If power was my thingy, I would have a full blown crotch rocket. But, so long as it gets me down the road at 10-12 mph with good mileage, I am satisfied.
For last month, my 12v ac 6 watt bottle dynamo appears to be doing it's thing as to charging the 7 amp SLA battery with no problems. It started at 13-13.5 volts and still maintains that voltage. I have read that resulting rectified pulsating direct current, does a better job of charging a battery than a capacitor/regulated direct current.
So your using the rectifier between the dynamo and battery?
I'm like everyone else; I want to know if somethings going to work, or how it works before I start spending. You didn't state how long you've been running with a rectifier, and I'll admit I'm slightly weary of using something from radio shack on a motor vehicle, but I am motivated by both legalities, and the one night I was riding home from work on a long stretch of dark pot hole ridden street not knowing what was in front of me until it was to late.
I may have just wasted 28 bucks too, and I have to budget this hobby a bit at a time also. I may end up getting the rectifier after all.
This is what I found.
https://www.treatland.tv/trail-tech-voltage-regulator-p/trail-tech-regulator.htm