Current transformers work with alternating electromagnetic fields generated and transmitted by 2 coils, a very old technology, but, solar panels generate direct current, converted to alternating current by electronic inverters, controlled and fed into the grid.
A current transformer (CT) is a type of transformer that is used to reduce or multiply an alternating current (AC).
https://en.wikipedia.org/wiki/Current_transformerA transformer … transfers electrical energy from one electrical circuit to another circuit, or multiple circuits. A varying current in any coil of the transformer produces a varying magnetic flux in the transformer's core, which induces a varying electromotive force (EMF) across any other coils wound around the same core.
https://en.wikipedia.org/wiki/TransformerA power inverter, inverter or invertor is a power electronic device or circuitry that changes direct current (DC) to alternating current (AC)
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Solar micro-inverters differ from conventional inverters, ... This can improve the overall efficiency of the system. The output from several micro-inverters is then combined and often fed to the electrical grid.
https://en.wikipedia.org/wiki/Power_inverter