Heated gear

So, first day it was in the high 30's for a high temp. And windy. Cloudy. I had my heated gear on, and it got me wondering about the charging system. Looks like it puts out 400 watts? I'm wondering if anybody ever had a problem with fried stator windings or anything running a lot of heated gear. I had on my heated jacket liner, heated gloves, heated pants liner, and the heated grips. I have socks I want to use too when it gets cold enough. I want to ride as long as I can into the winter. before the roads get salty. Didn't really need all that on. I just wanted to take it all for a test ride and see how it all worked. Some are pretty old. (pant liner)

Look at your heated gear to see watt draw. Add them up, then add in your lights and ignition draw. What else ? If using heated gloves is it needed to use heated grips ?