Before installation, your installer will give you a clear estimate of how much electricity your system should generate (kilowatt-hours or kWh) yearly and for each month which varies, depending on time of year. It can also vary year-to-year somewhat based on weather and other factors. If you have monitoring set up, checking your system production through your online monitoring platform or phone app periodically is a great way to make sure your system is performing as expected. If you don’t have online monitoring, you can confirm your system is working properly by checking the inverter or monitoring unit display screen. These display screens should show cumulative production (kWh) over the year and the lifetime of the system.