I believe the Tiger 800's max output is 645w and the 1050 is about 480w.
Someone had estimated the bikes use about 300w just going down the road.
Gloves or Liners=27w
Doubling these numbers for two fully heated riders would put the wattage needed at about 300w.
This could push the Tiger 1050 charging system beyond it's capacity.
Maybe somebody could check my numbers.