If logging to emoncms.org cloud service, is the emonTx V4 with Onboard WiFi and a bunch of current clamps all that is needed?
No need for the emonBase 433Mhz etc?
Yes I think so - @Gwil might be able to confirm.
Yes, that is correct: if you choose the WiFi option there is no need for an emonBase in order to send data to Emoncms.org (or your own server). You just need reliable WiFi at the Tx’s location.
An emonVs is more than just a power supply for the Tx, it provides a voltage reference which is important for accurate power readings.