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An alternative to multiple current transformers would be to measure the voltage as well as the current. Doing this means you can save money by not using multiple CTs while still being able to determine whether you are pulling current from the grid or feeding current to the grid. It has the added advantage of also giving accurate results when you are running inductive loads (such as a washing machine or heat pump). The downside is that it is a little more complicated as noted above. Here is an explanation for one that I use on a home with solar panels. https://openenergymonitor.org/emon/buildingblocks/...
Web-Enabled Home Thermostat...View Instructable »
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