Growatt Warning 21 warning: PV power insufficient

What it means

The panels aren't producing enough power right now. Cloudy weather or dusty panels are the usual reasons.

Likely causes

• Cloudy or rainy weather
• Dusty or dirty panels
• Shading

What you can safely check

1. Compare with the weather – heavy cloud or rain lowers solar output.
2. Rinse dusty panels with a garden hose while standing on the ground.

When to call a pro

If it doesn't clear on its own, happens often, or comes with burning smells, heat or noise, call a qualified installer.