AC Wiring

This document is designed to help designers create AC systems for their Projects in HelioScope. AC wiring is an optional function of HelioScope, and it follows the same general principles as DC system design. At the top of the electrical Designer, click “AC” to enable the AC design menu.

AC Design and Components

General principles:

  • The AC design in HelioScope models wire losses based on the resistance and current on the conductors each hour. Note that it does not incorporate transformer efficiency losses.
  • As with the DC design, AC conductors are drawn automatically between components.
  • Conductor lengths are calculated with four conductors over the distance by default. This is appropriate for three-phase AC runs, but for single-phase or delta circuits, HelioScope will assume three conductors.

AC design has four main controllable inputs, each shown here:

A. AC Home Run: conductor from the inverter to the AC Panel or PCC

B. AC Panel (optional): electrical box that combines one or more sources into a single circuit with larger conductors. When selected, these can be dragged around the map to adjust the conductor distances.

C. PCC Home Run (optional, if AC Panel included): conductors from the AC Panel to the PCC

D. PCC: Point of common coupling, also known as point of grid connection. This can be dragged around the map to adjust the conductor distances. Note that any single Design has just one PCC point.

Note that HelioScope will divide the inverters across the AC panels as evenly as possible. For example, the above project has 15 inverters. Choosing seven AC panel inputs will result in three AC Panels (15 / 7 = 2.1, which rounds up to 3), and then HelioScope will split the inverters into 3 groups of 5. Choosing 8 AC panel inputs will result in two AC Panels (15 / 8 = 1.9, which rounds up to 2), and HelioScope will split the inverters into 2 groups of 7 and 8.

Learn more about How to Configure Transformers

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