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element namegeometry
defined inhttp://solargis.info/schema/common-pv.xsd
description

Parametrization of PV system mounting type used for calculating GTI and PVOUT. If this element is missing and GTI/PVOUT is requested, flat-lying PV panels are considered (GTI=GHI). Examples:

<pv:geometry xsi:type="pv:GeometryFixedOneAngle" azimuth="180" tilt="25"/>

<pv:geometry xsi:type="pv:GeometryOneAxisHorizontalNS" rotationLimitEast="-90" rotationLimitWest="90" backTracking="true" axisDeviation="0"/>

<pv:geometry xsi:type="pv:GeometryOneAxisInclinedNS" axisTilt="30" rotationLimitEast="-90" rotationLimitWest="90" backTracking="true" axisDeviation="0"/>

<pv:geometry xsi:type="pv:GeometryOneAxisVertical" tilt="25" rotationLimitEast="-180" rotationLimitWest="180" backTracking="true"/>

<pv:geometry xsi:type="pv:GeometryTwoAxisAstronomical" rotationLimitEast="-180" rotationLimitWest="180" tiltLimitMin="10" tiltLimitMax="60" backTracking="true"/>

contentnone
@type*

required, concrete type of given geometry. Use one from GeometryFixedOneAngle, GeometryOneAxisHorizontalNS, GeometryOneAxisInclinedNS, GeometryOneAxisVertical, GeometryTwoAxisAstronomical, see table below

@azimuthorientation of tilted panel surface in degrees, defined as true geographical azimuth (0:north, 90:east, 180:south, 270:west, 360:north), default is 180 deg., the attribute is not defined for a horizontal surface, required only for 'GeometryFixedOneAngle' type
@tilttilt of panel surface in degrees range (0, 90), 0=horizontal, 90=vertical surface, required for 'GeometryFixedOneAngle' and 'GeometryOneAxisVertical' types
@axisTilt

optional, tilt of rotating inclined axis in degrees, 0 = horizontal, 90 = vertical axis, only considered for 'GeometryOneAxisInclinedNS',

WARNING: if this attribute is missing, the value defaults to 30 degree.

@axisDeviation

optional, Tracker axis of GeometryOneAxisHorizontalNS or GeometryOneAxisInclinedNS types is typically placed in the North-South direction. This attribute allows for deviation of the axis direction. Take the endpoint of the axis which is closer to the Equator. Center of the rotation is the midpoint of the axis. Rotate the endpoint eastward by using positive values ranging from 0 deg. to 45 deg.. Rotate the endpoint westward by using negative values ranging from -45 deg. to 0 deg.. Zero degree value means no deviation (the default, North-South axis alignment). Please see the explanation below.

@rotationLimitEast

optional, default is the unlimited motion in the range (-180, 180), used for all trackers. The general rule is: negative value is used for the east side, positive for the west side, the same rule applies for both hemispheres). The meaning is slightly different for different type of trackers:

GeometryOneAxisHorizontalNS: rotation limits are defined as tilt of tracker table relative to its central position (which is horizontal=0 deg.), both limits are typically symmetric, e.g., rotationLimitEast=-50, rotationLimitWest=50

GeometryOneAxisInclinedNS: rotation limits are defined as tilt of tracker table relative to its central position (in this case the inclined plane defined by axisTilt attribute), both limits are typically symmetric, e.g., rotationLimitEast=-50, rotationLimitWest=50

GeometryOneAxisVertical: rotation limits are defined relative to 0 deg. (initial tracker position regardless of hemisphere), default range from -180 to 180 deg (-90 deg. east and +90 deg. west)

GeometryTwoAxisAstronomical: definition (for vertical axis) is the same as with GeometryOneAxisVertical tracker

@rotationLimitWestoptional, westward motion limit, described above
@tiltLimitMinoptional, only used with the horizontal axis of 'GeometryTwoAxisAstronomical' tracker. Limit is defined in the range of degrees (-90, +90), relative to the horizontal position of the tracking surface (0 deg.). Example: tiltLimitMin="0" tiltLimitMax="60", the tracker follows the sun elevation in the range from horizontal position to 60 degree of tilt.
@tiltLimitMaxoptional, max tilt of the tracking surface, described above
@backTrackingoptional boolean value, default is 'false' - tracker moves freely regardless of the neighbors, value is 'true' - tracker moves in the way it avoids shading from neighboring tracker constructions.

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GeometryFixedOneAngle

GeometryOneAxisVertical

GeometryOneAxisInclinedNS

GeometryOneAxisHorizontalNS

GeometryTwoAxisAstronomical

  • fixed surface described by azimuth and tilt
  • self-shading simulation supported
  • single vertical axis tracking
  • tracks sun azimuth
  • tilted surface
  • rotation limits
  • back-tracking
  • relative column spacing applied
  • self-shading simulation not implemented
  • single inclined axis tracking
  • tracks sun azimuth
  • tilted surface
  • rotation limits
  • axis deviation support
  • back-tracking
  • relative column spacing applied
  • self-shading simulation supported
  • single horizontal axis tracking
  • tracks sun azimuth
  • rotation limits
  • axis deviation support
  • back-tracking
  • relative column spacing applied
  • self-shading simulation supported

  • two axes tracking
  • tracks sun elevation and azimuth
  • rotation limits both axes
  • back-tracking
  • relative column spacing applied
  • self-shading simulation not implemented


Axis deviation attribute explanation:

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Northern hemisphere,

tracker axis is deviated 30 deg. westward.

axisDeviation=-30 (true geog.azimuth = 210 deg.)

Northern hemisphere,

tracker axis is deviated 30 deg.eastward.

axisDeviation=+30 (true geog.azimuth = 150 deg.)

Southern hemisphere,

tracker axis is deviated 30 deg. westward.

axisDeviation=-30 (true geog.azimuth = 330 deg.)

Southern hemisphere,

tracker axis is deviated 30 deg.eastward.

axisDeviation=+30 (true geog.azimuth = 30 deg.)


PV system

element namesystem
defined inhttp://solargis.info/schema/common-pv.xsd
description

Parametrization of the PV system. Required for simulating PVOUT parameter.

contentrequired one <module> element, required one <inverter> element, required one <losses> element, optional one <topology> element,
@installedPower*

required float value (greater than zero). Total installed DC power of the PV system in kilowatts-peak (kWp). The total PV system rating consists of a summation of the panel ratings measured in STC.

@installationTypeoptional, use one from FREE_STANDING (default), ROOF_MOUNTED, BUILDING_INTEGRATED. This property of the PV system helps to estimate how modules are cooled by air. For sloped roof with PV modules on rails tilted at the same angle as the roof choose 'ROOF_MOUNTED' value. For PV modules incorporated into building facade choose 'BUILDING_INTEGRATED' value. This option is considered as the worst ventilated. As the best ventilated option is considered 'FREE_STANDING' installation. This typically means stand-alone installation on tilted racks anchored into the ground. Also choose this option if a PV system is installed on a flat roof.
@dateStartup

optional string formatted as "yyyy-mm-dd" (example 2015-01-01). Start-up date of the PV system (unpacking of modules). This parameter is used for calculation of degradation of modules caused by aging. If omitted, the degradation is not taken into account.

@selfShading

optional, default is 'false'. The parameter affects PV power calculation for 'GeometryFixedOneAngle' geometry, then 'GeometryOneAxisInclinedNS' and 'GeometryOneAxisHorizontalNS' trackers if backTracking="false". When 'selfShading' is switched on, the simulated PV power is typically lower comparing to standalone PV construction not affected by shading from its neighbors. With trackers, always switch off 'backTracking' attribute, because the back tracking avoids self-shading.

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