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Onan vs. Northern Lights

 
 
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Old 10-06-2007, 10:03 PM   #1 (permalink)
balboa
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Onan vs. Northern Lights

We need 2 generators in the 55-65 KW power range (50 Hz, continuous duty).

We're looking at the above 2 brands. Any comments on either brands would be welcome. Suggestions on other alternatives are also welcome.

Thorwald
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Old 10-06-2007, 11:49 PM   #2 (permalink)
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Northern Lights

Northern Lights and Onan are great products. The most important factor is proper sizing. Frequent light and no loading will destroy any diesel. The most common complaint in the industry is misguided sizing that lead to glazed pistons that put a sheen of diesel on the water. Light loading leads to no compression and a dead machine. You may consider a third generator as a night genertator. You may consider a load bank to keep a load during light load periods. Sizing generators is not complicated subject. Load them hard in the first fifty hours and run them hard as often as you can after that. Its a simple formula that is so often not honored. Any diesel is destroyed by light loading. My portable load bank is great for break - ins and reseating rings.
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Old 10-07-2007, 12:02 AM   #3 (permalink)
balboa
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sizing gen sets

Thanks again for the comment. Yes, I'm very much aware of the load factor issue.

In fact, I had planned a 40-50 KW and 65 KW gen set but my electrical engineer said that for paralel running, different size gen. sets may bring trouble.

We need one 65 KW generator to meet class requirements but our 3rd gen. set could be smaller.

What's your take on this?

Thorwald
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Old 10-07-2007, 12:39 AM   #4 (permalink)
balboa
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load bank

I guess that another way to create some load would be get the airconditioning running harder when the generator load gets below 50%.

Instead of 'destroying' energy, at least we'd keep things cool and dry.

Thorwald
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Old 10-07-2007, 09:09 AM   #5 (permalink)
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paralleling

Paralleling different size generators is done often. The issue is pairing windings skew. An easy engineering issue.
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Old 10-07-2007, 12:37 PM   #6 (permalink)
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generators parallel

That's very good new$!

Thanks
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Old 10-08-2007, 09:26 AM   #7 (permalink)
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Before you spend your hard earned cash take a look at this. http://www.ossapowerlite.com/product...generators.htm

Comparisons are at the foot of the page.

First Pericles
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Old 10-08-2007, 10:34 AM   #8 (permalink)
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Hi,

Nothing is truly free in life or electrical generation.

These OSSA Engines claim massive savings in weight and size that is really quite hard to believe is accurate or substantiated by actual models in service.

There is also no mention of any type of Classification Society testing and or approvals.
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Old 10-08-2007, 12:26 PM   #9 (permalink)
balboa
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Ossa generators

Quote:
Originally Posted by K1W1
Hi,

Nothing is truly free in life or electrical generation.

These OSSA Engines claim massive savings in weight and size that is really quite hard to believe is accurate or substantiated by actual models in service.

There is also no mention of any type of Classification Society testing and or approvals.
Yes, those were my thoughts too. The page with installations shows mostly artist impresssions and I didn't see a worldwide distributor system. Space is not really an issue.

I do like the common rail, however, and wished other manufacturers would start using it.
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Old 10-08-2007, 12:42 PM   #10 (permalink)
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Hi,

Quote:
Originally Posted by First Pericles
Before you spend your hard earned cash take a look at this. http://www.ossapowerlite.com/product...generators.htm

Comparisons are at the foot of the page.

First Pericles
.

Interesting.

Just a few questions:

1. Spare parts ? Or it will be "better to purchase a new one than to find any spares" ?
2. Reliability. It whould be great to talk to someone, who used them for some time (5-10 years)...
3. Class approvals.
4. Fuel savings (as per i-net site). Where is the point ? (the point is the "B" (as per information in "Tech library - Fuel savings" tab),but some curves and statements are questionable.

I would install follow brands as auxillaries:
1. Scania
2. Volvo-Penta
3. Mitsubishi
4. Cummins

Regards,

Andrei
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Old 10-09-2007, 02:17 AM   #11 (permalink)
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Gentlemen,

Your reticence is understandable, but I have spoken with Ossa and they do have units in service. http://www.ossapowerlite.com/customer.htm

They are part of http://www.glacierbay.com/ and will be at Annapolis. They offer a new system to power boats, components of which can be incorporated in readiness for the future.

As with all things "new" can be a discouraging concept, but I guess diesels had their detractors at some time. In this case, something better, this way comes.

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Old 11-24-2007, 09:02 PM   #12 (permalink)
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Quote:
Originally Posted by balboa
We need 2 generators in the 55-65 KW power range (50 Hz, continuous duty).

We're looking at the above 2 brands. Any comments on either brands would be welcome. Suggestions on other alternatives are also welcome.

Thorwald
Up until recently Onan has always been considered crude in comparison to Northern Lights, they were always noisier, didn't run as smoothly, made less stout, engines didn't last as long, and cheaper. The new electronic series is starting to change my mind on them after running several. They run much quieter, nicer and so forth and so on. But also more complicated with sensors and so forth. I definately feel they have surpassed Westerbeke and that the Westerbekes are pretty crude running nowadays in comparision.

I also have experience with a 16kw Northern lights and it always ran great and also a few 55kw northern lights. Both ran very smooth, were very very simple to work on, very quiet, used very few wear parts, were designed to go many many thousand hours. Northern lights would still be my first choice given a fresh install and space limitations.
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