The only time I’ve monitored the Utility incoming voltage was using an enterprise-grade APC UPS (as mentioned by others). I had it hooked it up with a serial cable and logging onto a computer which was part of a homebrew server farm. This was Lower Manhattan on the morning of August 13, 2003.
I stared at the graphs, as you do. Feel the power!
Sometime in the afternoon the APC relays starting clicking and the thing was going crazy beeping and generally letting me know I’d probably screwed something up. Oh boy.
Then boom, BLACKOUT.
I still feel some responsibility for what was supposedly the second most widespread blackout in history.
That said, yes indeed input voltage logging and graphing would be a very handy feature but at minimum (as discussed elsewhere on the forum) I’m still hoping for a pro-active max load watts ( = panel current overload) and min/max input voltage alert. This wouldn’t involve, I assume, any particularly complex GUI rebuild or backend complications. The hardware is already sufficient. At minimum it could simply be a universal non-adjustable alert that the input voltage is lower than a particular threshold or the load is approaching the 200A Sense CT max. For all we know this could already be a feature?
Related to that is my understanding that Utilities will often drop supply voltages at peak load (generally in a heat wave). It would be nice to be aware of when that happens … if nothing else it could be used as an alert to tweak the AC thermostat to avoid the guilt of causing the next blackout!
And a final thought: there are increased postings from eCar owners (congratulations!) and those with PowerWalls and other wonders … max current seems like a real possibility as does the Utility tweaking the supply voltage down more frequently that in times past.