From: gherold@teachspin.com   
      
   On Monday, October 22, 2018 at 9:44:54 AM UTC-4, George Herold wrote:   
   > On Sunday, October 21, 2018 at 7:50:24 PM UTC-4, Sebastia RodaMon wrote:   
   > > Hi - I got a brand new solar cell "Eco Line ES10M36".   
   > >   
   > > In my garden, under full sun it provides 21 volts and 500 mA,   
   > > and under big shadow it gives 18 volts and 30 mA.   
   > >   
   > > Load is a 24 volt bulb lamp in series with the Fluke.   
   > >   
   > > As the voltage margin is small, I want to detect the intensity   
   > > to determine if there is sun or not.   
   > >   
   > > What electronic circuit would you recommend to do it ?   
   > >   
   > > If I place 2 resistors conected in serial,   
   > > the voltage drop will have the same small margin the cell has ...   
   > >   
   > > Thanks.   
   >   
   > Sounds like you have some circuit working already.   
   > I don't know (big) solar cells.  For little photodiodes and   
   > things you can either measure the open circuit voltage   
   > (V~log (Intensity)) or the short circuit current,   
   > (I~ Intensity)   
   >   
   > George h.   
      
   If your'e getting power from it, then measure I-V   
   along the 'diode' curve... modulate something a little bit.   
      
   George H.   
   (are solar panels at all close to 'ideal diodes'?)   
      
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