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Old 09-26-2017, 06:18 PM   #1
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upgrading to a 240v dryer

Hello All,

A quick question regarding 240v dryers. On high end rigs such as the King Aires and units above that price point, the manufactures offer a 240v dryer. This has me thinking, why can't we convert our rigs to support the 240v?

I would run new conduit, change the wire size to a minimum of 10aug and install a new 30 amp breaker. I have to be missing something as it cannot be this simple.

Mine, as well as those rigs require 50 amps. Is there some type of computer system that controls the ac units to run independently as to not exceed the 50 amp threshold or do those dryers work only on generator and not shore power?

I would also love to hear from those who have a 240v dryer and if you like it.

Thank you in advance.
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Old 09-26-2017, 06:48 PM   #2
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Originally Posted by lenny-shawna View Post
Hello All,

A quick question regarding 240v dryers. On high end rigs such as the King Aires and units above that price point, the manufactures offer a 240v dryer. This has me thinking, why can't we convert our rigs to support the 240v?

I would run new conduit, change the wire size to a minimum of 10aug and install a new 30 amp breaker. I have to be missing something as it cannot be this simple.

Mine, as well as those rigs require 50 amps. Is there some type of computer system that controls the ac units to run independently as to not exceed the 50 amp threshold or do those dryers work only on generator and not shore power?

I would also love to hear from those who have a 240v dryer and if you like it.

Thank you in advance.
RV 50 amp is nothing special. It is 240VAC ... 2 legs of 120VAC with a neutral and safety ground. It is the same when it enters the RV and is distributed as 2 legs of 120VAC at the main distribution box. If you measure across those 2 legs you will get 240VAC.

The primary reason residential 240VAC dryers aren't used in RVs is size. And, you would typically pair it with an equally big washer.

With 240VAC appliances you lose the ability to connect to 30 amp pedestals (adapter).
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Old 09-26-2017, 06:55 PM   #3
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Most generators typically are a single leg of 120vac, which is put onto both power legs at the transfer switch.

So if you measured leg to leg across the main breaker in your circuit breaker box, you would get 240v when on shore power. However when on generator, leg to leg voltage is 0 volts. Leg to Neutral in either scenario is of course 120vac.
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Old 09-26-2017, 07:03 PM   #4
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You will need a double 30 amp breaker and a double slot to clip it into. Does your panel have that kind of buss bar.

Some RV panels put the main, double 50 breaker, in the center and send one leg each way. There is no 240 volt slots.

As far as sharing 50 amps, a 50 amp 120/240 volt service gives you 50 amps per hot leg for a total of 100 amps at 120 volts.
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Old 09-26-2017, 08:56 PM   #5
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We have a 240 volt dryer in our Essex, works great.
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Old 09-26-2017, 10:59 PM   #6
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We have a 240 volt dryer in our DRV 5er. It works just like the one at home. I also installed a commercial Onan 6500 watt lp generator that is two phase (produces 240 volt). This allows me to run the dryer on 50 amp shore power or generator power. It all works as designed.

It is a fairly simple matter to add a 240 volt plug to your 50 amp power panel if it is the correct style panel. It needs to be a panel that has the double pole 50 amp feed breaker at one end of the panel box and then each subsequent breaker is on an opposing line (line 1, then line 2, then line 1, then line 2, etc.). You then need two free slots in the panel that are next to each other, one from line 1 and one from line 2. Simply add the appropriate sized double pole breaker and run the correct sized wire from the breaker to the proper 240 volt plug wher the dryer will be located. It is no different than installing the same set up in your home.

The plug will only work when you have two phase power available, like a 50 amp cord plugged into a 50 amp power pedestal. (Or in my case a two phase generator option.). It will not work when plugged into a single phase outlet like a 30 amp power pedestal or a 15/20 amp receptacle.
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Old 09-27-2017, 07:49 AM   #7
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If your generator is an Onan 10K QD, you will have no problems with running your W/D on 240V. If you have a Onan 8K QD, you will get what Kiawah posted.
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Old 09-27-2017, 08:01 AM   #8
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If your generator is an Onan 10K QD, you will have no problems with running your W/D on 240V. If you have a Onan 8K QD, you will get what Kiawah posted.

or a 12.5KW which is also spec'd at 240/120.
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Old 09-27-2017, 09:25 AM   #9
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wiring is an easy part.

to have 240v power 24/7, you can replace your inverter to magnum ms4048 or ms4448pae. this inverter will output 120/240v. shore or your generator will just simply charge the battery, inverter does the job.
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Old 09-27-2017, 10:09 AM   #10
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wiring is an easy part.

to have 240v power 24/7, you can replace your inverter to magnum ms4048 or ms4448pae. this inverter will output 120/240v. shore or your generator will just simply charge the battery, inverter does the job.

?????

I am on shore power .... my inverter is turned off. Same when on Genset.

The inverter can be off and the charger on.

The inverter is only a necessary component when shore power or a genset is not available for AC devices.
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Old 09-27-2017, 10:54 AM   #11
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Quote:
Originally Posted by lenny-shawna View Post
Hello All,



A quick question regarding 240v dryers. On high end rigs such as the King Aires and units above that price point, the manufactures offer a 240v dryer. This has me thinking, why can't we convert our rigs to support the 240v?



I would run new conduit, change the wire size to a minimum of 10aug and install a new 30 amp breaker. I have to be missing something as it cannot be this simple.



Mine, as well as those rigs require 50 amps. Is there some type of computer system that controls the ac units to run independently as to not exceed the 50 amp threshold or do those dryers work only on generator and not shore power?



I would also love to hear from those who have a 240v dryer and if you like it.



Thank you in advance.


Should be doable reasonably easily. Just be aware that unless you have a generator that outputs a true 240 VAC then your dryer will not operate on generator power. With the Onan line, only the 10 & 12.5 KW models provide a split phase 120/240 service.
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Old 09-27-2017, 01:08 PM   #12
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The ease [or not] of converting depends on what you now have. Many 50A rigs do not have a load center (breaker box) that supports the use of 240v breakers on the bus bars, even though there is in fact 240v available at the input terminals. You could always install a secondary panel with 240v-capable bus bars, though.

Some RV gensets, e.g. the popular Onan QD 7500/8000 model, do not provide 240v output even though they generate more than 50A. The QG 7000 is another like that. They have 2x 120v power lines, but no way to get 240v.

If you do already have a 240-capable load center, it's as simple as installing the twin-30A breaker and running the 10/3 wire to the dryer location.
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Old 09-27-2017, 02:18 PM   #13
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The ease [or not] of converting depends on what you now have. Many 50A rigs do not have a load center (breaker box) that supports the use of 240v breakers on the bus bars, even though there is in fact 240v available at the input terminals. You could always install a secondary panel with 240v-capable bus bars, though.

Some RV gensets, e.g. the popular Onan QD 7500/8000 model, do not provide 240v output even though they generate more than 50A. The QG 7000 is another like that. They have 2x 120v power lines, but no way to get 240v.

If you do already have a 240-capable load center, it's as simple as installing the twin-30A breaker and running the 10/3 wire to the dryer location.
Ah yes .... the space for the dryer
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Old 09-27-2017, 03:44 PM   #14
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?????

I am on shore power .... my inverter is turned off. Same when on Genset.

The inverter can be off and the charger on.

The inverter is only a necessary component when shore power or a genset is not available for AC devices.
people were talking about all kind of scenarios, one of those is that the generator is single phase no 240v output... to gurantee the availability of 240v either on or off shore, the two models of the inverter i suggested will do the job.

of course we all know 50am shore power will have 240v, as only as the coach is wired properly and ats is working.

i never turn off inverter. when shore or genset power is present, it just passes the power on .
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