It depends on the size system you have. Generally, if we have the space and correct solar orientation we try to size a system large enough to net zero a home owners electric bill and generate close to the same amount they are using. With solar, if the sun is out and you are consuming electric power, your solar-generated power will be consumed without it ever being registered by your utility meter. If your system produces more power than you use, you will get credit from the utility company for the excess generated towards your future consumption or you can allocate it to another location nearby. This is called Net Metering.