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
Topic

AC vs. DC Basics

Understand how PV power is converted and used

Sign in to join the discussion.
Recent posts
No posts yet.

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