Re:Solar Balconies Take Europe by Storm
by adrianN on Thursday April 02, 2026 @12:20AM
(#47609943)
I have 2kW of panels on my balcony and 4kWh of batteries. I'm happy with the setup. I expect it to pay for itself in just a few years. The only thing I wish it had is open APIs to control the inverter and the batteries, ideally over bluetooth, so that I'm not forced to use an app.
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If port 502/TCP is open you can probably access it via Modbus protocol. Implementing a Modbus client is trivial.
My rebranded Fox ESS hardware has it enabled and there's even official documentation of the so-called "registers".
I use victron devices and a litime battery + an esp32 of your choice and some LLM magic to read and relay data from Bluetooth to web.
For both victron and litime plenty of examples exist, including home assistant integrations.