Have been watching recent advice with interest. Took a deep breath and attempted to improve my push settings.
with the &v6=voltage_AC_phase_1 on end of meter push I can now see voltage. So that’s all good.
I had &nodayenergy=1 on the inverter push. Checked the software version - it’s 3.10.2-1 - so changed it to &dayenergy=1. immediately started getting zero readings with occasional peaks. Left it running for a couple of hours but problem persisted. So I’ve changed it back.
Am I misunderstanding the inverter setting somehow?