I just bought a Sunsei solar panel that produces 6 watts... they have that diode so I don't have to worry about losing current at night... anyway... I don't really have good place to put it... right now its sitting on the passenger seat... so I'm wondering if I put it on behind the tinted side glass... how much energy will I not be producing.... has anyone fooled around with this??? thanks... 

And maybe I should have gotten the one that produces 18 watts...