Yun, if I'm not mistaken your model yr has updated fans. They are supposed to have totally sealed motors and have a higher rpm limit with redesigned blades to move a lot more air than the early fans ( 90 - 92 I think? I know 90 for sure! ). I still have my OEM set up & I keep meaning to go to vette recycling to get me the newer set up.
The only electrical knowledge I can offer up is on A/C circuits. UL & trade standards say that any circuit should only be loaded to 80% of the rated amp load at the breaker. That's a safety margin so when people make a birds nest at any duplex device ( outlet in non-electrician speak ) they don't pop the breaker and overheat the wire gauge ( as that isn't a good thing ). I do not know if this applies to DC circuits. I would figure that there has to be some load safety margin even in a DC circuit.
