Generation¶
Solar Electric¶
HEScore allows for a single photovoltaic system to be included as of v2016. In
HPXML, multiple PVSystem
elements can be specified to represent the PV
systems on the house. The translator combines multiple systems and generates the
appropriate HEScore inputs as follows:
Capacity Known¶
If each PVSystem
has a MaxPowerOutput
, this is true. If each
PVSystem
has a NumberOfPanels
or if each has CollectorArea
, this is
false. Preference is given to known capacity if available. Either a
MaxPowerOutput
must be specified for every PVSystem
or CollectorArea
must be specified for every PVSystem
.
DC Capacity¶
If each PVSystem
has a MaxPowerOutput
, the system capacity is known. The
system_capacity
in HEScore is calculated by summing all the
MaxPowerOutput
elements in HPXML.
Number of Panels¶
If MaxPowerOutput
is missing from any PVSystem
, the translator will
check to see if every system has NumberOfPanels
and calculate the total
number of panels.
If NumberOfPanels
isn’t available on every system, the translator will look
for CollectorArea
on every PVSystem. The number of panels is calculated by
summing all the collector area, dividing by 17.6 sq.ft., and rounding to the
nearest whole number.
Weighted Averages¶
The below quantities are calculated using weighted averages. The weights used are in priority order:
MaxPowerOutput
NumberOfPanels
CollectorArea
Which is the same data elements used to determine the PV sizing inputs above.
Year Installed¶
For each PVSystem
the YearInverterManufactured
and
YearModulesManufactured
element values are retrieved, and the greater of the
two is assumed to be the year that system was installed. When there are multiple
PVSystem
elements, a weighted average is calculated and used.
Panel Orientation (Azimuth)¶
For each PVSystem
the ArrayAzimuth
(degrees clockwise from north) is
retrieved. If ArrayAzimuth
is not available, ArrayOrientation
(north,
northwest, etc) is converted into an azimuth. A weighted average azimuth is
calculated and converted into the nearest cardinal direction (north, northwest,
etc) for submission into the array_azimuth
HEScore input (which expects a
direction, not a numeric azimuth).
Panel Tilt¶
For each PVSystem
the ArrayTilt
(in degrees from horizontal) is
retrieved. A weighted average tilt is calculated and submitted to the
array_tilt
HEScore input (which expects an enumeration, not a numeric tilt).
The tilt is mapped to HEScore as follows:
HPXML | HEScore |
---|---|
0 - 7° | flat |
8 - 22° | low_slope |
23 - 37° | medium_slope |
38 - 90° | steep_slope |