Solar has a few efficiencies that you will need to consider. One is during the summer months, solar panels tend to be less efficient due to the negative impact of high temperatures on the performance of PV cells. As the temperature rises, the output voltage of a solar panel decreases, leading to reduced power generation. For every degree Celsius above 25°C (77°F), a solar panel’s efficiency typically declines by 0.3% to 0.5%. So if it is 105°F, that could equate the temperature of the panels to be 150°F. At that temperature, the PV panels are 73°F above the nominal temperature, which could reduce the generation by approximately 20% or more.

Second, the efficiency of solar panels going from DC to AC is typically around 95% to 98%. This means that for every 100 watts of DC power generated by the solar panels, 95 to 98 watts of AC power are produced. The remaining 2 to 5 watts are lost in the conversion process.

There are a number of factors that can affect the efficiency of a PV system, including:

• The type of inverter used.
• The temperature of the inverter.
• The amount of sunlight versus cloud cover, trees, etc.
• The amount of sunlight versus dirt and debris on the panels.
• The quality of the wiring.
• The quality of the PV panels to ensure they are temperature coefficient.