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Solis DC-INTF: Abnormal DC Input Current

Updated June 2026 · Reviewed for technical accuracy · ~2 min read

DC-INTF (DC interference, code 1027) means the Solis saw an abnormal current on its DC (panel) input. A common cause is a DC wiring issue, for example strings connected in a way the inverter does not expect. A restart can clear a transient, but a recurring DC-INTF usually means the PV wiring needs checking.

What usually causes DC-INTF

  • A PV wiring issue, such as strings wrongly or partially connected.
  • A loose DC connection on the input side.
  • A transient a restart resolves.

How to handle it safely

Hands off the DC terminals Checking whether wiring was recently changed is safe. Physical DC wiring work is for your installer, and PV inputs are live in daylight.
  1. Note any recent changes. Did DC-INTF start after new panels or wiring work? That points to a connection issue from then.
  2. Power-cycle once. AC breaker off, then the DC isolator, wait 5 minutes, restart, to clear a transient.
  3. If it returns, have your installer verify the DC string wiring and connections. Don't probe the DC wiring yourself.

Related Solis codes

Reve-DC, Reversed DC OV-DC, DC overvoltage UN-BUS, DC bus low

Helpful guides

Error codes explained How to safely restart your inverter

Sources

  • Solis inverter alarm-code list (DC-INTF = abnormal DC input current; verify DC wiring is not falsely connected, restart).
  • Solis installer documentation.
⚠️ Safety disclaimer. Solar inverters carry lethal DC and AC voltage even when "off", and PV inputs are live in daylight. This guide covers noting recent changes and a single safe power cycle only. DC wiring checks must be done by a licensed installer.