jimandsue60
North America
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My question is can a Prevost with the over the road a/c units (3-4) or the roof top a/c keep a 45 foot coach cool on 30 amps while still operating the other systems needed for daily life, without running the generator.
Jim
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bsinmich
Holland, MI
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You can run any one AC on the 30 amps and with an energy monitoring system you can squeeze 2 AC out of 30 amps. If you have 2 running you will have nothing left for anything else. That is what a generator is to be used for. 30 amp is nothing for an RV that size.
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DebDav
SE TX
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Roof top AC units draw from 1600+ amps to run with 2500+ amps to start. There are devices that will cycle different high amperage devices to allow more of them to operate with a 30 amp supply.
I do not think that any RV will be able to operate more than two units with probably very few additional powered items.
Maybe the coach has a smart inverter-large battery bank system that will provide power for a short time. This would require many very large batteries (maybe multiple electric fork lift batteries).
Most entertainer coaches have multiple generators that are always operating providing power to keep the talent happy.
DebDav 
93 Prevost H3-40 - converting
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djevans
Tennessee
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I'm not sure what "source" you're referring to, but even recharging the batteries with a massive alternator, well, I don't think it (the RV inverter and batteries) will keep up. Are you referring to the vehicle inverter? I know you can get two compressors, maybe 3, (if it's a little one, better yet all all three are little ones) but you can forget 4 for sure unless they are all VERY small) As William mentioned, you might do a whole lot better with an EMS perhaps , a "smart" EMS (one that knows not to let any of the compressors come on line at the same moment) but you won't have any real headroom if you some how manage to get 3 compressors running.
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Bikeboy57
Texas
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No, to your specific question.
You can run ONE of the AC units and the other normal stuff on a 30 amp circuit.
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jimandsue60
North America
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Bikeboy57 wrote:No, to your specific question.
You can run ONE of the AC units and the other normal stuff on a 30 amp circuit.
Which would not keep the coach cool at at 95 degrees or higher at a comfortable 72-75 degrees. Not that this is a bad thing. I am just trying to figure out the capabilities of the systems.
Jim
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deandec
El Dorado Hills, CA
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We have what is called the OTR A/C which cools the bedroom and the cab. It does a fine job in those locations. On hot days, we run the roof air in the salon area using the generator. However, we are only 38' with a 7500W generator. A 45' Prevost will have twice as much generator power.
Our Gillig OTR A/C will not run when parked since it is engine driven. Perhaps the Prevost has a different OTR system.
Dean
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raythom
Austell GA
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DebDav wrote:Roof top AC units draw from 1600+ amps to run with 2500+ amps to start. There are devices that will cycle different high amperage devices to allow more of them to operate with a 30 amp supply.
I do not think that any RV will be able to operate more than two units with probably very few additional powered items.
Maybe the coach has a smart inverter-large battery bank system that will provide power for a short time. This would require many very large batteries (maybe multiple electric fork lift batteries).
Most entertainer coaches have multiple generators that are always operating providing power to keep the talent happy.
I would love to have a gen set that large. Mine wont put out more that about 60 amps.
Ray & Mollie Thomson
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Rich D.
New England
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DebDav wrote:Roof top AC units draw from 1600+ amps to run with 2500+ amps to start. There are devices that will cycle different high amperage devices to allow more of them to operate with a 30 amp supply.
I do not think that any RV will be able to operate more than two units with probably very few additional powered items.
Maybe the coach has a smart inverter-large battery bank system that will provide power for a short time. This would require many very large batteries (maybe multiple electric fork lift batteries).
Most entertainer coaches have multiple generators that are always operating providing power to keep the talent happy.
Of course, he meant watts not amps.
Rich D. Wanderlodge LXi 43'
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Mangomike
Alexandria, Va.
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Joined: 12/13/2004
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Jim,
Over the Road air (OTR) in a Prevost is the optional factory installed A/C that runs only off the engine. It's a massive system designed to keep 40+ passengers cool in any situation. While tooling down the road it will cool the bus down like a meat locker. Unfortunately it takes a full bay worth of space.
With the exception of Liberty most converters choose not to use OTR.
Traditionally, until recently, they have used 3 or 4 cruise air units to cool the bus when plugged in to shore power or with the 20 kw generator running. Some of the newer busses will run up to 2 units off the inverters. (Specifically the Marathons 2000 and newer)
Now a lot of the converters have switched to the roof top units, with hidden duct work to cool the coach.
Mike
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