Lets see if I have this right. Prices are just WAGs (Wild *ss Guess)
You sell solar power @ .10/KWHr
You buy grid power @ .15/KWHr
You can buy local solar power for .12/KWHr
You want to buy the .12 power when there is enough of an excess to power up your optional load. Correct?
What you are asking for is how to determine automatically when the property is producing excess power. Correct?
Sounds like you need the equivalent of a reverse power relay to tell you when the power is flowing out of the property.
Close... the actual figures are about:
sell solar power for 60cents kwh
buy grid power for 20cents
buy local power for 6 cents (generation portion of grid power)
And yes don't think too hard, it's a 'game', but hey that's the way it is.
So correct, they want to buy the 6cent power when there is enough available, preferably automatically so they don't have to watch the meter and flip a switch when there is excess...and if something varies (i.e. a cloud goes over the solar or the stove is turned on) they aren't buying the 20cent power for something optional.
