Maintenance Guides / Energy & Power

Test solar AC and DC disconnects

Difficulty: moderateTime: 10 mins

Why it matters

Disconnects must operate freely for emergency shutdown; corrode shut over time.

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How to do it

  • 1

    Locate the DC disconnect between panels and inverter.

  • 2

    Toggle fully off, then back on.

  • 3

    Note any sticking or grinding sounds.

  • 4

    Locate the AC disconnect between inverter and panel.

  • 5

    Repeat smooth on-off test.

  • 6

    Contact installer to clean/replace stiff disconnects.