DC disconnects are switches that complete or interrupt a flow of DC electricity. On a solar PV system, the DC disconnect is placed between the solar array and the power inverter so it can easily be thrown if you (or the fire department) need to shut off solar power to the house.

Properly sized and installed DC disconnects provide an easy, obvious way to shut down a renewable energy system and are essential for safety and code-compliance. For help choosing or sizing DC disconnects, call our Tech Desk at 800-919-2400 for their expertise.

"DC-rated equipment, because it is less common, is more expensive, but don’t be tempted to use its less expensive AC cousin...it's not worth the risk."

Solar Living Sourcebook 14th Edition
Chapter 4: From Panel to Plug

DC Disconnects from Real Goods