system inside that runs Linux. The storage etc are ...
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Theoretical rechargeable battery capacity question

I have very little energy usage/storage knowledge but my question will hopefully prove to be a simple one. If I have a 120 volt appliance that uses roughly 0.50 kWh a day and 600 watts at peak draw, ...
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9 votes
6 answers
3k views

Why don't we think about battery storage for all sources of electricity on a utility scale instead of just renewables? [duplicate]

One of the repeating solutions that comes up when talking about renewable energy power generation and the intermittency of it is battery power storage. This has got me thinking, it takes hours or ...
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Charge AGM battery from car alternator

What is the most efficient way of charging an AGM battery using a car alternator? I have a 12V plug connected to alligator clips which can be used in the 12V sockets inside the vehicle. Is this the ...
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Can I store lawnmower Li-Ion batteries in cold storage during the winter? [closed]

I purchased a Li-Ion battery powered lawnmower. I'm not entirely sure what the actual exact battery chemistry is, but I believe it is not lithium iron phosphate due to its voltage typical of non-...
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6 votes
2 answers
644 views

Stair like discharge voltage profile in AGM battery

please help: I have a string of 14 AGM batteries in series, when discharged at constant current, the voltage has a stair-like shape with respect to time. What does this mean? The batteries are new ...
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2 votes
2 answers
100 views

How to calculate battery ratings for your solar panel?

If I want to choose a battery for my solar panel which is required to run a load of 5 kWh/day. Then I will be needing a battery with a rating of above 23 ampere hours since 5 kWh/220 V (since 220 V we ...
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1 vote
1 answer
629 views

Guide for piezo charging?

İ am currently working on a smart shoe( Dont ask why...) and I am using a 3.7 V 300 mAh li po battery with no drop out during transmissin. But the battery life doesnt last as long as I need it to be. ...
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2 answers
66 views

Rechargeable Lead Acid Charging [duplicate]

I am planning on using a rechargeable lead acid battery for my tennis ball pitching machine. Is it feasible to hook them up to motors and run the motors until the battery is empty, and then come home ...
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3 answers
842 views

Conversion of 11,200 MWh to a XX MW facility [closed]

How large of a battery storage facility (in MW) would be needed to supply 11,200 MWh of electricity for 4 hours before becoming completely discharged. The facility would be comprised of lithium ion ...
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4 votes
1 answer
2k views

Long term storage of sealed lead acid battery

I was given some brand new sealed lead acid batteries. I have no real need for them right now, but I don't want them to go to waste. I'm trying to figure out the best way to store them, unloaded, for ...
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