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Some years ago I fitted an OWL power meter in my USRV when we were living in it full time .. as you say, useful for monitoring and not tripping the EHU ..
No install required, just a simple clamp over either Live or Neutral incoming supply cable.
Would I fit in my present campervan...?
No, not worth it, we rarely use EHU and when we do am savvy enough to know how may amps we are pulling with mental arithmetic.. it's not rocket science even for a non-electrical person.
myecohub.com
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No install required, just a simple clamp over either Live or Neutral incoming supply cable.
Would I fit in my present campervan...?
No, not worth it, we rarely use EHU and when we do am savvy enough to know how may amps we are pulling with mental arithmetic.. it's not rocket science even for a non-electrical person.

Owl + USB Electricity Monitor in realtime -myecohub
OWL + USB Electricity Monitor provides live electricity readingss. It shows your usage in power, cost, and CO² emissions.

You don't need to pay for this forum.. but these are the benefits ..
https://www.motorhomefacts.com/premium-membership/