TV powered on 9 volt batteries? Is DC a off-grid solution for modern appliances?#ElectronicsCreators

TV powered on 9 volt batteries? Is DC a off-grid solution for modern appliances?#ElectronicsCreators

I’ve always wanted to know if modern appliances could run off of DC directly. I know that transformers don’t work on DC, but modern appliances use switch mode power supplies. SMPS convert the incoming mains from AC to “hi voltage” DC. So it’s possible to feed them DC directly, as it passes straight through the bridge rectifier inside.
Everything from phone chargers to TVs, and even LED bulbs (but not all of them), compact fluorescents, all have switch-mode power supplies inside. and could run perfectly well on DC.

I thought it would be interesting to string a whole bunch of 9 volt batteries together, and see if they could power mains appliances.

#ElectronicsCreators

10 Comments

  1. ARNOOKIE VR on January 18, 2022 at 2:53 pm

    This is fantastic. Would it work the same using 24v lead acid batteries in series?
    I really want to try this with my solar setup. Would love to get rid of the inverter.

  2. Walter Messines on January 18, 2022 at 2:55 pm

    Check with electrical engineers. DC to AC is done mainly to avoid thick DC wires afaik, which on a small solar setup won’t be too much of an issue anyway. Avoiding the inverter is a dream come true for anyone electro-sensitive. It’s the worst part of the solar system for those people. Charging a phone with 120V DC is … well. It can be charged from USB 5v? , so why bother to use the charger?

  3. Edward Fletcher on January 18, 2022 at 2:58 pm

    This is fascinating !
    Thanks for doing this,

  4. Edward Fletcher on January 18, 2022 at 3:01 pm

    Would it damage my fridge to test it ?

  5. Carel Hauptfleisch on January 18, 2022 at 3:11 pm

    Maar my magtag, dis pretty spif

  6. Sparky Projects on January 18, 2022 at 3:13 pm

    Not a surprise, as you clearly show in the diagram, a smps is basically an inverter
    A friend of mine tried powering a PC power supply from as low as possible, he got it down to about 20 volts reliably, though he only had a light load on the output.
    Many electronic devices use SMPS and often list a wide range of voltages, just like the dell psu.
    Some cheap phone chargers or led mains lamps use a series capacitor, so those won’t work either.

  7. Dianne Smith on January 18, 2022 at 3:20 pm

    I was thinking of using rechargable 9v to charge my 48v scooter and recharging the 9v by solar. Any suggestions

  8. majormajor333 on January 18, 2022 at 3:20 pm

    Wow, I wouldn’t have guessed the 9v batteries would supply enough current. How long did the battery pack last?

  9. and Chips on January 18, 2022 at 3:40 pm

    Nice experiment, I was wondering how far you could reduce the DC voltage down and the appliance would still work.

  10. ruhoer eoijre on January 18, 2022 at 3:43 pm

    I have a 120/240v IGBT (microcontroller controlled)welder and I was been really scratching my head if it will work on dc, since it’s 7kw and inverters on 7kw is not particularly cheap) I think I will try it thru a fuse.

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