Solar Performance in Massachusetts
We installed a 22 panel (400W each) solar system to our house in July 2023. This article provides some real world data on the performance of the system through a twelve month period. To provide the necessary context: the house is a mostly standard three bedroom single family house with almost all electric appliances, such as heat pumps, an energy recovery ventilator, dehumidifier, sump pump, water heater, refrigerator etc. It is located in Massachusetts around 42 N latitude. Panels are installed on a south facing roof as a single block and connected to a SolarEdge inverter rated at 7.6 kWh AC output. There is a Powerwall battery. We also switched to an EV car around last February which is charged solely at home. Let's start with the electrical balance sheet :) Left side of each bar is the electricity produced by solar panels (yellow) and bought from the city grid (red). The right side shows the consumption breakdown by house usage (blue), EV car charging (green) and the surplus (gr...