Hi, So I trialed a 400W grid tie inverter which I had laying about to experiment with lowering the amount of energy the house is drawing from the grid with a single 100W solar panel I have on the roof to charge some batteries. I have a "smart meter" which measures how much power the house is using. Its not the latest ones which send the results back to the supplier. It has a reader which clips round the 4th cable exiting the meter to the fuse box (I'm on a dual tarrif) which connects to a transmitter so that the receiver can be anywhere within 30 metres of it in the house. My question is, during a sunny day, I generate about 70 watts. The house uses 600watts all the time (I have a bitcoin miner which utilises 400 watts, and the fridge and freezer together total to 200. 400 + 200 = 600.) When I switch on my inverter, the meter rises to 670W. I thought it should drop 70W instead of increase? Unless the meter is adding the receiving power as well as consumption? Any ideas? Thanks, Owen.