Moldmaker:
I want to dwell on this issue cuz I have some long tours coming up. I'll be running some heavy electrical accessories, but I don't want to kill the battery in the middle of the Yukon some cold and dark night. It still amazes me if our FZ6 can only offer about 56 Watts (see below) for accessories, with low beam only. Turn on the highbeam (55 Watts), and the system only has 1 Watt to spare - this doesn't make sense.
OK, I have rerun my summary with your clarification. This is what I have, with disappointing low surplus power/current for accessories. This gives around 56 Watts of reserve power:
-------------------------------------------------------------------------
a) Minimum demand taken by FZ6 while running with stock setup (low beam):
14.0V, 18A = 252 W
b) Charging capacity of alternator above 2200 rpm, with Highbeam (55 W):
14.0V, 22A = 308 W
c) Charging demand of highbeam
.......... = 55 W
d) Charging capacity of alternator above 2200 rpm, wout Highbeam (55 W):
(308 W) - ( 55 W) = 252 W
e) Current demand of stock FZ6 (with lowbeam only):
(252 W) / (14 V) = 18 A
f) Thus, power available to accessories:
308 - 252 = 56 W
g) Thus, current available to accessories:
( 56 W) / (14.0 V) = 4 A
-------------------------------------------------------------------------
Here are my total accessories. However I don't run them all at once:
Heated grips = Amps 30
Heated vest = Amps 35
Power adapter = Amps 5
Total Demand = Amps 70
It looks like heated grips and heated vest will overload the system, and cause an eventual battery discharge. (If these numbers are right?)
-------------------------------------------------------------------------
I have looked at another forum for the FZ1. Sure, that is a different bike but not too different. The FZ1's alternator can output 365 Watts compared to the FZ6's mere 308 Watts.
http://www.yamahafz1oa.com/forum/showthread.php?t=21204
Note: the attached chart is for the FZ1, not the FZ6 !!!
For a stock FZ1, reserve capacity = 197 Watts
If all the system components were the same betw both bikes, except the alternator's capacity, then extrapolation suggest:
For a stock FZ6, reserve capacity = 197 Watts + (308-365) = 140 Watts
Wow, this is way off from the predicted 56 Watts from earlier in this thread. I fear that this wide discrepancy suggests an error somewhere.