AC vs. DC Basics (Topic 3) in Module 2 – Solar-PV-NABCEP-Associate (BG)

AC vs. DC Basics

  • DC (direct current): current flows in one direction. PV modules produce DC.
  • AC (alternating current): current changes direction periodically (in the U.S., typically 60 Hz). Homes and the grid use AC.

Why PV uses an inverter

A grid-tied PV system uses an inverter to convert DC from the array into AC synchronized with the utility grid.

Common exam focus

  • Identify where DC exists vs where AC exists in a system
  • Understand that switching/isolating AC does not automatically de-energize DC sources
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AC vs. DC Basics

Understand how PV power is converted and used

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AC vs. DC Basics

  • DC (direct current): current flows in one direction. PV modules produce DC.
  • AC (alternating current): current changes direction periodically (in the U.S., typically 60 Hz). Homes and the grid use AC.

Why PV uses an inverter

A grid-tied PV system uses an inverter to convert DC from the array into AC synchronized with the utility grid.

Common exam focus

  • Identify where DC exists vs where AC exists in a system
  • Understand that switching/isolating AC does not automatically de-energize DC sources