I realize that it is normal to display a low resting input voltage when dark. I think I read somewhere that is should be about 1/2 of battery voltage. With my first Array and Classic that is true. The resting input voltage is at about 30 for my 48 V system.
Here's the curious thing. My second array with a second Classic connected to the same battery bank shows a resting input voltage of 14.
They both work great. No worries, just curious. Why the difference?
Quote from: mtdoc on December 14, 2012, 01:42:09 AM
I realize that it is normal to display a low resting input voltage when dark. I think I read somewhere that is should be about 1/2 of battery voltage. With my first Array and Classic that is true. The resting input voltage is at about 30 for my 48 V system.
Here's the curious thing. My second array with a second Classic connected to the same battery bank shows a resting input voltage of 14.
They both work great. No worries, just curious. Why the difference?
Sometimes the input source just happens to load the input down some. I have seen some Classics that went down much lower
than 14 volts from a 24 volt battery. I think it was the PV array. Also, a large array may tend to load the input down more.
Especially older PV modules with a bit more leakage.
boB