From: gherold@teachspin.com   
      
   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.   
      
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