First time poster, short time lurker (thanks for opening registration back up).
I have been reading posts and learning about the IoTaWatt (have a TED6000 that isn’t working as intended and they don’t provide support anymore). I’ve also started reading up on the IoTaWatt manual.
I am planning on purchasing the IoTaWatt when it gets back in stock in the US and wanted to read both 120V legs that come into my home. What would I need to do to make that happen? (apologies for such a n00b question)
But not so fast. This is an old post where I tried to debunk most of the popular notions about split-phase:
In my own house I run a 240V Euro type VT and calibrate it down by half for a 120V reference.
What is it that compels you to want to do this? Virtually all IoTaWatt run with a single VT, even most of the three-phase installations, and the overall power monitoring is good. If you think you have some kind of huge imbalance or ground issue, maybe two 120V references would help to diagnose that, but the only way it will increase the accuracy of your most likely dominant 240V loads is if you use two CTs on each of them and assign each to their respective leg. A lot of trouble and expense for marginal, arguably insignificant improvement.
My recommendation would be to try the single 120V reference. If you don’t get satisfactory results, you can add another or better switch to a 240V reference.
I happened to search and read that post, very informative.
I had an issue a few years ago where we had a bad connection at the lugs underground (utility side, corroded) that was causing large voltage differences (up to 10 volts) when one leg was drawing energy. I thought it would be nice to see the other leg and compare it and watch out for something like that happening again. But if it does, I know what to look out for inside… So I’ll likely stick to your recommendation and add another if needed. Thanks!