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Arduino functions, solar panels, inverter, smart meter and the case for 3.6kW
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By Julian

Youtuber, shed dweller, solar charge controller aficionado

15 thoughts on “Map , constrain and solar stuff”
  1. Avataaar/Circle Created with python_avatars Ian Harvey says:

    Something to try, charge a power wall battery bank, then use that to charge the car…
    Once battery bank is empty have a way to transfer to mains voltage…
    So, when it's less than 6A get it to turn off car and charge battery bank, then when the battery bank is able to supply enough current turn the charger on, if at any point the solar kicks in at higher than minimum then car charger turns on.
    I big enough power wall to charge the car over night if you're out in the day

  2. Avataaar/Circle Created with python_avatars OffGrid Aussie Prepper™ says:

    Solar cable is DOUBLE INSULATED, the dc current or voltage will not JUMP out of it, come on Julian u should know better then that, but never play with the ends not terminated into a dc circuit breaker.

  3. Avataaar/Circle Created with python_avatars Rambozo Clown says:

    Charge a transfer battery bank then use that to charge your car. Then you can bring in the charge at whatever power you want and also charge the car at whatever level you desire. I see this setup on quite a few people's solar setups both grid-tied and off-grid.

  4. Avataaar/Circle Created with python_avatars ReverendFlatus says:

    Rotary encoder instead?

  5. Avataaar/Circle Created with python_avatars dogastus says:

    Should you apply a litttle bit of hysteresis to the ADC output? Otherwise, you might adjust the pot to a position where it jitters between two values.

  6. Avataaar/Circle Created with python_avatars lint says:

    All very interesting. The time passed before I knew it, so I would have watched much longer. Till next time, cheerio.

  7. Avataaar/Circle Created with python_avatars PicoNano says:

    If you had used a multi position rotary switch and resistors, instead of a pot, you would know in a glance what your setting is set at.
    As it stands, you don't know if you've set it to 10% or 20% or…

  8. Avataaar/Circle Created with python_avatars Peter Stimpel says:

    That looks not just suspicious, that power cable looks like from such a picture out of some countries with all the wires crossing streets in a chaotic way. Interesting.

  9. Avataaar/Circle Created with python_avatars Dominic Davis-Foster says:

    SSEN wanted £4k to change our fuse to 100A, which would've entailed a whole new underground supply from the other side of the road.

  10. Avataaar/Circle Created with python_avatars Rob Thompson says:

    Idea… Could you replace the variable with a LDR (Light dependant resistor) so that your car charges more when the sun is bright and less when the sun is limited.
    I recon with a bit of finessing you could save more money when your car is pulling more Amps when the solar is producing more, Thus wasting less of your solar power to the pittance earned from the feed in tariff.

  11. Avataaar/Circle Created with python_avatars Mikael Rosencrantz says:

    Is there any way to sort out specific values so it skips for example "20"?

    I'm always so curious when I see fuses in the world. 60A sounds extreme. I got 3*16A in my home. Different systems of course, but it's just interesting why different countries uses so different systems.

  12. Avataaar/Circle Created with python_avatars donepearce says:

    Map and Constrain are a couple of seriously useful functions if you are not in too much of a hurry – which presumably you are not as the application is simply to read a pot. I have recently abandoned using pots on arduinos, and pretty much only use rotary encoders. They are much more reliable and barely any more expensive. It also makes limiting the range trivial

  13. Avataaar/Circle Created with python_avatars fuba44 says:

    I absolutely love this project, have you considered adding a "ramp" function so the rate of charge can only change a certain amount per second. That way it can't send max/min/max/min oscillating signals to your car.. (idiot proofing the input pot) thank you for sharing this project with us.

  14. Avataaar/Circle Created with python_avatars UKHeliBob says:

    HEX representation of number is a great way to help visualise the value of bits in a byte but has very little value for anything else. You might just as well use ordinary decimal numbers for what you are doing. Why do you prefer HEX in this case when all it does is to confuse things ?

    I noted with some amusement that you calculated the values in decimal and then converted them to HEX to use them in map() and constrain()

  15. Avataaar/Circle Created with python_avatars Olaf says:

    Why Hex are you a cyborg or something? XDDD

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