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Generators In this forum we will try to answer any of your questions about the different model generators that can be found on Blue Bird coach's.

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  #1  
Old 11-28-2016
konehd konehd is offline
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Default Adding Alternator to Powertech Kubota 15KW Genset

Ive wanted to do this for a while...

Some of the '90's coaches did not have a 12v DC alternator on the kubota engine. Ive been looking for a while for one that would fit, and finally got around to finding one.

This fits perfectly!
http://www.ebay.com/itm/130821972571...%3AMEBIDX%3AIT

Rated at 45 amps, and thats about what it puts out.

This gives some more current for the batteries and the DC radiator fan I installed.

Install was easy, but some of the cooling plumbing had to be relocated, you can see in the photos that the large 1.5" hose just under the alternator had to be extended, the 3/4" pipe from the thermostat had to be extended and I put a new hose on the header tank.
The only issue I ran into was one of the thermostat bolts broke off ;{ Had to drill it out.

I hooked the output to the starter feed, that goes to the coach batteries, and the excitation to the oil pressure switch. I left the lamp circuit open... See the diagram...

This puts out 40-45 amps while the gen is running 1800 rpm.

Only problem is this runs toasty hot! Too hot to hold your had on it. Not sure if thats OK or not. It is putting out rated current, but my IR thermometer says its over 200 deg. Thats HOT!

Any ideas if thats ok??


Thanks, Joe
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Old 11-28-2016
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brhodes brhodes is offline
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Joe,
What was the fan belt number you used for the alternator?
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Old 11-28-2016
konehd konehd is offline
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Same one fit OK...


/Joe
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Old 11-28-2016
Don & Kitty Bartlett Don & Kitty Bartlett is offline
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Hi Joe. Nice idea, have thought of doing the same ever since you first posted about it. I wouldn't expect a long life out of that puppy at 200 deg. with no air for cooling ( no fan up front of the engine),,, maybe you can come up with an extra DC cooling fan for the Alt,,, Kind of self defeating??? Say Hi to pat for Kitty and me. Don
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Old 11-28-2016
markusfmeyer markusfmeyer is offline
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Joe, here is my thinking. That alternator looks stuffed in there. No room to breathe, and right up against the radiator. I'm guessing the alternator is taking on the temperature of the radiator. I wouldn't want mine running at 200 degrees, isn't going to last long like that.
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Old 11-28-2016
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Randy Dupree Randy Dupree is offline
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i have had 2 LXIs with an alternator on them from factory,never had a failure yet.
They are both mounted just like Joes.
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Old 11-28-2016
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Think about the alternator mounted on your car/truck engine behind the radiator next to a modern engine running at 200 degrees putting out an average of 65 amps and how long do they last?

Creating DC current from an AC alternator creates heat.

Should be OK.
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Old 11-28-2016
hexspeed hexspeed is offline
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From one of the larger custom builders of ultra high watt car sound systems:

"Alternators aren't "hot" until they leave blisters the second you touch them. :-) That said, normal operating temps underhood will usually be in the 190-230 range depending on ambient air temp, but can go higher of course. We routinely push them well over 300 on the bench in testing. Most alts will go into thermal shutdown completely over about 310 or so, but will start full temp compensation about 255-260. In short, if it wasn't smoking or leaving blisters, it wasn't too hot."

I was surprised alternators can run that hot. Guess that's why some of the larger BB ones are oil cooled.
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Old 11-29-2016
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Curious, does your alt have a NEMA rating? --they rate alts by duty cycle and max temp. Brochure attached.
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File Type: pdf is_55_alternator_temp_rise_v1.pdf (883.8 KB, 1358 views)
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  #10  
Old 11-29-2016
markusfmeyer markusfmeyer is offline
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Quote:
Originally Posted by brhodes View Post
Think about the alternator mounted on your car/truck engine behind the radiator next to a modern engine running at 200 degrees putting out an average of 65 amps and how long do they last?

Creating DC current from an AC alternator creates heat.

Should be OK.
That's exactly what I was thinking about. There are several differences though at least that I could see. In my truck, the alternator isn't mounted within an inch or two of the radiator. Second, there is a fan behind the radiator helping to cool things down. Third, there is airflow coming in thru the grille cooling things down. Fourth, there is space around my alternator allowing airflow. I also thought about cars I know where the regular models came with a 4 or 6 cylinder engine, and optionally an 8 cylinder. More temperature/cooling issues with the 8s stuffed into that same space, often requiring custom radiators and/or fans to do the job.
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