Update on voltage discrepancy issue: we just deployed a fix. Please read on for more details.

We did indeed find a voltage calibration problem in our production process. We conduct a careful calibration and QA step for every monitor we produce, but had an error in the reference for the voltage part of the calibration. We first suspected something was wrong with the reference itself, but found it was actually correct. The problem was that in our factory setup we had an unexpected voltage change between the point where the reference was measured and where the Sense monitors were being powered for the test.

We are making changes to our calibration and testing in the factory for future monitors (and adding more post-production QA steps). And, the reference error was constant so we’re now deploying a software update for existing monitors to correct this.

The release should correct any places in the app that display wattage or voltage both in any real-time and historical views. Please let us know if you are still seeing discrepancies, so we can work together to resolve them.