Diesel gen

[passgas55]

I am pretty sure I got this link awhile back here in this section Tractorbynet.
Yanmar Powered 6,875 Watt Diesel Generator Does any one have this setup? I want this for my country home for power backup for storm season. I know the tank is small but I got a line on a 10gal aluim. tank. What you think? this is not for 24/7 operations but will be run for 3 to 4 hrs and down for 3 to 4 hrs. I got to find out how clean the power will be.

 

[JB4310]

I am pretty sure I got this link awhile back here in this section Tractorbynet.
Yanmar Powered 6,875 Watt Diesel Generator Does any one have this setup? I want this for my country home for power backup for storm season. I know the tank is small but I got a line on a 10gal aluim. tank. What you think? this is not for 24/7 operations but will be run for 3 to 4 hrs and down for 3 to 4 hrs. I got to find out how clean the power will be.

That's alot of money for basically a diesel "whiz banger" That's what Sound Guy calls little motors. It's not like a tractor diesel turning 2000 rpms or less, I think that has to spin at 3600 rpm to make 60 hertz, so it's not gonna have the long life you may think, I would be curious how it's life expectancy would compare to a gasser myself..

It's probably better than a gasser for a few different reasons, but for a little more money you could get something in a sound/weather enclosure at least and possibly an 1800 rpm unit, though those are usually water cooled which gets heavier and more expensive.

The biggest advantage of that diesel unit to a Honda gasser is the fuel stability issue, which to me is a big thing, but it does cost twice as much though.

JB.

 

[IXLR8]

I am considering the same generator. I have PM'ed the guy here who bought one last fall... no response so far. I would love to get an 1800 rpm generator... but any that I have found are at least double in cost from the 3600 rpm generators. Yanmar engines are known for their reliability, even the chinese clones of the Yanmar engine are expected to run for over 1000 hrs.. which for emergency power situations is more years than I have left. With that in mind... I suspect that I am going to end up with one of the chinese clones for 1/2 the money of the Yanmar.

 

[schmism]

I think that has to spin at 3600 rpm to make 60 hertz, so it's not gonna have the long life you may think,
JB.

that depends on the generator head. the more poles the slower it can turn.

2 pole is 3600rpm
4 pole is 1800rpm

1800rpm would make much more since for a diesel so im inclined to think its a 4pole genn head but there are no such specs listed on the link for the thing so I cant say for shure.

the chinfa versions get good reviews especially if you spend a little maintenance on them.

 

[JB4310]

that depends on the generator head. the more poles the slower it can turn.

2 pole is 3600rpm
4 pole is 1800rpm

1800rpm would make much more since for a diesel so im inclined to think its a 4pole genn head but there are no such specs listed on the link for the thing so I cant say for shure.

the chinfa versions get good reviews especially if you spend a little maintenance on them.

I will go out on a limb and guarantee it's a 2 pole. I've yet to see a 1 lung 4 pole. You really gotta have some weight spinning to keep that 60 hertz dialed in at only 1800 rpms.

Kinda the same storey with everyone who first gets a pto genny, they all (myself included) want to gear up the pto output so they can idle down their tractors, only problem is the governors can't handle it. might work if your only drawing a fraction of the output/horsepower rating.

For that reason the stand alone 4 poles are usually 3 cylinders even down to 5 KW, and Most if not all now are liquid cooled. I think Kubota as well as other quality manufacturers were making nice compact, enclosed 4 pole units, but I haven't seen them available lately, I think it has to do with them not meeting emissions standards.


The China ones do look good, but I don't know if I would trust them yet. they are exact visual copies, but doubt they come close to the quility made machines they are copying.

A guy was trying to sell me 2 job site, open frame, 6kw, 1 cyl diesel models, for $1,200. they were brand new, didn't buy though.

JB.

 

[dex3361]

I bought the Aurora/ OPtigenerator 6KW unit and I have about 25 hours of break in and testing on the unit. If I were to purchase it again I would by direct from OPTIGENERATOR instead of Aurora because they are the same unit.

I load tested the unit at various KW loads and it will easily supply the stated watts and it will surge the stated watts.

The voltage 0Watts- 242V and 60.3hz
1000Watts- 240V and 60.1hz
5500Watts- 238V and 60.0hz
6500Watts- 236V and 59.7hz

I also did a test to see if it would run my Hot water tank (240V-4500W) along with my 1/2 HP submersible well pump. The generator did just fine and I run it at this load for 2 hours.

I adjusted the valves after 22 hours and I changed the oil and wehn I changed the oil I went with Rotella 5w-40 synthetic. I was impressed with the build quality of the motor as well.

I bought the open frame unit and it has brushes and they are easy to service. The enclosed silenced unit is brushless.

 

[IXLR8]

I bought the Aurora/ OPtigenerator 6KW unit and I have about 25 hours of break in and testing on the unit. If I were to purchase it again I would by direct from OPTIGENERATOR instead of Aurora because they are the same unit.

I checked both sites, for the same generator, it looked like OPTI (at $1399.0) was $200 more than the Aurora (at $1199.00) ?? Did I miss something??

 

[JB4310]

In defence of the diesel china generators, I was at a contractors rental place and the manager there told me that's what they are renting out now, in the 6-8 KW range. He claimed they had no serious problems, and they're cheap enough that they pay for themselves quickly.


JB.

 

[dex3361]

I checked both sites, for the same generator, it looked like OPTI (at $1399.0) was $200 more than the Aurora (at $1199.00) ?? Did I miss something??

You are correct it appears that Opti has raised their price. I will also say that I was able to negotiate an extra $100 off of Auroras price when I called and talked to them over the phone. The are the same generator though.

 

[RonMar]

Well in my experience, anyone who is claiming more than a 2HP per killowatt output is blowing smoke(or their generator will be sooner than it should). People have been making electricity with diesels since the diesel was invented. The rules surrounding this are well proven. Sustainable power requires 2HP per KW of output. For the generator posted by the OP, You cannot sustain 6.6KW output on 10HP... Look at any major generator manufacturer, Onan, Cat ECT. A 15KW genset uses at least a 30HP engine...

The generator the OP posted is most certainly a 3600 RPM unit. As mentioned, I also don't think it would have enough spinning mass to maintain frequency stability at 1800 RPM.

On that generator, The spread between continous and max ratings is only 275 watts! This either indicates a generator head that has barely enough copper and cooling airflow in it to maintain it's continous rating(will run hotter), or that the seller has inflated the continous rating to over price their generator, yet still undersell the legitimate producers of gensets in the higher continous rateing catagory. IMO, that is a 5KW genset wrapped in a 6.5KW pricetag...

The last two sets shown, Opti and Aurora I think, have much more "believable" specifications IMO.

Whatever single cyinder generator you choose, you should look for one that uses an Automatic Voltage Regulator. This will give you the most stable output and least "Flicker" from a single cylinder 4 cycle generator.

 

[dex3361]

I have researched these generators and Aurora and Opti generators are a 13 HP engines if you check the model#s of the Yanmar it may be the Larger Bore/Longer Stroke as well. My testing indicated the Aurora and Opti gensets were probably underrated KW wise. The motor didn't smoke on the verified KW loads. In other words the motor seems to be strong.

 

[RonMar]

I have researched these generators and Aurora and Opti generators are a 13 HP engines if you check the model#s of the Yanmar it may be the Larger Bore/Longer Stroke as well. My testing indicated the Aurora and Opti gensets were probably underrated KW wise. The motor didn't smoke on the verified KW loads. In other words the motor seems to be strong.

One of the two, I think it was the Opti, rates it's engine at 11HP, which matches with 2HP per KW, it's 5.5KW sustained rateing...

 

[dex3361]

One of the two, I think it was the Opti, rates it's engine at 11HP, which matches with 2HP per KW, it's 5.5KW sustained rateing...

No doubt there is some confusion when you start looking at the data and I think it stems from the original design HP. Here is a link to the Aurora Generator page listing the info on the HP I know my generator shipped from Optigenerator and I have looked at their part #s and bore and stroke and all appears the same. The load testing indicated motor was not fully loaded at 6.5KW so I am inclined to believe the 13HP rating. I wouldnt think that Optigenerators would carry a different sized generator for their labeled generators.