Wawa:
CT (current transformer) is for AC. The "50Hz~200KHz" rating is a hint.
PV panels generate DC. Batteries are DC.
Try a hall sensor or shunt resistor.
Leo..
Sorry for not making it clear in the first place:
I want to install batteries on AC side (so can charge it from AC when electricity is cheap at night and from solar PV).
This requires use of CT clamps as on this image:
As clamps output current (not voltage) I suspect I might need an inverter circuit to convert DC to AC: http://www.theorycircuit.com/arduino-inverter-circuit/ - would this work? is this the simplest solution?