Solar PV can be modeled in Snugg Pro as both an existing home specification as well as an optional improvement measure. If the home has an existing solar system, you can specify it in our inputs screen. The only required fields are the system size (in kW), the slope of the array, the orientation, and the year the panels were manufactured (for de-rating purposes).
Then, regardless if there is an existing system or not, you can specify a new or improved system in the refine screen or by clicking on the related measures link in the Context pane, and then choosing New System on the Improved side. Once you model, you’ll see the estimated annual production for that system in the gray field at the bottom of the section. Then be sure to be sure to set the measure to recommended.
If the home has an existing PV system and you specify it in the PV inputs, the estimated monthly production will be added to the kWh number you specified for each month in the utility bills. This will improve the calibration of electric bills when there is a PV system on the existing home.
If the PV system produces more electricity than the home consumes, you'll see a negative number in the metrics panel and report page for either the base or improved side (depending if it's an existing system or a new one). If the home still uses fuels other than electricity, your % savings might not be 100 or greater since the home is still burning fuel even though the excess PV production might outweigh the fuel burning. If it was an all electric home, then you would see the every savings % as greater than 100. At the same time, if the home produces more electricity than it consumes, you will only get a financial credit up to net-zero production. Since the regulations vary from state to state for net-metering, it's impossible for us to know what kind of value to assign to overproduction of PV, so we cut off the savings amount at net zero.
Lastly, the DOE’s Home Energy Score will be supporting these same PV fields and will incorporate the savings into their score calculation.