A couple clarifications, first —
- Are you sure it’s not a 200Ah battery, rather than a 200A battery? Big difference, so just checking.
- What kind of MPPT charge controller are you using? Does it have a separate dc load connection to the inverter? If so, this is often the easiest place to measure as many charge controllers, like the Victron, have built-in power meters.
Just to clarify, CT clamps that are actual “current transformer” clamps i.e. with a ferrite-wrapped core do not work with dc current. Current clamps that use Hall Effect sensors, like in handheld multimeter clamps, do work with dc current.
You already linked to the esphome support, though note that both sensors output a serial stream over rs485 so you also need a proper uart converter for that. I wouldn’t recommend the 100-1000v unit with a 52v battery, however. There are a few topics on this forum about using the PZEM with esphome for solar monitoring.