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SolarEdge Communication Systems

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Communication in a SolarEdge system has two distinct layers: 1. Optimizer-to-inverter — always via power line communication (PLC) on the DC string 2. Inverter-to-cloud — via RS485, Ethernet, Wi-Fi, or cellular

This page covers the inverter-to-cloud path and site communication options.

Communication Options

Protocol: Modbus RTU over RS485 serial

Use case: Multi-inverter sites, wired installations, sites without reliable Wi-Fi

Topology: Daisy-chain up to 31 inverters on one RS485 bus

Wiring: - A and B signal wires + ground - Twisted pair, shielded preferred - Maximum 1,000m bus length - Termination resistor (120Ω) required at each end of the chain

Field notes: - Check polarity — A and B are not interchangeable - Ground each shield at one end only to avoid ground loops - Use SolarEdge GO (BT connected) → Communication → RS485 to verify bus status

Use case: Sites with wired LAN available

Setup: Standard RJ45 connection to router/switch

Field notes: - Confirm DHCP is available or configure static IP - Check router firewall — SolarEdge requires outbound access on port 22222 (or cloud endpoint) - Ethernet is most reliable for commercial sites with network infrastructure

Use case: Residential sites with accessible Wi-Fi router

Setup: SolarEdge GO → Communication → Wi-Fi → enter SSID and password

Field notes: - Inverter Wi-Fi range is limited — check signal strength at inverter location - 2.4 GHz networks preferred (better range through walls) - Client must provide Wi-Fi credentials; note them in site documentation - Configure via SolarEdge GO (BT connected) → Communication → Wi-Fi - Wi-Fi reliability issues are common in older homes with weak router placement

Use case: Sites without reliable internet, commercial rooftops, remote locations

Hardware: SolarEdge cellular kit (SIM-based, plugs into inverter communication port)

Carriers: Typically AT&T or T-Mobile depending on kit

Field notes: - Verify cellular signal at the inverter location before installing kit - SIM may require activation via SolarEdge portal - Monthly data usage is minimal — SolarEdge data packets are small - Backup option when Wi-Fi drops or client changes router password

Verifying Communication Status

Via SolarEdge GO (Local BT)

  1. Connect to inverter via Bluetooth in GO
  2. Navigate: Communication settings
  3. View active communication type and connection status
  4. Check last successful cloud sync timestamp

Via SolarEdge GO (Fleet / Cloud)

  1. Open GO → Sites → select site
  2. Check "Last Communication" timestamp in site overview
  3. If >24h without data: investigate communication path
  4. Remote view available without going to site for initial triage

Via Legacy SetApp

  1. Connect to inverter via Bluetooth
  2. Navigate: Maintenance → Communication
  3. Use on older inverters where GO has limited connectivity

Common Communication Issues

Issue Possible Cause Action
No data for 24+ hours Wi-Fi password changed, router replaced Re-enter Wi-Fi credentials via SolarEdge GO (or SetApp on legacy)
Intermittent data gaps Weak Wi-Fi signal Move router closer or add extender
RS485 bus offline Polarity issue, cable damage, missing terminator Verify wiring, swap A/B if reversed
Cellular no connection Low signal, SIM issue Check signal, verify SIM activation
Site shows offline but producing Comms only — not a production issue Restore comms when convenient