PV wattage tester

Hi All. Is there a portable tester that ascertains the stated wattage of individual PV panels available on the open market? I want to test the power of the panels to be sure they’re not 300W types labelled as 330W or 350W. Thanks.

Hi Alloy,

Unfortunately the solar panel testers (known as PV IV curve testers) are extremely expensive and cost several thousand dollars, see link below. Do you want to test panels which are installed on your home? What brand panels are they or do you have a copy of the data sheet?


Thanks a lot, Svasky. Very useful information. It seems the HT guys have other very useful devices I will need to maintain installations as well.