Bonjour, Many Standards exist for Solar Power inverters
ANSI, NIST ASTM, IEEE, UL, NIST, IEEE, UL, SEMI, SAC, CENELEC and IEC, b
One paper on IEC std review.
http://proceedings.ises.org/paper/swc2011/swc2011-0401-Salas.pdfCurrent transformers are available in many ratings, for power monitoring.
Most are rated for mains freq but not rated for harmonics.
CT Ratio typically 10, 20, 50, 100, 1000:1
100 turn CT will generate 10 mA in the specified burden (load) resistor for each 1 A in the conductor under test.
https://www.electronics-tutorials.ws/transformer/current-transformer.htmlClamp on probes are less accurate and the airgap varies each clamp. Most are designed for a VOM /DVM.
Their freq response is worse, so harmonics are not accurate.
https://en.wikipedia.org/wiki/Current_clampA good quality solar inverter spec provides the harmonic content and regulatory/safety compliance.
Cheap (clones) may not comply or be unreliable/unsafe.
Jon