What happens when it’s cloudy, snowy or at night?

You will always have electricity because you will still be be tied to the grid.  Sometimes if the array is covered with snow you will recieve a notification from your monitoring system stating “system produced no power, system shut down or low power production”  No need to be concerned because when the sun returns it will melt the snow and your solar system will go back to normal.  If your system is producing more power than you are using, the net metering laws in Massachusetts allow you get credit for extra the unused kWh your system produces or alloocate it to another site within your load zone.