As per the title - does anyone know?
Depending on the quality of the core and the current needed for establishing the magnetic flux.
As an approximation, about 3-5% of the full load current. So about 50-80W. Some even bigger.
Thanks useful ballpark information.
Maybe I should have been more specific - what’s the no-load consumption of a Victron 200VA isolation transformer?
Depends on many factors: size, type (normal or toroidal), eddy currents loss, hysteresis loss, copper loss, etc.
Sometimes, even for the same type of transformer, among the ones getting out of the assembly line, could be differences.
For an exact value, just measure it… 