OK. I am starting my research with PV (solar) inverters/chargers that work offline (meaning no cloud, no internet needed, LAN (local network) is fine) but not off-grid :) I hear good things about the Victron Multiplus series that seem to work that way: https://www.victronenergy.com/inverters-chargers/multiplus-12v-24v-48v-800va-3kva and the Multi-RS Solar that adds MPPT: https://www.victronenergy.com/inverters-chargers/multi-rs-solar@[email protected]
@fedihouse If you know (from experience) about similar devices that charge and feed power without phoning home all the time, feel free to add them to this thread. I will collect them on a page at https://fedihouse.eu
Fedihouse

Fedihouse β€” upcycling houses with a Fediverse approach. Open Source, Open Hardware, Renewables, Accessibility. Sharing experiences, knowledge, lessons learned and new ideas.

Anker SOLIX BP3800 Expansion Battery - 3840Wh LFP (For F3800)

3,840Wh Long-Lasting LFP Battery Seamless Expansion for Anker SOLIX F3800 3,000 Life Cycles and 10-Year Lifespan 5-Year Hassle-Free Warranty

Anker