I don’t know… you didn’t mention your uncle once…
Comment on This was the first result on Google
Naz@sh.itjust.works 10 months ago
Hello, expert solarpunk here.
**TLDR: Car battery is 350Wh. Fridge uses 143W idle, so it’ll run a fridge for 2-3 hours. **
Explanation below:
Car batteries are lead-acid (sulphuric acid and lead plates).
They discharge according to Peukert’s Law as the negatively charged plate gets covered in lead via the acid (electrolyte).
As the battery depletes, the negative plate can begin to take permanent damage, and so you can’t discharge a lead-acid deeper than 10-20%, or about 10.8V, with the safe limit being ~50% discharge.
Most 12V, 60Ah batteries therefore only safely store and nominally discharge 350 Wh @ 350W.
You can discharge that as fast as you want but the faster you discharge, the lower the capacity is (with 1000-1500W bringing you way down to like 65 Wh). Fridges have a surge when they start up to fire up the compressor. Starter batteries can take that, but once the refrigerant is cold, the fridge just maintains the temperature which uses a lot less energy - about 143W on average.
EdibleFriend@lemmy.world 10 months ago
Seasoned_Greetings@lemm.ee 10 months ago
That’s because he is his uncle. You’re seeing the source material, be amazed
MrBusiness@lemmy.zip 10 months ago
EdibleFriend@lemmy.world 10 months ago
Does… Does he work at PlayStation?
Seasoned_Greetings@lemm.ee 10 months ago
It’s a secret. You’ll have to ask his uncle
alilbee@lemmy.world 10 months ago
Wow, those are some serious Licensed Insurance Agent skills
Aux@lemmy.world 10 months ago
You have a very inefficient fridge! My fridge is rated for 272 kWh per annum, which is 745 Wh per day or 24 Wh per hour. You need to buy a new fridge.
drathvedro@lemm.ee 10 months ago
Fridge uses 143W idle
The only thing running in idle is the timer and power led, which consume insignificant amounts of power. By my calculations, the average modern fridge does bursts of ~300W during compression and defrosting cycles, with ~40-50W consumption on average over long periods.
HeckGazer@programming.dev 10 months ago
You did not answer their question. They asked for Watts, not Watt hours. Average car batteries have a CCA in the range of 500 to 1000 Amps at 12V, so you could reasonably have 12kW in there :D
baru@lemmy.world 10 months ago
Isn’t that like 1250 kWh on an annual basis of idle usage? An efficient fridge should use 150-200 kWh per year, this isn’t just idle usage. Even an inefficient fridge would be really high with that kind of idle usage.
genie@lemmy.world 10 months ago
Also assumes that the average fridge runs on 12V 😂
JohnEdwa@sopuli.xyz 10 months ago
Watt hours are watt hours. Sure the compressor won’t run on 12 volts as is but the energy is there, just needs a converter.
piecat@lemmy.world 10 months ago
That’s a big joule thief
genie@lemmy.world 10 months ago
Sure, buy an inverter and burn up 10% of your energy in the conversion if you’re lucky. That inverter will cost roughly as much as the contents of a standard fridge + freezer, by the way :)
At that point just buy a well insulated cooler and always have some ice on hand. It’ll last much longer.
suodrazah@lemmy.world 10 months ago
Energy is energy, you are confidently incorrect.
genie@lemmy.world 10 months ago
Congratulations, this is the worst attempt at ridicule I’ve ever seen