*You probably won't be happy with a PWM and nominal 12 volt panels in difficult low light conditions. You might do better with a 24 volt panel and pwm or with MPPT.*
"This is TOTALLY backwards. MPPT will never out perform a PWM in low light conditions.
Also, MPPT is NOT a better performer than PWM for <600-800 watts of panels. "
In another thread, it was clearly shown in a side by side test that a single 12v panel thru mppt did way better than thru pwm, in rainy, cloudy conditions. This is because panel amps take a nose dive in such conditions. PWM relies on panel current more so than panel voltage, while mppt relies more on panel voltage to achieve its gains. I just did a 280w mppt run yesterday, using two 12v panels in series, in cloudy conditions, and it definitely did better than any pwm/parallel would have.
Contrary wise, pwm has the advantage in hot sunny conditions. This is because high panel temps result in higher Isc but lower voltage.
