This article will break down the most important aspect of the specification sticker located behind every Renogy solar panel.
Max Power at STC: This is how much power the panel is rated at the Standard Test Condition, which is 1000 W/m2.
Open Circuit Voltage (Voc): This is the panel’s voltage level when it is not hooked up to a controller and battery. It is important when sizing systems with controllers as panels will have this value for a short period of time when the system is hooked up. Also, this is important when troubleshooting a solar panel.
Operating Voltage (Vmp): This is the voltage level of the panel when it is set up and operating. This is important for calculating wire gauge size and wire length.
Operating Current (Imp): This is the current being produced when the panel is set up and operating. This is important for calculating wire gauge size, wire length, and controller sizing.
Short-Circuit Current (Isc): This is the current produced when the panel is not connected to any loads, but the positive and negative wires of the panel are connected to each other. This is the highest current the panel will produce under STC.