FWIW, Sonreir is not trying to sell you his regulator, but his regulator is a very good value and works exactly how you need. I recommend his over the Kohler clones sold out there. I have a Kohler Clone that I replaced with Sonreir's R/R. While both regulate the voltage, Sonreir's has less internal resistance, so the output voltage is a little higher at low RPM, and the regulator also regulates to a little less voltage (A good) thing. Sonreir's is much less likely to boil off the electrolyte. It's a good unit. The Kohler Clone was 15.1 volts max, while sonreir's is about 13.8-13.9. A better point for our small batteries and especially for the Ion chemistry batteries. Ion chemistry batteries do not like high charging voltages. The batteries often melt or burn when over charged.