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Harking back to the electrical distribution discussion around #61 Free Destination Charging: 50x L2 80A Stations @ Caltech, Pasadena, CA and #86 Free Destination Charging: 50x L2 80A Stations @ Caltech, Pasadena, CA We're looking at putting in a managed multiple-charger installation at an...

My ethernet interface retrofit uses character recognition!

With mains/feeder metering, you could implement the algorithm I was talking about earlier .. that is, regulate the chargers based on total feeder current, even when non-EV loads (e.g. ventilation) come on autonomously. This is a feature I want to see in my multi-unit residential condo...

I see negative power readings...maybe CT's are installed with reverse polarity? Chuck

Does "communication circuit" apply to the Raspberry Pi etc in the Caltech charger boxes? If so, should there be a partition between the power wiring and the Raspberry Pi stuff, making it two separate compartments? I wonder what the NEC classification of the pilot wire circuit is (it shares the...

@McRat RE: 240V charging from 277V line: would a $200 buck/boost do the job? http://www.walmart.com/ip/ACME-ELECTRIC-T113073-Transformer-Buck-and-Boost-16-32V-1000VA/40830533

I love this. In fact I am inspired to build a smaller cooperative-charging system for my condo using similar hardware. @FlasherZ I am aiming to be squeaky clean on electrical code compliance. I can get a UL recognized version of OpenEVSE from Wattzilla & my electrical box internals will look a...