The alternator in question is a 6V 1.8W (0.3A) Sturmey Archer (Normally referred to as a "dynamo" in bicycle terminology).
Please can anyone direct me to any sources of info about matching loads to the impedance of an alternator?
Apparently the original equipment uses the precarious arrangement of using the front & rear bulbs to load the armature output to the specified voltage.
What I am intending to do is charge a 1.2Ah SLA battery, I'd like to know whether I can get more power from the alternator by allowing the output voltage to rise above the rated 6V by using a step down converter to reduce the current draw.
Any info on alternator characteristics & behaviour, or how to impedance match them might be useful.