Solis G-PHASE: Unbalanced 3-Phase Grid
G-PHASE (code 1016) appears on three-phase Solis inverters and means it detected an unbalanced or abnormal phase condition on the grid, so it stopped. It usually relates to the three-phase supply or the AC connection. A restart clears transients; a recurring G-PHASE points to the supply or the wiring.
What usually causes G-PHASE
- An unbalanced three-phase supply from the utility.
- A missing or weak phase, or a poor AC connection on one phase.
- A transient grid disturbance a restart resolves.
How to handle it
- Power-cycle the inverter. AC breaker off, then the DC isolator, wait 5 minutes, restart. A transient G-PHASE often clears.
- Check whether the grid itself is normal. If the wider supply is unstable or one phase is weak, that is the source.
- Have the AC connection checked. A loose connection on one phase can trigger it. This is an installer task.
- If G-PHASE persists, your installer should verify the three-phase connection and supply.
Related Solis codes
FAQ
I have a single-phase system. Why G-PHASE?
G-PHASE is a three-phase grid code. On a single-phase inverter it should not normally appear; if it does, contact your installer to review the configuration.
Helpful guides
Sources
- Solis inverter alarm-code list (G-PHASE = grid has unbalanced 3-phase; verify grid connection, confirm grid is normal).
- Solis installer documentation.
⚠️ Safety disclaimer. Solar inverters carry lethal DC and AC voltage even when "off". This guide covers a safe power cycle only. Three-phase connection and supply checks must be done by a licensed installer or electrician.