DIY Solar panel setup on a budget

Discussion in 'Hobby Engineering' started by Mathuisella, Oct 15, 2013.

  1. Recharge

    Recharge Member

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  2. choppa

    choppa Member

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    Looking good. Is that you?

    I wonder where all the laptop cells came from!
     
  3. Stanza

    Stanza Member

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    That’s a lot of work checking all those cells....
    Not too bad if they are from a know source and all equal....

    I believe he gets those from a know supplier.... not just random laptop batteries..... which would save him heaps of time

    .
     
  4. Recharge

    Recharge Member

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    lol naa not I I'm afraid, though he does live pretty close just a suburb over.

    and yes. he gets his supplied from a recycling contact, and yes they are all random, and has done for a few years now, there would be almost no possible way to do this sort of volume otherwise.
    but he did all the leg work and the effort to build such contacts up, so he's earned it.
     
  5. Recharge

    Recharge Member

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  6. mibberz

    mibberz Member

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    a guy is selling a heap of 36V solar panels, can they be used with a 12 or 24V system or is it not worth the effort?
     
  7. Recharge

    Recharge Member

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    they can with any MPPT controller.
    as to being worth it, depends on your application.
    what were you thinking of doing?
     
  8. Stanza

    Stanza Member

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    36v prob really 30v panels Eg 60cell will be too low for 24v system.... unless you series two together
    Will just work on a full sunny day at full power.... but borderline On less than those days
     
  9. money_killer

    money_killer Member

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    Sure can be. how many watts?
     
  10. Stanza

    Stanza Member

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  11. Stanza

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    Short version is.... 60 cell are 37ish volts not under load and around 29.8 volts under load....

    29.8v is not really enough to charge 24v batteries....

    24v batteries are around 28.8v and a bit above charging

    Eg think 12v system 13.6v to to 14.4v charging..... then double it (24v is 12v doubled)
     
  12. Stanza

    Stanza Member

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    Mine over a couple o days
     

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  13. Stanza

    Stanza Member

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    And over last month....

    you can see the voltages get up around the max those panels can put out by themselves

    you better to series them up in pairs.... and then get an mppt controller.... or look out for 72cell panels if your going PWM controller
     

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  14. vk2fro

    vk2fro Member

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    Yeah you really need to be around 5-8 volts above the maximum charge voltage (including equilization if using LA) to get decent performance out of a panel even with an mppt (in fact most mppt's won't "turn on" until the panel voltage is +5v above the current battery voltage). I have roughly 80V feeding my 12V LFP's regulator (a victron) hence its always full by lunchtime. At times I've seen 30A going into the battery.
     
  15. rockofclay

    rockofclay Member

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    Well, you could use a boost controller, but then you would need to be under.
     
  16. Recharge

    Recharge Member

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  17. vk2fro

    vk2fro Member

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    Shame that Battery Hookup place won't ship to Australia - David (I've left him heaps of encouraging comments on his films) produces top notch videos. Hes got the big daddy Victron charge controller, and a stack of LifePo4's amoungst other chemistries running his whole house.

    His videos are well worth a watch :)
     
  18. Recharge

    Recharge Member

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  19. Butcher9_9

    Butcher9_9 Member

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    Would still be a way off from the sounds of the Wikipedia article.
     
  20. Recharge

    Recharge Member

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    most of the stuff he covers is either a ways off or questionably likely, but still, I though it interesting, and informative.
     

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