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Waking up an old thread again... I have a Renogy battery and was wondering if anyone had made progress? With regards to the device address, the linked document doesn't appear to state anywhere what defaults might be, but for "PDU"s you can apparently read and change it with the register at 0x1A...

I got an electricity meter with Modbus interface from eBay for a good price. I use an Arduino to interrogate this once per second to pulse width modulate the element of a vacuum flask kettle (1.8kW) to heat water with otherwise exported energy. This works so well that I decided to do the same...