Your drawing is not entirely consistent with your question. The answer is probably yes, but with some significant reservations. The normal way to monitor a system which includes power generation (whether PV, wind, or hydro) is to use a second main MTU and CTs to monitor generation. TED (when set up correctly) then does the necessary calculations so that numbers are appropriately added and/or subtracted to display Load, Generation, and 2-way flow to the Utility. Only a correctly configured CT attached directly to a MTU can correctly read and show bidirectional flow. Spyders assume that all their arms are measuring load. You can't have TED automatically subtract the reading of one Spyder arm from that of another, or from that of a main MTU CT. You would have to collect the data and do the mat yourself, after the fact,
As far as monitoring the load on a second panel goes, if your panels are as close together as you show them to be, you can probably run the leads from CTs on the input live wires of the 'secondary' panel to a Spyder attached to an MTU in the primary panel (the panel to which the PV system is attached). Problems are likely if you need to monitor breaker circuits with a Spyder attached to an MTU mounted in one panel from an ECC plugged into a circuit that is fed from a different panel.
