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Prévision PV, « Et un optimiseur ? » : le protocole existe et est publié, la connexion est en test (« en cours de développement » n'était plus exact) ; lien vers la section. FAQ, open source : « socle (powersync-core) », ancien nom, devient le moteur d'énergie (etm-powersync-energy-plugin-etm) ; protocole ouvert, optimiseur de référence et suite de conformité mentionnés. Accueil : liens vers « Comment le moteur décide » et la section Optimiseur. Trois langues. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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FAQ
Stub — frequently asked questions.
Does ETM PowerSync send my data to the cloud?
No. Control runs locally, on the box, and keeps working without internet. The only
component that connects to the internet on its own is the OpenMeteo weather plugin: it
sends only the site's coordinates (rounded to about 1 km from plugin version 1.15.2+etm2; version etm1 in the testing channel sends them unrounded), its altitude and the
orientation of the panels. Measurements, consumption and the tariff stay with you.
Remote access is disabled by default; it opens only if you enable it yourself in the
app. That is an architectural decision, not an option.
Is the project open source?
The energy engine (etm-powersync-energy-plugin-etm) and the plugins are under
GPL-3.0, including the optimiser client built into the engine — everything linked against
nymea is. The engine works on its own, without an optimiser. The
protocol between the engine and an optimiser is open and
published, with a free reference optimiser and a conformance suite: anyone can write their
own. The ETM optimiser and its business logic (tariff arbitration, forecasts learned
from your installation), however, are proprietary: they run in a separate process, reached
through that protocol, at your place — on the box or on a machine in your local network.
That process boundary is the heart of the Open Core model — the engine stays free, the
business logic stays proprietary.
What is the difference between Community and Pro?
Two editions, not three — the prediction layer has not been sold separately since 2026-10-14; it is part of Pro.
- Community — the GPL-3.0 foundation, self-hostable: deterministic rule-based control, solar surplus, load shedding, PV production forecast from physical models (beta, displayed, not used to decide), REST/MQTT API. No subscription.
- Pro — installed by ETM-Schurig: adds tariff arbitration and the prediction layer (production and consumption forecasts learned from your installation, heat-pump thermal inertia). No subscription either, and everything stays local.
Tariff arbitration and prediction are on the roadmap: the Open Core boundary already exists, the functions it separates are not all shipped. See etm-powersync.fr.