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Originally Posted by skeleton
Hey John,
Thanks for doing the test for us to benefit.
I want to know how much power is available for accessories under stock conditions. I don't have a dual-light mod - just a stock setup. Have I interpretted your data correctly, as it might pertain to us "stock" guys:
a) Minimum demand taken by FZ6 while running with stock setup (low beam):
12.2V, 15A = 183 W
b) Charging capacity of alternator above 2200 rpm:
14.0V, 22A = 308 W
c) Thus, power available to accessories:
308 - 183 = 125 W
d) Thus, current available to accessories:
(125 W) / (14.0 V) = 9 A
Note, this is not consistent with your #3 conclusions, which would suggest for a stock bike:
e) (45 W) + ((18-15 A) * (14 V) = 87 W .. (Compare with my #c)
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Well...I think that I haven't made something clear. At a point between about 1100 and 1500 RPM the battery transistions from discharge to charge. It was very difficult to hold the engine speed steady enough to look at 2 different ammeters and get a precise value for each. However it is clear that the regulator output quickly rose just off of idle and maxed out @2200 RPM. With the engine speed above 2200 I operated high beams, 4-way flashers and brake lights. Voltage dipped somewhat (I didn't write down the value) but alternator output was a CONSTANT 22A.
Remember all of my measurements at the fuse block include 55W additonal load of the dual headlight mod even at low beam. And, I stayed low with my estimate of available wattage because of variations due to heat, battery health, manufacturing tolerances and contact between terminals at various points. As they say, YMMV!
If needed I could make another load test at the fuse block to get current readings with different loads. However I don't believe that the regulator output needs to be retraced as it has a definitive peak.
BTW, thanks to all for the kind words. I try to give back some of what I have taken from this board.