Pull telemetry from a Victron Energy solar/battery system via the VRM API and MQTT
domain: vrmapi.victronenergy.com · 6 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Create a Victron account and confirm the installation (GX device/Venus OS system) is registered and visible in the VRM Portal
Generate a VRM Personal Access Token from the portal UI rather than using username/password login, and send it via the documented authorization header on REST calls
Call VRM API v2 endpoints to list installations and pull diagnostics or time-series widget data for a given site ID
For near-real-time data instead of polling, connect to the local Venus OS MQTT broker on the GX device (or Victron's cloud MQTT broker) and subscribe to N/<portal-id>/... topics
Publish a periodic keepalive to R/<portal-id>/keepalive listing the topics you want, since Venus OS stops publishing to a topic shortly after the last keepalive if no active subscriber is detected
To write/control values rather than just read them, publish to the parallel W/<portal-id>/... topic namespace
Known gotchas
MQTT data silently stops flowing if you don't maintain the keepalive publish to R/<id>/keepalive — a frequently reported 'why did my data stop updating' issue
The cloud REST API (historical/aggregated, rate-limited) and local/cloud MQTT (near-real-time device mirror) are separate, non-interchangeable data paths documented in different places
VRM API rate limits are real but not crisply published as one official number; Personal Access Tokens are recommended over username/password login to avoid token churn issues
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