You should acquaint yourself with power distribution systems, auto stepping transformers, load variations and voltage tolerance etc.
Cameras only estimate WB and like the estimations they do for exposure will have errors when presented with unusual lighting conditions. It makes little difference how good programmers or their programs are if the initial value is incorrect.
A camera is not a device for measuring colour temperature or WB it merely takes what could be best described as an educated guess. No amount of precision in subsequent calculations will correct an incorrect initial value.