this post was submitted on 01 Jan 2024
42 points (76.9% liked)
Technology
59559 readers
3514 users here now
This is a most excellent place for technology news and articles.
Our Rules
- Follow the lemmy.world rules.
- Only tech related content.
- Be excellent to each another!
- Mod approved content bots can post up to 10 articles per day.
- Threads asking for personal tech support may be deleted.
- Politics threads may be removed.
- No memes allowed as posts, OK to post as comments.
- Only approved bots from the list below, to ask if your bot can be added please contact us.
- Check for duplicates before posting, duplicates may be removed
Approved Bots
founded 1 year ago
MODERATORS
you are viewing a single comment's thread
view the rest of the comments
view the rest of the comments
My immediate thought about that item was almost the reverse: They should do it for electric kettles in the US! Imagine having half a gallon of boiling water in like 30 seconds instead of 5 minutes or whatever it is now (and then the kettle would charge for a few hours, but still be able to heat at the normal wall outlet rate in the meantime)
Assuming regular cold tap water as starting point (that's ~10°C for me) you'd need a power output of something like 50kW to heat a gallon (3.8L) of water to boiling in 30sec, assuming a 98% efficiency.
Ah, I was just making up numbers, but since those car jump start battery packs claim to have hundreds of amps (I saw one with 1,000 in a quick search) at 12V, and this will be like a bunch of those, if those numbers are real it should be totally feasible for it to dump the energy fast enough.
Since you brought it up, I might as well check the other numbers.
Doing the 30 seconds multiplication for the half gallon I mentioned (my kettle only holds 1.7 l = .37 gal anyway), that's 208.3 Wh, which for a typical lithium 3.6V nominal voltage would be 58Ah, a lot of battery, but not unrealistic - I'm holding a power tool battery (Stihl AK30) which is 180 Wh (50 Ah)
Over the course of those 30 seconds it could also pull 12.5 Wh from the wall to slightly reduce the needed battery size.