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Old 03-30-2011, 01:08 PM   #1
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Generator Question


We have purchased an inflatable obstacle course that travel with us throughout the year. There are times when we do not have access to power at some of our locations. Therefore we wanted to purchase a suitable generator. There are 3 blowers that each require power (can all work on shared cord).
• Each blower is 8.8 amps and draws 8,000kw of power
• We are told that when these are first turned on they surge to 2-3 times their wattage and then settle back down to 8k.
• We tried using a 5500 watt, 50amp generator and it could not maintain the power needed. We’re trying to determine what size generator is needed.
• We need to look at a quiet generator since regular generators are way too loud to put next to this.
• We sourced a few generators but wants to make sure this is the right way to go based on the amp and KW surge needs.
• These generators seem to have multiple outlets for different uses. We’re not sure if we can use multiple outlets and plug the blowers into different outlets or if we just run a cord off of one outlet and plug the blowers into that one cord.
• We understand the surge issue and would only plug one in at a time, starting with the first one, then the second, then the third until all 3 were running at full amps.
So my question is what power generator we would need to support these blowers and what is available in a quiet generator.

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Old 03-30-2011, 01:21 PM   #2
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Generator Question


Your numbers don't add up. 8,000 KW per blower? Even 8KW doesn't make sense. 8.8 amps @ 120 volts is only 1056 watts. Are these blowers operating at 120 volts or 240 volts?

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Old 03-30-2011, 01:25 PM   #3
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I assume these are 115 VAC blowers? Your numbers are seriously off. A running current draw of 8.8 amps is approximately a 1000 watt (1KW) power demand for each one. But depending on what kind of motors they have, starting current can be 8 or 9 times that amount for a short time. You are getting into the area of not-so-portable (or trailer-mounted) generators. I expect at least a 10KW unit is needed.
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Old 03-30-2011, 01:55 PM   #4
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These are 115 Volts. The current generators being used are:

http://b-air.com/inflatable/kodiak2.htm
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Old 03-30-2011, 02:11 PM   #5
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9amps each X 3 units x 120 volts = 3240 Watts

Now you said a 5000 watt gen was not enough? try 7000

I recommend Honda Generators because they are very quite and well built
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Old 03-30-2011, 02:13 PM   #6
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oh and make sure you are comparing the generators steady rating not its peak.
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Old 03-30-2011, 07:09 PM   #7
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Quote:
Originally Posted by Saturday Cowboy View Post
I recommend Honda Generators because they are very quite and well built
And VERY expensive.
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Old 03-30-2011, 08:26 PM   #8
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The other thing you have to keep in your mind with most portable generators if you do not have full power 120 volt feature you have to kinda balance the load between the two hot legs { I know most med to larger portable generators will have this set up }

So keep two blower on one 120 volt receptale while third blower on diffrent receptale plus lights if you have them that will help a bit.

otherwise you may have to make a pigtail adpatour to use the full capaity of generator itself. { this part make sure you have full 4 wire capaitable } and if you want to go this route I think some do make pigtail of that verison otherwise I can make a list of materals so you can able use full load of generator itself.

Merci.
Marc
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Old 04-07-2011, 10:14 AM   #9
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Please make a list of materals so I can be able use full load of generator itself.

Thank you.
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Old 04-07-2011, 09:23 PM   #10
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The materal list will varies a bit depeneding on generator size so I will come up with a listing in a little bit.

Merci,
Marc
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Old 04-08-2011, 05:47 PM   #11
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According to the specs for the blowers,
They list max currant with back pressure as 8.8a.
So three times 8.8 = 26.4a or 3168w.
But I would double that, so go for a 7Kva.
Are there any other loads on the genny,
such as lights ?
Finding a quiet genny of this size will not be cheap.
But they are out there.
You could also consider 3 x smaller 2.5kva gennys.
Quiet 2.5Kva gennys much easier to get.
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Old 04-08-2011, 06:14 PM   #12
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Try starting the blowers one at a time so you do not impose the 3 starting voltages all at the same time.

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