Acebeam        
Page 2 of 2 FirstFirst 12
Results 31 to 35 of 35

Thread: Solar voltage limiter?

  1. #31
    Flashaholic* Burnt_Retinas's Avatar
    Join Date
    May 2003
    Location
    Melbourne, Australia
    Posts
    396

    Default Re: Solar voltage limiter?

    No. It'll cook the 1W zener when the batteries are charged, which is then the zener 'kicks in' and limits the voltage.

    You'll have to use the other methods other people have suggested here.

    Chris

  2. #32

    Default Re: Solar voltage limiter?

    [ QUOTE ]
    Burnt_Retinas said:
    No. It'll cook the 1W zener when the batteries are charged, which is then the zener 'kicks in' and limits the voltage.

    You'll have to use the other methods other people have suggested here.



    [/ QUOTE ]

    First part's true, with four times the current (and therefore four times the power) 1.2 Watts will 'cook' a 1 Watt part. But not a two Watt, or two ones in series.....

    The idea still works just fine. You just need bigger parts for a bigger job.

    Doug Owen

  3. #33
    Flashaholic* Burnt_Retinas's Avatar
    Join Date
    May 2003
    Location
    Melbourne, Australia
    Posts
    396

    Default Re: Solar voltage limiter?

    True Doug, thanks. I should have thought the same but didn't. I guess I was too focussed on answering the question, rather than providing an equally effective and cheap solution.

    It may be worth noting, that a) if two in series are used, then they will each need to be half the required voltage ie 3V and, b) the power (read heat) still needs to be gotten rid of somehow regardless of the power capability of the part. One watt is not a lot however, so perhaps a large-ish PCB (PWB) piece of copper trace or similar heatsinking will do. Perhaps even the wires from the panel will suffice to take the heat away?.

    Chris

  4. #34
    Unenlightened
    Join Date
    Oct 2018
    Posts
    2

    Default Re: Solar voltage limiter?

    Quote Originally Posted by Burnt_Retinas View Post
    True Doug, thanks. I should have thought the same but didn't. I guess I was too focussed on answering the question, rather than providing an equally effective and cheap solution.

    It may be worth noting, that a) if two in series are used, then they will each need to be half the required voltage ie 3V and, b) the power (read heat) still needs to be gotten rid of somehow regardless of the power capability of the part. One watt is not a lot however, so perhaps a large-ish PCB (PWB) piece of copper trace or similar heatsinking will do. Perhaps even the wires from the panel will suffice to take the heat away?.

    Chris

    How would it differ for OP to use six 1v zeners in series across the 200ma pv output? Would increasing the number of zeners remove the need for heatsinking? I'm wanting to do this with a 12v 30-watt pv.

  5. #35
    Honorary Aussie
    Join Date
    Feb 2014
    Location
    USA
    Posts
    4,936

    Default Re: Solar voltage limiter?

    Great info, all, thanks!
    It is better to buy a beautiful, expensive, custom flashlight than to curse the darkness.

Page 2 of 2 FirstFirst 12

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •