SolarEdge ZigBee Guide D'installation page 15

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Verify signal strength: Check that at least two signal strength
LEDs are ON, which indicates medium signal strength. If only
one LED is ON, the signal strength is Low. Consider relocating
the home gateway closer to the inverter to improve reception.
If all signal strength LEDs are OFF, consider using a SolarEdge
ZigBee repeater (sold separately) between the home gateway
and the inverter. Refer also to the troubleshooting in Appendix
A of the SolarEdge Home Gateway Installation Guide.
MAN-01-00155-1.0
SolarEdge ZigBee Kit Quick Installation Guide
13