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Yanmar Diesel Generator


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  #1  
Old 01-22-2018, 07:52:27 PM
doctle odd doctle odd is offline
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Default Yanmar Diesel Generator

Apologies if this is in the wrong section! I recently bought a small Yanmar diesel engine older model you have to put a drop of oil into for a cold start. I had an old Kohler generator I took the alternator off, brushless no brand 110 and 230v. It needed a new capacitor I replaced it with one of the same rating. Doing some tests the generator produced 252 volts at 3000 rpm. I slowed the engine and at 230 volts the engine speed is 2850 rpm. Does this sound right? Is there a higher no load voltage that settles down when a load is applied? Should I stick with the 230v or go back to the 3000 rpm? I don't want to connect anything and blow it up. Thanks
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Old 01-22-2018, 10:06:50 PM
Wayne 440 Wayne 440 is offline
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Default Re: Yanmar diesel generator

Is your set direct drive? In other words, the engine RPM equals the generator RPM?
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Old 01-23-2018, 08:45:06 AM
Joe Romas Joe Romas is offline
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Default Re: Yanmar Diesel Generator

Sounds normal to me.

Being in Ireland I "assume" you have 50 cycle power and 3000 rpm's is the correct speed for 50 htz.

I believe if you were to put a good size load, like a space heater that would not be damaged, on it the voltage would drop to around the desired 240V.

If not a cap of a slightly lower capacity will lower the voltage but since you replaced it with one of the correct value I believe it will not be necessary.
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Old 01-23-2018, 09:08:26 AM
I like oldstuff I like oldstuff is offline
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Default Re: Yanmar Diesel Generator

Get one of these. It will tell you the frequency that will allow you to set the rpm to get it at 50 hZ. Also quite handy to see what amount of power anything you connect to the gen is using. They're usually around 20 quid.

http://www.reuk.co.uk/wordpress/ener...y/kill-a-watt/
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Old 01-23-2018, 09:46:22 AM
doctle odd doctle odd is offline
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Default Re: Yanmar Diesel Generator

Thank you gentlemen! I noticed the sticker on the generator says 240 volts so its within the margin of error? Could I lower the voltage to 230 ish volts or would it be ok t0 use as is. I increased the revs to 2980 rpm its difficult to get it spot on with the diesel and its showing 242/245 volts on my multimeter with no load and 239/241 with a 400 watt load (halogen light). Ireland is nominally 230v but most of our electrical equipment, well the decent stuff anyway, comes from the UK which is 240v. The engine is coupled directly to the alternator. I dried the light, a pedestal fan and an jigsaw all things I could live without all seems fine. Thanks again

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Originally Posted by I like oldstuff View Post
Get one of these. It will tell you the frequency that will allow you to set the rpm to get it at 50 hZ. Also quite handy to see what amount of power anything you connect to the gen is using. They're usually around 20 quid.

http://www.reuk.co.uk/wordpress/ener...y/kill-a-watt/
I have one of those little laser things that measures rpm would this be more reliable? Thanks

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Is your set direct drive??
Yes its directly connected to the engine
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Old 01-23-2018, 09:48:51 AM
Joe Romas Joe Romas is offline
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Default Re: Yanmar Diesel Generator

What voltages does Ireland use?

In the US the standard is now 120 and 240 volts.
Long ago it was 110 and 220 and 115/230, it was raised in steps. Allowing the power company to supply more watts using higher voltage with the same size cables.

If you've got 230 then you should have half that or 115 on two legs.

Here's a recap of the changes made in the US.
https://www.quora.com/Is-the-power-s...-240-or-235VAC

Joe
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Old 01-23-2018, 10:04:36 AM
doctle odd doctle odd is offline
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Default Re: Yanmar Diesel Generator

I just checked my house voltage its fluctuating between 225/226 volts. Kettle, coffee machine, television etc say 220-240v. My capacitor is 20 uf however I know as much about electricity as I know about women so I have no clue how much further down the scale I'd need to get closer to 230v. I suppose I could just run the halogen light or a heater in the shed?
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Old 01-23-2018, 10:38:00 AM
Joe Romas Joe Romas is offline
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Default Re: Yanmar Diesel Generator

Maybe someone knows the formula and can help.
But depending on cost and availibility I would try moving down to 19 or 18uf. You can use a motor RUN, not START, cap as long as the voltage is at least that of your current one.
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Old 01-23-2018, 11:22:03 AM
doctle odd doctle odd is offline
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Default Re: Yanmar Diesel Generator

A decent quality alternator capacitor in Ireland costs about €40.00 so I would be quickly out the price of a new generator using trial and error
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Old 01-23-2018, 11:27:17 AM
Wayne 440 Wayne 440 is offline
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Default Re: Yanmar Diesel Generator

Quote:
Originally Posted by doctle odd View Post
...I increased the revs to 2980 rpm its difficult to get it spot on with the diesel and its showing 242/245 volts on my multimeter with no load and 239/241 with a 400 watt load (halogen light). Ireland is nominally 230v but most of our electrical equipment, well the decent stuff anyway, comes from the UK which is 240v....

My advice- use at your own risk of course- I would call it good enough, since "the decent stuff" is rated for 240V.
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