It actually sounds like a great idea, but I don’t think that type of system exists as you described. Probably because it wouldn’t benefit the electric utility companies directly. I’m wondering if you did manage to make your own system like that if the POCO would even let you interconnect it to their grid system without their approval.
It exists and has been connected and working for a couple years now. As someone said, they have just been manually guessing...sunny day run the dryer or hot tub, etc.
As far as setup...Im not good at describing but here goes.
High voltage from road to pole transformer/pole (utility owned). Secondary of transformer has like 3 feet of wire then connects to the 2 "services", the "load" going underground to the disconnect in the shop, the "generation" to a meter on the pole and to its disconnect in the shop. The CT for the bidirectional meter is on that 3 feet beside the transformer, the CT wires run down the pole to the meter. So I would have to go up the pole within about a foot of the transformer with my CTs to get a net reading that way. Not happening.
I came across a watt transducer called Wattnode
http://www.ccontrolsys.comWas thinking of using one of these with a pair of CTs by each disconnect to get a pulse output (equivalent to watts).
Then I would need a instrument that can use those two pulses, combine them and give a relay output based on my settings.
Any ideas?
Im looking at a programmable relay BB Electronics TECO SG2
http://www.bb-elec.com/product_multi_family.asp?MultiFamilyId=39&Trail=158&TrailType=MainNot sure if it suites...probably fancier than needed anyway.
