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Two common reasons for a solar panel to register no voltage are a faulty inverter or charge controller. Other possible causes include a damaged PV module, poor wiring, shading, and temperatures higher than the ideal operating range.
Conducting a bi-annual survey of the installation site is a good idea. If shading is not an issue, most likely it will be the higher than normal operating temperature of the solar panels. It has been scientifically proven that the voltage drop rises with the rise in temperature. The higher the temperature, the lower will be the power output.
If your solar array does not produce any voltage or power, the three most probable reasons are: a damaged PV module, poor wiring, or shading and temperature higher than the ideal operating range.
The higher the temperature, the lower will be the power output. Adding more modules in series, and therefore increasing the string voltage, will eliminate this problem. Also, make sure that there’s sufficient air circulation beneath the panels and that this open space is not blocked in any way.
An abnormally high battery voltage reading can be a sign of a malfunctioning charge controller. The controller might be feeding too much power to the battery, causing the high voltage. Resetting the charge controller, or in severe situations, replacing it, can resolve this solar inverter issue.
The PV voltage needs to be a minimum of 120V to start up, and also 80V to continue operation. Causes of zero or low PV voltage: Not enough solar irradiance into the solar panels: Night. Cloud cover or bad weather. Shading – see this shading blog story for more information. Dirty panels. Seasonal differences. Wrong orientation and/or inclination.
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