Hillhater wrote: ↑
Nov 23, 2017 9:50 pm
Will my "feed back" power go any further than that sub station , being redistributed on the local lines to my neighbours, or is there some mechanism for pushing my keen little kWs back past the substation, up to experience some National travel to far away places ?
A few notes on this issue:
1) On a physical level your electrons aren't going anywhere. A 100 amp load will cause electrons to move a few millimeters per second in a copper wire. (And since the current reverses 120 times a second, those electrons never really go anywhere.) But what you are creating is potential; you are pumping electrons into that wire and that raises the potential of the wire, and that potential can force electrons out of the wire in other places. (Like your neighbors.)
2) That potential can be used by your neighbors, or by the whole grid. Distribution transformers are two-way, so any energy you generate can propagate through the grid. However, a simpler way of looking at it is that you are really powering the nearest loads. (And via an accurate analysis, slightly more current ends up in local loads than in the grid as a whole, since the effective impedance is lower to those loads.)
3) Although the grid is bidirectional, many grids cannot sense bidirectional current - and thus cannot control the grid once the current reverses. This is a problem with subgrids like Hawaii where there is so much solar installed that the current starts flowing back through the distro transformers to the larger grid. (Which is why new installations in Hawaii are currently prohibited.) Upgrades under the general heading of "smart grids" can avoid this problem.