NEUTRAL TO EARTHGROUND VOLTAGE

Solar photovoltaic power generation voltage in the United States
includes as well as local , mostly and increasingly from arrays. In 2023, utility-scale solar power generated 164.5 (TWh), or 3.9% of . Total solar generation that year, including estimated small-scale generation, was 238 TWh. [pdf][FAQS about Solar photovoltaic power generation voltage in the United States]

Measure the open circuit voltage of the photovoltaic panel
Read the voltage on your multimeter and compare it to the open circuit voltage (Voc) listed on the back of your panel. If your voltage reading is negative, reverse the probes and measure again. [pdf]
How much tilt should photovoltaic panels have to be to be effective
To optimize performance, tilt your panels at an angle that is 10-15 degrees less than your latitude. For example, if you live at a latitude of 40 degrees, set your panels at about 25-30 degrees. [pdf]