Battery charging capabilities?

[Qwazert59]

I have a 15 MSH (15HP 2-stroke) and I read somewhere that there is a "kit" I can add to it that would allow me to charge a lead-acid battery while running.

Does anybody know if this is for real, and where I might find such a "kit"?

Thanks.

[boscoe99]

First, confirm that you model has a lighting coil. Which I think is the case. You should find two green wires coming from under the flywheel that are not connected to anything.

The kit you will need is 676-81970-01-00.

2014 Yamaha MRP Catalog

[Qwazert59]

That is correct...there are two green wires coming out from under the flywhel that are NOT connected to anything.

From the catalogue...they refer to this as a "rectifier kit" while "charge" kits are listed below. Will this rectifier kit provide a DC output to charge the battery for my *****ing motor, for instance?

[boscoe99]

The lighting coil will create AC voltage. The "rectifier" will convert that voltage to DC which can be fed to a battery.

Unregulated voltage by the way but the motor produces so little current that it won't matter.

Your motor has a lighting coil and the necessary flywheel to create voltage and current. The "charge" kit if you will note includes both a lighting coil and a flywheel which your model does not need.

[Qwazert59]

Thank you for your help.

[rodbolt17]

charging output is something like 5 amps at WOT and about 1 amp at idle.
almost not worth mucking with.

[boscoe99]

Maximum output for a 15MSH is indicated as 6 amps. At best.

But, small amps over time add up. It will charge a battery as long as you don't have anything connected to the battery that exceeds whatever current the motor can supply at a particular RPM.

Given that the motor is a manual start, for what purpose do you need to have it connected to a battery?

And keep all connections clean and tight. You can't afford any more voltage drop and current loss than would be normal since you are starting with so little.

[bajakeith]

running lights

they are not to be sold in the usa.. they are not to hook to a battery but for pwr running lights.. their sold and have seen in many parts of the world !!! sum you boys need to get out more often !!...LOL...Keith

[rodbolt17]

Baja.
yep I have done a few rectifier installations on them tiny mites.
why I dunno other than that's what the customer wanted.

for just lights you can simply hook up the wires.
you will see the lights dim and brighten with engine speed.
then its called A/C lighting.

I did talk one guy out of it. he wanted to charge his *****ing motor battery.
I explained to him that at WOT it only put out about 5 amps.
so you run to the fishing spot charging 5 amps for 30 min-1 hour. then you spend the next few hours drawing 25-30 amps out of that group 27 deep cycle.
do the math.

[boscoe99]

they are not to be sold in the usa.. they are not to hook to a battery but for pwr running lights.. their sold and have seen in many parts of the world !!! sum you boys need to get out more often !!...LOL...Keith

Why do you say this? Yamaha USA is selling them in the US.

2014 Yamaha MRP Catalog

You might want to get out and read up some more on what Yamaha is offering to US folks.

[rodbolt17]

an dem dar kits bin about for maybe fiteinn yrs or so?
please mr fox, don toss me in dat briar patch

and whatever you do, don't pee on my leg and try to tell me its raining.

[bajakeith]

running lights

hi boscoe,,I know that they were not to be sold in the usa market..maybe that has recently changed...Friday I'm working on a 28 boston conquest w/twin OXXY 250's (patrol vessel) and will ask the comador to ask the higher ups about this ?? I'm sure its still In the CFR'S...I have lived in Baja/mex for over 30 winters and learned about this by fluke !! and both of my DVM's are also FLUKE !! LOL/...Keith & the famous lil Tasha