Port Forwarding

Caution

Modbus TCP has no built-in authentication. Exposing inverter ports directly to the internet is a security risk. Only do this if you understand the implications and have appropriate firewall rules in place. Tailscale is the recommended alternative.

Port forwarding lets you reach your inverter from outside your home network by mapping an external port on your router to the inverter’s internal address.

• Inverters use port 8899
• EV Chargers use port 502

Port forwarding requires GivLocal Pro.

Setup

1. Assign your inverter a static IP or DHCP reservation in your router
2. In your router’s port forwarding settings, forward an external port to your inverter’s internal IP on port 8899 (or 502 for the EV Charger)
3. Find your home’s external IP address, or set up a dynamic DNS service for a stable hostname
4. Enable Port Forwarding in Settings → Remote Access
5. In GivLocal, long-press your device and tap Edit, then enter the remote address (e.g. myinverter.example.com:18899) in the Remote Address field

The app uses the local connection when your phone is on your home network, and automatically falls back to the remote address when it can’t reach the local IP.

Security

• Restrict access using your router’s firewall to only allow connections from known IP addresses
• Consider using a VPN (Tailscale) instead — it requires no open ports