For example a solar panel that had a manufacturer provided STC (Standard Test Condition) or labeled rating of 100 Watts would have their panel tested by PVUSA and might be given a PTC rating or PVUSA rating of 89.4 Watts. It wasn't that the manufacturers were being dishonest it's just that PVUSA uses different parameters that they feel represent more real world conditions.
So the higher the PTC rating, the more power you'll get from a solar panel.
|Manufacturer Name||Module Model Number||Description||CEC PTC** Rating||Notes|
|*Mitsubishi Electric Corporationâ||PV-MF165EB3||165W Poly crystalline lead-free solder module with MC connector||146.9||NA|
|*Sharp Corporationâ||NE-Q5E2U||165W Multisilicon Module||145.2||NA|
|*BP Solarâ||BP4165S||165W 24V Mono
crystalline Module w/ Multicontact Conn.
|*GE Energyâ||GEPV-165-MCA||165W Single Crystal
Module w/MC connectors
|*Schott Solar, Inc.â||SAPC-165||165W Multisilicon Module||145.4||NA|
*The above mentioned company names are the property of and/or the registered trademarks of their respective owners. With exception to Mitsubishi Electric, Solatron Technologies, Inc. does not have any affiliation with any of these companies.
** PTC stands for "PVUSA Test Conditions." PTC watt rating is based on 1000 Watt/m2 solar irrandiance, 20 degree Celsius ambient temperature, and 1 meter/second wind speed. The PTC watt rating is lower than the "Standard Test Conditions" (STC), a watt-rating used by manufacturers.
Visit the State's website and compare Mitsubishi's performance for yourself !
The difference in PTC rated wattage may not seem like much, but add up the difference over 365 days per year for the next 25 years and the difference is obvious !