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Joined 1 year ago
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Cake day: June 12th, 2023

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  • government regulation to force companies to begin using a modular system

    Yeah, that’s fair. But the issue is also similar to cell phones.

    Each battery is unique because it needs to fit the unique layout of the vehicle. Not to mention the battery tech is moving so fast, that the chemistry of the battery itself is changing every few years.

    I suspect China’s approach to a vehicle where you hot-swap the batteries instead of charging will be the way it goes. Someone will do it, it will be most $$$ efficient and therefore profitable, and then it will force them all to adopt the same approach.


  • The replacing the battery is simply a supply issue.

    There is such a demand and so little supply, that if you want to buy just a battery (and not the entire car) you are out of luck. They’ll put that battery in a new car and sell it before selling it to you as a replacement.

    But that’s short term. There are a huge number of battery plants already breaking ground and coming online.

    In 2 years or so, the price to replace the battery will be a HELL of a lot lower, and the issue you linked above will be long gone.



  • Stuff with motors are, like air con and refrigerators. Those are better left on AC.

    No. Trend is they are all showing up with frequency drives. Of which those inverters are rectifying to DC before making their own AC.
    Efficiency gains are massive of a frequency drive , hence why they are doing it.
    Would be even better if they could drop the first rectifying circuit and just use the inverter portion only.

    You lose very little by rectifying AC

    You lose a lot actually in all the small cheap rectifiers that are in every device in the house.

    Where a single purpose designed FET rectifier that is built for efficiency at the breaker would be drastically better.











  • _ I don’t think USB C PD could handle a hairdryer though_

    Of course it wouldn’t. The idea would be get rid of USB-C and PD completely.

    You’d have 110VDC@15A available for your hairdryer. Heating coils don’t care if it’s AC or DC, and the blower fan would be a brushless fan.

    You’re compressors for AC or fridge would be freq drives, which are cheaper because they could drop the rectifier circuit, and highly efficient.

    The only real concern about having DC in the home as standard is the safety aspect of DC doesn’t let go if you get shocked.

    But that is already being worked on in general as many homes have high-voltage DC circuits from solar panels.


  • No, it’s got nothing to do with power over ethernet.

    It’s simply having only one high power rectifier at the breaker box.

    And removing all those rectifiers from every device in the house.

    We don’t need AC in the home anymore. Every device is now using DC, and any other device will still work with DC.
    The only thing really left are motors, but even those are going brushless and we can chop half of the inverter out of the equation of those as well.

    And every device won’t even need smart electronics for PD either.

    It would also solve the North America 60Hz and EU 50Hz issue, where the AC coming in doesn’t matter. We all standardize on a DC output.

    And when people want to add alternative power (Solar/Wind/etc), it’s a HELL of a lot easier to just push the DC into the existing system without having to worry about frequency matching.