PVWatts – The Ultimate Calculator.

NREL's PVWatt's system savings calculator tool is so powerful that we even use it right here in our own office. With its dynamic ability to pull in local incentive and utility data along with accurate solar insolation charts through the entered address, this system sizer is unrivaled in both its ease-of-use and accuracy.

By inputting your customer's system size and address, you'll instantly be able to calculate the system's monthly energy value.

Use PVWatts Calculator

NREL PVWatts System savings calculator