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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".

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Solakon One has a quite decent API you can control without cloud being involved...

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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.

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