Ancestors

Written by Manawyrm | Sarah on 2024-09-01 at 21:22

New blog post:

Executing Linux applications on a Raspberry Pi in less than 3.5s from power-up! 🚀🏎️

(and other power saving tricks)

https://kittenlabs.de/blog/2024/09/01/extreme-pi-boot-optimization/

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Written by Z̈oé ⛵ on 2024-09-02 at 07:57

@manawyrm elsewhere I don’t think I’ve seen much use of watt-seconds as unit (it’s J)

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Written by Manawyrm | Sarah on 2024-09-02 at 07:59

@uint8_t I must admit, my brain can deal with Ws, Wh, mA, mAs, mAh much better than mC and J (even though those are technically more correct, I guess)

But that's just personal preference after all :)

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Written by Z̈oé ⛵ on 2024-09-02 at 08:00

@manawyrm watt is joules per second, so watt-second is joules per second-second

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Written by Manawyrm | Sarah on 2024-09-02 at 08:00

@uint8_t be thankful I don't start using pirate-ninjas :P

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Written by sebastian on 2024-09-02 at 09:43

@manawyrm @uint8_t So 1J = 0,000239006 kcal. A 500ml bottle of clubmate has 20 kcal (according to $random foodwebsite). So 1J = 83679.908 club mate bottles energy equivalence units.

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Toot

Written by Manawyrm | Sarah on 2024-09-02 at 09:45

@sebastian @uint8_t that doesn't sound quite right.

500ml Club Mate has 585 kJ of energy.

For comparison, a single 18650 with 3000mAh has about 40 kJ.

Are you volunteering to pedal a bike (while fed only Club Mate) on that mountain in winter days to recharge my battery? 😹

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Descendants

Written by sebastian on 2024-09-02 at 10:06

@manawyrm @uint8_t

Yeah sorry I'm stupid (a bottle of mate might have prevented that one...)

https://www.foodrepo.org/en/products/1741

The photo says: 20 kcal or 84kJ.

I got my division wrong.

1 club mate bottles energy equivalence units = 83679.908J ~ 84kJ

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Written by Z̈oé ⛵ on 2024-09-02 at 13:03

@sebastian @manawyrm It’s 84kJ / 100ml so 420 kJ total

(you should really get a mate)

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Written by Manawyrm | Sarah on 2024-09-02 at 13:10

@uint8_t @sebastian haha, this means Club Mate and modern 18650 have the same energy density by weight :)

500ml Mate -> 420kJ

10x 18650 (at 48g each) -> 416kJ

Fun :)

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