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A while back in the Firmware 1.22.1 thread (Firmware 1.22.1) I wrote about an unexpected power draw from my system when entering the peak period (TOU cost savings). What it looked like to me was that when entering the peak period the gateway would use the battery for the house load and push back to the grid everything the solar generated PLUS an amount from the battery equal to the house load. From Edison viewpoint, my credit during the peak was greater than what my solar alone could generate. From my viewpoint, it looked like the battery was being depleted twice as fast as expected.
Tesla finally came to the house earlier this week to diagnose the problem. Turned out to be a bad port on the Neurio energy monitor. He swapped out the Neurio and all is well. He said there's been reports of Neurio failures in the past.