Array Types

The Array Generator supports various types of arrays, each with distinct properties. In addition to fixed-tilt arrays, users can create east-west racks, single-axis trackers, multi-row trackers, V-racks, and solar fences for placement.

Purpose of array types

Array types define the structural concept that is used by the Array Generator when creating PV table definitions for placement in Helios 3D. The selected array type influences which geometry rules, inclination behavior, post positions, height references, row distances and placement restrictions are available for the generated array. Choose the array type according to the mechanical mounting system that shall be represented in the PV layout.

V-racks are similar to east-west racks but allow for positive module inclination angles, measured from the center to the outer edge. The height of the array is also measured at the center, as it represents the lowest point. For both array types, the user defines one side of the rack, which is then mirrored at a configurable distance.

Choosing the correct array type

Use a fixed-tilt array for standard south-facing or uniformly inclined module tables. Use an east-west rack when two mirrored module sides are arranged with opposite inclinations and the system does not require a calculated shadow cast between the two sides. Use a V-rack when the mirrored rack geometry is similar to an east-west rack but uses positive module inclination angles from the center towards the outer edge. Use a tracker when the module table is represented by a rotating support structure and a rotation point must be defined. Use a solar fence when modules are installed vertically with predefined geometry restrictions.

Before defining an array type

Before creating or editing an array definition, make sure that the relevant module, support and post data are available and that the intended mounting concept is known. The array type should be selected before detailed geometry values are entered, because some parameters may be enabled, disabled or interpreted differently depending on the selected type.

Special characteristics of array types

Tracker

• The array height is related to the outer posts.
• The rotation point for the modules needs to be set.

East-west and V-racks

• Need a minimum row distance to be set, as no shadow cast is calculated.

Because no shadow cast is calculated for east-west and V-rack configurations, the minimum row distance must be defined carefully. This value directly affects the spacing between rows during placement and should match the intended mounting system, maintenance requirements and project-specific layout rules.

Solar fences

• Have several predefined and fixed options:
  • The array height is always fixed to the bottom edge.The module inclination is always 90°.The maximum slope and distance reference on page “Common” are disabled, same as several options for post position and orientation. For this array type those options are not supported.
  • The installation type is set to connected, so neighboring tables share one post.

• An overhang value is required on both sides, so the post geometry doesn’t collide with the module. The example post P-01 is displayed correctly with an overhang of 50mm (half of the post width).

Solar fence arrays use fixed geometry assumptions. Several settings are disabled because the array type represents a vertical installation concept with connected tables and shared posts. If expected options are not available in the Common tab or in the post settings, verify whether the selected array type is Solar fence.

Typical issues

If an array does not behave as expected during placement, first check whether the correct array type was selected. Some parameters are only available for specific array types, while other parameters may be disabled by design. For solar fences, verify the required overhang values to avoid collisions between post geometry and modules. For east-west and V-racks, verify the minimum row distance because no shadow cast calculation is used for these array types.

Related topics

For the next configuration steps, continue with New Array Definition, Common Tab, Module Support, Posts and Array Drawing. For the use of the defined arrays in the layout workflow, see Array Placement, Arrays, Rows and Placement Results.