1990 Force 50hp Alternator Question

[wisemsc]

I have tried searching the internet and this forum for a while, and I cannot find out how many amps the alternator in my motor generates. I have a 1990 force motor 50hp Model: 507X90D. I am re-building my 1990 Bayliner Capri and am in the process of designing my rebuild. I need to know the capacity of the alternator in order to determine how many accessories I can safely install with only the one battery system. The motor is currently in pieces, otherwise I would put a multi-meter on it and determine the output. Any ideas or at least places I can look to find out specifications?

 

[sea unt]

Re: 1990 Force 50hp Alternator Question

35.4 kw @ 5000 rpm Is what I have in my manual.

 

[wisemsc]

Re: 1990 Force 50hp Alternator Question

Thanks! What manual do you have? I still need to get one, but didn't want to get one that was too generic.
Also, it has been a while since I studied the principles of electricity and I am working on refreshing my understanding of ohms, amps, and volts, but 35.4 kilowatts seems quite massive for that small of an engine. I am trying to figure out what pieces of information I need to plan out how large of a battery I need and how many accessories I can add based on their Wattage and Amp requirements before I start to draw down the battery.
Thanks again.

 

[wisemsc]

Re: 1990 Force 50hp Alternator Question

35.4 kw @ 5000 rpm Is what I have in my manual.

After doing a bit more research, I think the 35.4kw @5000 rpm refers to the engine power and not the alternator because 35.4 KW is equivalent to 46.936 HP.

 

[Jiggz]

Re: 1990 Force 50hp Alternator Question

35.4 kw @ 5000 rpm Is what I have in my manual.

That's one big heck of an alternator. 35.4 KW is the power rating of the entire engine which equates to 50 HP. The alternator or stator output is only a mere 7.5 amps at 12V which is equal to 90 watts.

 

[wisemsc]

Re: 1990 Force 50hp Alternator Question

Thanks Jiggz! That will give me a good starting point. I am looking at buying "The 12 Volt Bible", by Miner K Brotherton and Ed Sherman to help me with my electrical design.

 

[sea unt]

Re: 1990 Force 50hp Alternator Question

After doing a bit more research, I think the 35.4kw @5000 rpm refers to the engine power and not the alternator because 35.4 KW is equivalent to 46.936 HP.

Oops sorry my bad your right. 7.5 kw is correct unless the previous owner upgraded. You should be able to test with a meter and the help of the bible. I grabbed an owners manual on ebay. It is a 35 to 50 hp models from 88 to 91.