First off: I'm German, and while I have a bit of knowledge of electrical distribution systems, I am not too experienced with English terminology for the technical terms. So please bear with me. Also: I'm talking about a 380 V / 230 V TN-C-S distribution system which three phases into the house and electricity meter and a single phase to each outlet.
There are small photovoltaic cells on the market currently which deliver around 400 to 800 W peak and are intended to be plugged into a (modified / strengthened) 230 V outlet. The energy is, ideally, directly consumed within the same household.
However, I was wondering how the electricity meter sees this. I have a bi-directionally-aware electronic meter that can measure current flowing in both directions independently (which is required for tax purposes in Germany).
Say I connect the solar cells to L1, producing 800 W, and have my washing machine on L2, drawing 2 kW. This creates a "Schieflast" (asymmetric / unbalanced load) on the net. Does my meter count the 1200 W net power I pull from the grid (how?) or something else? How does the balancing of currents work in this scenario?