Groups > sci.electronics.design > #519036

Re: Can a small photocell panel be connected to a flashlight type rechargable battery?

From	Jan Panteltje <pNaOnStPeAlMtje@yahoo.com>
Newsgroups	sci.electronics.design
Subject	Re: Can a small photocell panel be connected to a flashlight type rechargable battery?
Date	2018-10-12 07:36 +0000
Organization	A noiseless patient Spider
Message-ID	<pppitr$hou$1@dont-email.me> (permalink)
References	<fhntrd1aq3c9jkfp3haigrk512mdfc5aj8@4ax.com> <986vrddm75p51iimfob41mb9gvhpga930r@4ax.com> <ppoj5t$3ph$1@gonzo.alcatraz> <0k00sdt1dmep23fc5f6gcdnu6m89bjl52h@4ax.com>

Show all headers | View raw

Jeff Liebermann wrote 
>For example, when someone shorts a 300 watt panel, that generated
>power has to be dissipated somewhere, which means dissipated in the
>solar cells.  With 60 cells, that's 5 watts per cell at the MPP
>(maximum power point), which is not a trivial amount.
>
>The instructions for such tests often include some manner of warning
>not to leave the panels shorted for too long or they might overheat.
>Sometimes, they show a hot cell with an open circuit condition
>(usually when the shading protection diode goes open circuit).
>
>The tiny panel the OP is using will probably do nothing dangerous if
>the panel is shorted, but I consider it good practice to add the
>overheating warning since there's no clear boundary between what size
>panel is safe and unsafe to short.  In other words, if he burns his
>house down shorting a power source, I would want to at least claim
>that I warned him.

Do you have any reason to assume that a piece of metal of say 1 square inch exposed
to direct full sunlight will set things on fire?
Now how about silly con and glass?

Much more dangerous is all the magnifying stuff on my desk,
I deliberately move it out of the suns way.

Thread

Can a small photocell panel be connected to a flashlight type rechargable battery? oldschool@tubes.com - 2018-10-11 00:32 -0500
  Re: Can a small photocell panel be connected to a flashlight type rechargable battery? <698839253X6D445TD@nospam.org> - 2018-10-11 06:10 +0000
  Re: Can a small photocell panel be connected to a flashlight type rechargable battery? tabbypurr@gmail.com - 2018-10-11 05:51 -0700
  Re: Can a small photocell panel be connected to a flashlight type rechargable battery? George Herold <gherold@teachspin.com> - 2018-10-11 06:18 -0700
  Re: Can a small photocell panel be connected to a flashlight type rechargable battery? dplatt@coop.radagast.org (Dave Platt) - 2018-10-11 10:39 -0700
    Re: Can a small photocell panel be connected to a flashlight type rechargable battery? bitrex <user@example.net> - 2018-10-11 22:41 -0400
  Re: Can a small photocell panel be connected to a flashlight type rechargable battery? Jeff Liebermann <jeffl@cruzio.com> - 2018-10-11 12:14 -0700
    Re: Can a small photocell panel be connected to a flashlight type rechargable battery? Jasen Betts <jasen@xnet.co.nz> - 2018-10-11 22:34 +0000
      Re: Can a small photocell panel be connected to a flashlight type rechargable battery? Jeff Liebermann <jeffl@cruzio.com> - 2018-10-11 19:31 -0700
        Re: Can a small photocell panel be connected to a flashlight type rechargable battery? Jasen Betts <jasen@xnet.co.nz> - 2018-10-12 05:02 +0000
          Re: Can a small photocell panel be connected to a flashlight type rechargable battery? gnuarm.deletethisbit@gmail.com - 2018-10-11 23:05 -0700
          Re: Can a small photocell panel be connected to a flashlight type rechargable battery? Jeff Liebermann <jeffl@cruzio.com> - 2018-10-12 09:08 -0700
            Re: Can a small photocell panel be connected to a flashlight type rechargable battery? gnuarm.deletethisbit@gmail.com - 2018-10-12 09:36 -0700
              Re: Can a small photocell panel be connected to a flashlight type rechargable battery? Jeff Liebermann <jeffl@cruzio.com> - 2018-10-12 10:20 -0700
                Re: Can a small photocell panel be connected to a flashlight type rechargable battery? gnuarm.deletethisbit@gmail.com - 2018-10-12 10:37 -0700
            Re: Can a small photocell panel be connected to a flashlight type rechargable battery? gnuarm.deletethisbit@gmail.com - 2018-10-12 09:41 -0700
              Re: Can a small photocell panel be connected to a flashlight type rechargable battery? Jeff Liebermann <jeffl@cruzio.com> - 2018-10-12 10:04 -0700
            Re: Can a small photocell panel be connected to a flashlight type rechargable battery? Jasen Betts <jasen@xnet.co.nz> - 2018-10-12 19:24 +0000
              Re: Can a small photocell panel be connected to a flashlight type rechargable battery? Jeff Liebermann <jeffl@cruzio.com> - 2018-10-12 18:26 -0700
                Re: Can a small photocell panel be connected to a flashlight type rechargable battery? gnuarm.deletethisbit@gmail.com - 2018-10-12 22:27 -0700
                Re: Can a small photocell panel be connected to a flashlight type rechargable battery? Jasen Betts <jasen@xnet.co.nz> - 2018-10-13 05:32 +0000
        Re: Can a small photocell panel be connected to a flashlight type rechargable battery? John S <Sophi.2@invalid.org> - 2018-10-12 02:12 -0500
          Re: Can a small photocell panel be connected to a flashlight type rechargable battery? gnuarm.deletethisbit@gmail.com - 2018-10-12 09:15 -0700
            Re: Can a small photocell panel be connected to a flashlight type rechargable battery? John S <Sophi.2@invalid.org> - 2018-10-13 15:14 -0500
              Re: Can a small photocell panel be connected to a flashlight type rechargable battery? gnuarm.deletethisbit@gmail.com - 2018-10-14 20:34 -0700
                Re: Can a small photocell panel be connected to a flashlight type rechargable battery? John S <Sophi.2@invalid.org> - 2018-10-15 20:39 -0500
                Re: Can a small photocell panel be connected to a flashlight type rechargable battery? gnuarm.deletethisbit@gmail.com - 2018-10-15 21:28 -0700
                Re: Can a small photocell panel be connected to a flashlight type rechargable battery? John S <Sophi.2@invalid.org> - 2018-10-16 18:08 -0500
                Re: Can a small photocell panel be connected to a flashlight type rechargable battery? gnuarm.deletethisbit@gmail.com - 2018-10-16 16:29 -0700
                Re: Can a small photocell panel be connected to a flashlight type rechargable battery? Jeff Liebermann <jeffl@cruzio.com> - 2018-10-16 16:47 -0700
                Re: Can a small photocell panel be connected to a flashlight type rechargable battery? John S <Sophi.2@invalid.org> - 2018-10-17 02:23 -0500
          Re: Can a small photocell panel be connected to a flashlight type rechargable battery? Jeff Liebermann <jeffl@cruzio.com> - 2018-10-12 09:23 -0700
            Re: Can a small photocell panel be connected to a flashlight type rechargable battery? gnuarm.deletethisbit@gmail.com - 2018-10-12 09:48 -0700
              Re: Can a small photocell panel be connected to a flashlight type rechargable battery? Jeff Liebermann <jeffl@cruzio.com> - 2018-10-12 17:57 -0700
                Re: Can a small photocell panel be connected to a flashlight type rechargable battery? gnuarm.deletethisbit@gmail.com - 2018-10-12 22:19 -0700
            Re: Can a small photocell panel be connected to a flashlight type rechargable battery? Jasen Betts <jasen@xnet.co.nz> - 2018-10-12 19:56 +0000
        Re: Can a small photocell panel be connected to a flashlight type rechargable battery? Jan Panteltje <pNaOnStPeAlMtje@yahoo.com> - 2018-10-12 07:36 +0000
          Re: Can a small photocell panel be connected to a flashlight type rechargable battery? George Herold <gherold@teachspin.com> - 2018-10-12 05:59 -0700
            Re: Can a small photocell panel be connected to a flashlight type rechargable battery? Jan Panteltje <pNaOnStPeAlMtje@yahoo.com> - 2018-10-12 13:06 +0000
          Re: Can a small photocell panel be connected to a flashlight type rechargable battery? gnuarm.deletethisbit@gmail.com - 2018-10-12 09:18 -0700
          Re: Can a small photocell panel be connected to a flashlight type rechargable battery? Jeff Liebermann <jeffl@cruzio.com> - 2018-10-12 09:44 -0700
            Re: Can a small photocell panel be connected to a flashlight type rechargable battery? <698839253X6D445TD@nospam.org> - 2018-10-12 17:57 +0000
        Re: Can a small photocell panel be connected to a flashlight type rechargable battery? whit3rd <whit3rd@gmail.com> - 2018-10-12 23:23 -0700
          Re: Can a small photocell panel be connected to a flashlight type rechargable battery? gnuarm.deletethisbit@gmail.com - 2018-10-13 04:56 -0700

csiph-web