Shelly 3EM-63T Gen3

The clamps are impressively accurate—I compared the readings against my utility meter over a week and they matched to within a few percent. The compact housing made it easy to fit into the crowded panel without fighting for space.

Set it up in the breaker panel in about 20 minutes, and the live power readings on the dashboard matched my utility meter almost exactly. For a three-phase monitor this compact, the accuracy and the fact that it handles up to 63 amps per phase is what sold me. Firmware update took a bit, but the who

The clamps on the CTs feel genuinely robust for a Gen3 unit—tightening them onto the busbar took real torque, which gives me confidence they won't loosen over time. I've got it wired up in my panel and the live readout updates fast enough that I can see the AC kick on in the app almost instantly.