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Author Topic:   Alternator output
Perry posted 02-11-2004 03:28 PM ET (US)   Profile for Perry   Send Email to Perry  
According to my manual, my outboard produces 16 amps. I assume this is at high RPM. My question is: does anyone know approx. what kind of output I get at trolling speed (2000-3000 RPM)?
Sal DiMercurio posted 02-11-2004 04:11 PM ET (US)     Profile for Sal DiMercurio  Send Email to Sal DiMercurio     
Trolling at 2000....3000 rpms ????????
Are you trolling for flying fish ?
If your engine is older, like 10 years old, at trolling speed [ 750 rpms ] your barely getting any charge out of the engine, like 1-2 amps.
The older charging systems have to turn over 3,000 rpms to even put out 10 amps.
Those charging systems weren't designed to charge the battery, only designed to maintain the charge thats in the battery & certainly not at trolling speed.
My 2000 ....200 hp puts out 35 amps even at idle.
What engine & what year is your engine.
Jerry Townsend posted 02-11-2004 04:31 PM ET (US)     Profile for Jerry Townsend  Send Email to Jerry Townsend     
Perry - with today's alternators, they are putting out rated voltage and a significant current slightly above idle speed. As such, at 2000 rpm, you are getting at least 12 volts and something shy of the rated 16 amp.

The newer alternators perform much, much better than the older generators and earlier alternators.

Incidently, my '96 115 Johnson idles at about 1000 - which lets me troll at about 1.5 - 2 mph - which is about right for the trout around here. In the ocean, I would suspect that you would be trolling a bit faster - and for some fish, a lot faster. ----- Jerry/Idaho

Perry posted 02-11-2004 06:06 PM ET (US)     Profile for Perry  Send Email to Perry     
Thanks for the input guys. I guess I should have said that the motor is a 2002 model 90 HP and I troll for ahi, (yellow fin), mahi mahi (dolphin), ono (wahoo) etc. Trolling speeds are 9 to 11 mph which equate to 2600 to 2800 RPM. When I troll for reef fish I usually go around 6 mph which is roughly around 2000 rpm.

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