Thanks for the detailed and educational post on the meters, I had no idea. I used the same meter, though, to read the change from 227v to 240v. Also, my 227v reading went back up to 240v if I removed the load. The sag was caused by the power load and heat from summer. Winter temps are definitely helping right now.
No utility sets a transformer for 220v, they're all set to 240v. If by voltage coming into the neighbourhood you mean the top most wire bare (or 3 wires if 3 phase is available in your area) it's neither 240v nor 480v. In fact, quite far from it. Those lines run at 12200v or 14400v generally, and are transformed to 240v before they enter your property. When you read 208v on 3 phase, that's quite normal. 3 phase systems in the low volt range are 120v/208v, not 220v or 240v.
Oh, don't forget that your 1210w figure depends on a PSU with 93% efficiency. 2880w are no where near 93% efficient according to the tests I did. (measured DC output vs AC input) Not a good way to calculate your voltage.
Thanks for the reply. Sounds interesting. I'm wondering if the 220 I'm suspecting is after voltage drop across the 2880W PSU with a load on it when I do the math?
