Silfab SIL 420 QD

The Silfab SIL 420 QD is part of the Solar Panels test program at Consumer Reports. In our lab tests, Solar Panels models like the SIL 420 QD are rated on multiple criteria, such as those listed below.

Meets power claim: A panel with a better score will more closely meet its claimed output. Wattage output tests are performed under standardized light intensity conditions.

High temperature performance: A panel that performs well at this test will be better at producing power at the higher temperatures that will occur on a rooftop under full sun.

Low light performance: A model that scores well on this test will be better under low light situations, such as on cloudy days.