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Old 11-10-2012, 07:27 AM   #16
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standby generator installation cost


hello, I have 5 gensets, ranging from 6500 Onan to 15000 Kubota/Maccalte

I am off grid and use 9000 watts of solar and gensets to back up solar.

If you can, get the largest genset you can afford...this is from experience of 8 years of off grid living...the power company wants 500000.00, thats 500K to bring in power over 8 miles from grid.

You will enjoy the power even if you do not use it all.

also, explore who can service genset and can you take it to them or what is their service charge to come out. these machines must be run under load from time to time.
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Old 11-10-2012, 07:35 AM   #17
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Quote:
Originally Posted by genset willy View Post
the power company wants 500000.00, thats 500K to bring in power over 8 miles from grid.
The way I see it YOU chose to build a house 8 miles out in the middle of no where. And unless they are getting the revenue from a whole community why should they pay for the infrastructure?


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Originally Posted by genset willy View Post

If you can, get the largest genset you can afford...
The reason for this is so that even when the load is relatively light it will still use a HUGE amount of fuel.



Sorry Willy, I don't think you can use your "off-grid" situation as basis for advice for those of us that live in the real world.
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Old 11-10-2012, 08:34 AM   #18
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excellent observation. actually we are 22 miles from nearest town and 50 miles south of Phoenix.

I would like to review your source of a huge amount of fuel so that I can compare with my diesel gallons per hour.
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Old 11-10-2012, 08:37 AM   #19
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I would like to review your source of a huge amount of fuel so that I can compare with my diesel gallons per hour.
I don't have a "source". I DO know that the larger the genset the more fuel it uses, regardless of the load.
Maybe you can help me find a "source".

I know that the propane guys told me once that the 20kW unit I was installing at the time would empty the two 200# tanks in 3 days with half load. To me and most normal residential customers, that's HUGE.
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Old 11-10-2012, 08:56 AM   #20
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Fuel choice: Operating cost on natural or LP gas is horrendous. Consumption of those gaseous fuels is quite large. In a cold climate, getting adequate LP gas evaporation is nearly impossible unless the engine is liquid fed. 100LB tanks just don't cut it. Gasoline stability is primarily affected by moisture. A little dry gas and yearly, or better, twice yearly drain & refill prevents most problems.

Read more: http://www.survivalmonkey.com/pages/...#ixzz2BpcGvPQA

It is VERY easy to overload a generator. Motor loads in particular, such as water pumps, refrigerators, and air conditioning, consume large amounts of power and will either damage an undersized generator or be damaged themselves if the generator is of insufficient capacity. Fortunately this is easy to avoid. Generators are rated in watts or kilowatts (kW) and it is a fairly simple matter to determine the wattage of appliances to be powered by the generator. Appliances have a serial number plate attached to the rear or bottom with the voltage and amperage necessary to run them. Multiply voltage times amperage to get the wattage necessary, then add 20% for the surge current necessary to get the motors up to speed. A few examples are: Refrigerators, from 100 to 12oo watts, oil or gas furnace 750 to 1000 watts, water pumps from 500 to 2000 watts, and TV/radio 300 watts. As you can see, this adds up quick and anything less than 5kW can run only one appliance at a time. As far as the generator itself goes, bigger is better.
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Old 11-10-2012, 09:04 AM   #21
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Quote:
Originally Posted by Speedy Petey View Post
I don't have a "source". I DO know that the larger the genset the more fuel it uses, regardless of the load.
Maybe you can help me find a "source".

I know that the propane guys told me once that the 20kW unit I was installing at the time would empty the two 200# tanks in 3 days with half load. To me and most normal residential customers, that's HUGE.
Fuel Consumption (Diesel)
Perkins 9kW - .45 Gal/Hr @ 50% load, 0.79 Gal/Hr @ 100% load
Perkins 20kW - .45 Gal/Hr @ 50% load, 0.79 Gal/Hr @ 100% load
Perkins 24kW - .45 Gal/Hr @ 50% load, 0.79 Gal/Hr @ 100% load

30, 40, and 50kW Perkins generators are rated differently; all have a specific fuel consumption of 243 g/Hr.

So it would appear that, at least within this range, higher output does not translate into higher fuel consumption. At full load, it looks like 20 gal/day for round-the-clock operation.

Source: Emergency Power . com
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Old 11-10-2012, 09:09 AM   #22
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most diesels run at half the speed of gasoline/lp nat. gas gensets. more torque, less rpms needed.

so to make an assumption, without adequate knowledge of machinery in comparison is a HUGE mistake.
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Old 11-10-2012, 09:09 AM   #23
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Quote:
Originally Posted by Dave632 View Post
Fuel Consumption (Diesel)
Perkins 9kW - .45 Gal/Hr @ 50% load, 0.79 Gal/Hr @ 100% load
Perkins 20kW - .45 Gal/Hr @ 50% load, 0.79 Gal/Hr @ 100% load
Perkins 24kW - .45 Gal/Hr @ 50% load, 0.79 Gal/Hr @ 100% load

30, 40, and 50kW Perkins generators are rated differently; all have a specific fuel consumption of 243 g/Hr.

So it would appear that, at least within this range, higher output does not translate into higher fuel consumption. At full load, it looks like 20 gal/day for round-the-clock operation.

Source: Emergency Power . com
So this is saying a small motor on a small generator will use exactly as much fuel as a larger motor on a larger generator with a much higher output?
Sorry, this defies logic.

Saying a 9kW genny, with a load of 4500 watts, will use the same amount of fule as a 20kW genny under a 10,000 watt load...is like saying a 3000# Honda will use the same amount of fuel as a 6000# F250 if they go the same speed.
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Old 11-10-2012, 09:11 AM   #24
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Quote:
Originally Posted by genset willy View Post
most diesels run at half the speed of gasoline/lp nat. gas gensets. more torque, less rpms needed.

so to make an assumption, without adequate knowledge of machinery in comparison is a HUGE mistake.
So then comparing a big diesel genset to a nat/LP set (like the OP is asking about) is ALSO a HUGE mistake.

I'll reiterate. You can't compare your situation to a small standby residential unit.
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Last edited by Speedy Petey; 11-10-2012 at 09:14 AM. Reason: typo
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Old 11-10-2012, 09:12 AM   #25
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Funny, this chart shows a 20kW unit uses twice the amount of fuel as a 10kW unit.
HOW is that possible???

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Old 11-10-2012, 09:18 AM   #26
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in reiteration, get the largest you can get; know why you are getting the largest and you will not be sorry. a lot of people shy away from diesels, I know I did and wish I went with diesel from the beginning. I had an LP that took a lot of cash to run. It makes sense to spend the same amount of money for twice the power at half the cost of fuel as a diesel offers and yes they make a 7500 diesel genset, water cooled. can be purchased at Central Maine Diesel, Bangor Maine, no freight. about 5000.00 bucks.
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Old 11-10-2012, 09:20 AM   #27
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now, pull up same info with diesel fuel
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Old 11-10-2012, 09:24 AM   #28
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Sorry, I missed the fact the OP wanted a NG system. I do agree with Willy that diesel would be the way to go if you don't have NG service, especially if you could also use the diesel in one of your vehicles. But then you'd have to remember to get taxed, on-road diesel instead of off-road diesel fuel.
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Old 11-10-2012, 10:04 AM   #29
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Quote:
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now, pull up same info with diesel fuel
No, you can do that for us.

99% of people just want to make a phone call and get their propane refilled. If you want to be a slave to fuel cans and manually filling generators that's fine. Your average person from NJ or NY probably feels different.
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Old 11-10-2012, 10:07 AM   #30
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Quote:
Originally Posted by genset willy View Post
in reiteration, get the largest you can get;
I'll reiterate. Get the appropriately sized generator for your home. More is NOT always better.

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