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Onan Generators Restoring, operating and maintaining vintage Onan generators.

Onan Generators

Onan generators 1 phase vs 3 phase


Some Onan generators that are rated for 20KW on 3 phase are only rated to 13KW on 1 phase, yet...

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  #161  
Old 03-01-2013, 05:53 PM
Jack Hottel Jack Hottel is offline
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Default Re: Onan generators 1 phase vs 3 phase

Talk to your friendly electrician. He will likely have a rotary hammer with an adapter to drive ground rods. Pretty tough to drive them around here so they usually drive them at around 45 degrees. I imagine the hammer and adapter can be rented also.
Jack Hottel
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  #162  
Old 03-01-2013, 05:59 PM
Louis L. Howard Louis L. Howard is offline
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Default Re: Onan generators 1 phase vs 3 phase

do NOT buy a single phase generator. research this , or talk to a competant Master Electrician who knows the difference. single phase power is available from a 3 phase unit , but not the other way around. 3 phase motors, eg
Air Cond units, are much cheaper to operate than single phase units. dont believe misguided salesman. the power company produces 3 phase, so does the alternator on your car, because it is the most effecient. Louis
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  #163  
Old 03-01-2013, 07:32 PM
Ed Sparks Ed Sparks is online now
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Default Re: Onan generators 1 phase vs 3 phase

Your right Max. Modern ground rods are steel core. My two recently installed ones are. When the electrician installed my new service entrance they weren't happy with the original two which are very shallow driven in horizontally. They poked around and found a spot about ten feet out in the yard where there is a little over a foot of soil. All four are tied together as a ground buss with 4-0 copper stranded.
The two original ones for service entrance are solid copper.Can only imagine what they are worth in scrap value if someone could figure out how to pull them out.

Ted: The well casing can be used if it's at least a full length . When we working on a new home on a small 2 acre island with no soil they welded a lug on the side of the casing and bolted the ground to it.
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  #164  
Old 03-01-2013, 08:13 PM
reybo reybo is offline
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Default Re: Onan generators 1 phase vs 3 phase

Quote:
Originally Posted by Jack Hottel View Post
Talk to your friendly electrician. He will likely have a rotary hammer with an adapter to drive ground rods. Pretty tough to drive them around here so they usually drive them at around 45 degrees. I imagine the hammer and adapter can be rented also.
Jack Hottel
We're putting this in the busiest underground area we have. Within a 6' x 6' area there's underground tubing with telephone lines installed in 1953 and re-pulled in 1985; underground power installed in 1953, by-passed with a new overhead in 1973, and that replaced by new underground laid in 1998; underground Comcast same trench; underground old and new water supply.

That old, unused 1953 power conduit is 2." It goes from outside the garage 80" to the base of a utility pole where it terminates a few inches above ground. May not be copper, gold, or silver, but it sure would make a good ground.
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  #165  
Old 03-02-2013, 05:43 PM
Louis L. Howard Louis L. Howard is offline
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Default Re: Onan generators 1 phase vs 3 phase

the well casing can be and should be connected to the ground network-Louis
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  #166  
Old 03-03-2013, 01:40 AM
reybo reybo is offline
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Default Re: Onan generators 1 phase vs 3 phase

Quote:
Originally Posted by Louis L. Howard View Post
do NOT buy a single phase generator. Louis
Specifications of mine: 3 Phase 120/208V - 104Amps, 1 (SINGLE) Phase (Same as residential) 110/240V - 52 Amps, 1 Phase 120V - 34.7 Amps
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  #167  
Old 03-03-2013, 10:05 AM
John Ward John Ward is offline
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Default Re: Onan generators 1 phase vs 3 phase

In all my years as an HVAC tech I have only come across one house that had three phase power in it. The prior owner was a big wheel with the power company so he made it happen. Pulling up and seeing two transformers on pole had me scratching my head until I heard the reason why.
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  #168  
Old 03-03-2013, 10:16 AM
Ed Sparks Ed Sparks is online now
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Default Re: Onan generators 1 phase vs 3 phase

When we lived down in Mass, we had three phase service to the two family house & garage. It was in an industrial neighborhood and the former owner had a small machine shop set up in garage & basement.
He had gotten most of his machinery from the old Springfield Armory plant which was 3 phase.
It was easier to leave it than change everything out.
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  #169  
Old 03-03-2013, 10:25 AM
John Ward John Ward is offline
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Default Re: Onan generators 1 phase vs 3 phase

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Originally Posted by Ed Sparks View Post
When we lived down in Mass, we had three phase service to the two family house & garage. It was in an industrial neighborhood and the former owner had a small machine shop set up in garage & basement.
He had gotten most of his machinery from the old Springfield Armory plant which was 3 phase.
It was easier to leave it than change everything out.
My kind of place.
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  #170  
Old 03-06-2013, 09:52 PM
Spridle Spridle is offline
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Default Re: Onan generators 1 phase vs 3 phase

wow am I confused! Diesel military gen was not where I thought this thread was going! I'm sure it will be a hell of a gen for you, just surprised at the hard right turn from a NAT gen.
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  #171  
Old 03-07-2013, 06:04 PM
reybo reybo is offline
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Default Re: Onan generators 1 phase vs 3 phase

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wow am I confused! Diesel military gen was not where I thought this thread was going! I'm sure it will be a hell of a gen for you, just surprised at the hard right turn from a NAT gen.
The more I read here, the more promising became the mil diesel. And dare I say it, the more interesting.

Lost power to heavy snow Wednesday and was lucky to get a room for $200 a night so we could keep the O2 machines humming. And that's when only half the area was without. A broader blackout, like losing the grid in central Virginia, and we'd be up the creek.
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  #172  
Old 03-07-2013, 06:32 PM
Ed Sparks Ed Sparks is online now
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Default Re: Onan generators 1 phase vs 3 phase

You have very expensive hotel rooms in your area.
Around here a nice best western or ramada is only $75-90 this time of year
Even at the peak of tourists season they only go up to $135-150.

My sister in law & her husband came up a couple weeks ago and spent the night at a nice Best Western with whirlpool tubs, swimming pool and health club,full breakfast in the AM and evening cocktail hour for $79.00 + tax.

We do have a couple of B+B's that charge $150 -200 in the peak summer season, but they are marketing to the wealthy out of staters .
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  #173  
Old 03-07-2013, 06:48 PM
reybo reybo is offline
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Default Re: Onan generators 1 phase vs 3 phase

Hotels do a lot of marketing to bring conventions here. The biggest and best were fully booked all week even without the power outage. The rest were quickly flooded with local families without power. No hotel here has stand-by power for the rooms, only the lobby and elevators. Doesn't do us any good.
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  #174  
Old 03-08-2013, 01:52 AM
Isaac-1 Isaac-1 is offline
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Default Re: Onan generators 1 phase vs 3 phase

Any ETA on the MEP-003a?
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  #175  
Old 03-08-2013, 10:32 AM
Graycenphil Graycenphil is offline
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Default Re: Onan generators 1 phase vs 3 phase

For the price of one night, you could buy a used 3600 rpm gas screamer, power the essentials, stay in your house and have a backup/portable generator.

For four nights at thae rate, you could buy a brand new Yamaha inverter.
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  #176  
Old 03-08-2013, 05:55 PM
reybo reybo is offline
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Default Re: Onan generators 1 phase vs 3 phase

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Any ETA on the MEP-003a?
Late next week ... maybe. Says a death in the family. If I had built this much window of delivery into the uship specs it would have saved $100 or more. C'est la vie.

On another matter, I had to reject every uship bid to bring my car from Milwaukee to Virginia. Seems specifying a week, 7 days, to make the delivery counts as a tight constraint driving up the cost. We're running a replacement uship auction for the car offering a 2-week delivery window.

The only delivery in hand so far is the pintle trailer hitch a farmer friend is storing at my place. Great piece of gear.
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  #177  
Old 03-12-2013, 11:30 PM
reybo reybo is offline
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Default Re: Onan generators 1 phase vs 3 phase

We finally have our generator sitting alongside the driveway. This 10Kw MEP-003A is in splendid shape. Evidently spent life under cover and was cared for. Trailer also in very good condition.

There is much to learn. For one thing, is there an interlock on the AC circuit breaker, the ganged triple switch to the right of the Reconnection Switch? When the gen's not running, this switch cannot be moved. It's locked in the OFF position. The manual says nothing about this.

Anyone familiar with it?
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  #178  
Old 03-13-2013, 08:16 AM
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Jim McIntyre Jim McIntyre is offline
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Default Re: Onan generators 1 phase vs 3 phase

Not me. Just FYI - there's a forum dedicated to military surplus/MEP gensets...
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  #179  
Old 03-13-2013, 01:35 PM
grif grif is offline
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Default Re: Onan generators 1 phase vs 3 phase

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Originally Posted by ted_cool View Post
Can the well casing be used as a ground rod?
Ohhhh,,, I need to share this one. The short answer is yes, just not sure of the inspectors answer.

On a Bible,,, I can't even begin to make stuff like this up...
New construction, dropping the pump down the 6" casing, wiring it. The install company guy grounds the well casing and I'm in hysterics. He looks at me,,, says, "I've been written up on this exact issue,,, I just ground them all".

Well casing was PVC. Trust your government.
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  #180  
Old 03-18-2013, 04:01 PM
saunD saunD is offline
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Default Re: Onan generators 1 phase vs 3 phase

Here is a great article that helped us when searching for our generators.. It distinguishes the difference between single phase and three phase and gives you a lot of information to deal with .. Hope this helps you as much as it did for us

http://www.norwall.com/blog/news-and...se-generators/
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