Hi Mick,
a good guide might be fuse sizes for the different areas on the bike?
Otherwise a split charger & spare battery on the top box?
Similar to yourself a very rough list / what I can think of:~
1) 2 x Ignition coils
2) Injection system / throttle bodies
3) Fuel Pump
4) Instrumentation
5) 2 x dipped beams (50w each?) 100W
6) 2 x indicators (21w each?) 42W
7) Rear Tail & Brake lights (5 / 21w?) 26W
8) Horn
9) Heated grips 48W
10) Heated vests 168W
11) Sat Nav (Should say on the back of the unit?)
Good luck, be interested to know what you find