The shunt spec is absolutely critical — @Stu1991's spot on there. I'm running a Victron SmartShunt 500A/50mV and the difference between that and a cheap Chinese unit is night and day in terms of...
I'd push back slightly on ModBus TCP being the starting point though. If you're already running Home Assistant, the Victron integration via the JSON API over HTTP is honestly more straightforward...
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