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I've just purchased a almost new (2011) Yamaha 15 hp as a kicker for my Trophy and planned on setting it up with a rectifier and wiring to charge my batteries (either one or both through a Perko Switch). I had the same set up with my previous boat with a 6 hp Yamaha.
The difference between the two motors it the output. The 6 hp put out 6 amps max and the 15 hp puts out 10 amps max. These motors do not have regulators, so they can theoretically overcharge a battery. I never had an issue with the 6 hp because the output was so low. But, what I don't know is how much the 15 hp puts out at typical *****ing speeds. I plan to do that before next summer, but I'm wondering if I should just pre-emptively look for a way to introduce a voltage regulator into the system... or maybe a cutoff switch to just stop the electricity flow to the battery when I want to?
So, the question for anyone with a 15 hp Yamaha or maybe a 20 hp Yamaha, have you had overcharging problems? Have you measured the output at slow speeds?
Thanks!
The difference between the two motors it the output. The 6 hp put out 6 amps max and the 15 hp puts out 10 amps max. These motors do not have regulators, so they can theoretically overcharge a battery. I never had an issue with the 6 hp because the output was so low. But, what I don't know is how much the 15 hp puts out at typical *****ing speeds. I plan to do that before next summer, but I'm wondering if I should just pre-emptively look for a way to introduce a voltage regulator into the system... or maybe a cutoff switch to just stop the electricity flow to the battery when I want to?
So, the question for anyone with a 15 hp Yamaha or maybe a 20 hp Yamaha, have you had overcharging problems? Have you measured the output at slow speeds?
Thanks!
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