Steps

Confirm the inverter's local IP/hostname on the same LAN and, on newer GEN24 firmware, first enable the 'Solar API' option in the inverter's local web UI (older Symo-generation devices generally have it enabled by default).
Per the official 'Fronius Solar API V1' specification PDF published on fronius.com, call GET http://{inverter-ip}/solar_api/v1/GetPowerFlowRealtimeData.fcgi to read current site-level power flow (grid, PV, load, battery power).
Call GET http://{inverter-ip}/solar_api/v1/GetInverterRealtimeData.cgi with query parameters like Scope=Device&DeviceId=1&DataCollection=CommonInverterData to read real-time per-inverter data (AC/DC power, voltage, current, energy counters).
Poll these endpoints on a regular interval rather than opening a persistent connection — the Solar API is stateless request/response JSON over plain HTTP.
For multi-device installations, enumerate DeviceId values (or use Scope=System for an aggregate) to pull data per inverter/component individually.

Known gotchas

No API token/cloud authentication is required for these read-only local endpoints — access is controlled purely by local network reachability — but some newer GEN24 firmware ships with the Solar API toggle OFF by default, requiring a manual setting change first.
Modifying protected inverter settings (as opposed to reading realtime data) goes through a different, authenticated path — don't assume the same no-auth model applies beyond read-only realtime-data endpoints.
Endpoint file extensions are inconsistent (.cgi for GetInverterRealtimeData vs. .fcgi for GetPowerFlowRealtimeData) and must be matched exactly; consult the vendor's PDF spec for which DataCollection/Scope values are valid per inverter generation.

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Poll the Fronius Solar API locally on a GEN24/Symo inverter over HTTP to read real-time power flow and per-device inverter data.

Steps

Known gotchas

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