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Old 02-03-2017, 12:35 AM   #21
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Pedestal 30 amp Breaker

Originally Posted by gectisme View Post
Not saying your wrong, every RV is going to be a little different and don't forget the Converter/Battery Charger too. But, we ran all summer with A/C, Electric Water Heater, 2 fridges without ever tripping the breaker. The only time we have tripped a breaker was when we ran the microwave with all those things on.

True - also the power control center (converter).

On our Forester 2401R, in amps:

A/C Dometic 459196 15,000 BTU: compressor 13.3A + fan 2.0A = 15.3A

Atwood 6 gal. GC6... not in manual, Atwood service manual online refers to 1400W/12.7A

PDI Power Control Center PD4060K: 1000W input = 8-9A (based on stated 110-120V range)

Total if all running at max (not counting A/C startup mode demand): 36-37A

So that combo is a no-go on a 30A system.

The converter may be presumed to run lower after the battery is charged, but even without any of that, the load is 28A so very close to capacity.

"Your results may vary."
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Old 02-18-2017, 11:24 AM   #22
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Brought my 50 to 30 back with me after I took wife home to IL. She had to go back to work. Flipped main breaker off in trailer, installed 50 to 30, turned trailer breaker back on. I've been back in Florida 3 days now and no problems yet.

Thanks for the advice.
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Old 02-18-2017, 11:37 AM   #23
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Old 02-18-2017, 04:12 PM   #24
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Reading thru this tread piqued my curiosity. I vaguely remembered reading somewhere that breakers really had 2 ratings - max and continuous. So I did some surfing. Based on what I found, you can expect your 30 amp breaker to pop if you exceed 30 amps but it may take an hour to pop! It doesn't have to pop immediately. Also the breaker will likely pop if you pull around 24 amps for an extended period of time. These comments are based on finding the following info...

1. T-M breakers trip upon reaching the rated current.
T-M breakers trip according to a trip curve, which includes both 135 percent and 200 percent trip times. At 135 percent of rated current, the breaker must trip in 1 hour or less. The trip curve is non linear as loads approach the breaker ratings (FIGURE 1), therefore, at even 5 percent above trip rating, there is no guarantee that the breaker will ever trip.
2. T-M circuit breakers always trip immediately.
These breakers trip thermally in seconds to minutes (depending on current level), per the published trip curve, in overload situations. In short circuit situations, trip times can be several cycles (ac voltage inversions).

The general run of molded case circuit breakers in frame sizes of 400 A and below are rated to carry only 80 percent of their rated trip current on a continuous basis. Particularly when these breakers are mounted close to each other in a panelboard, the extra heat generated by carrying 100 percent of the trip rating will both lead to false tripping and cause long-term degradation of the insulating material of which these breakers are made.
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Old 02-19-2017, 09:15 PM   #25
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On the subject of dogboning from 30 to 50 amp, can I still use my portable 30amp PI EMS while doing that?
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Old 02-19-2017, 10:00 PM   #26
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i'm assuming you mean a 30 amp male to 50 amp female dogbone. sure you can use a portable 30 amp ems. you will have to plug it into the pedestal and then plug the 30 amp male end of the adapter into it. remember you really only have a 30 amp circuit into your rv, even though it is travelling down a 50 amp cable.
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Old 02-19-2017, 10:34 PM   #27
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The dog bone splits the voltage...
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Old 02-19-2017, 10:45 PM   #28
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Originally Posted by mordecai View Post
On the subject of dogboning from 30 to 50 amp, can I still use my portable 30amp PI EMS while doing that?
Yes. The way the 50 amp male to 30 amp female dogbone adapter works (which I am assuming you have a 30 amp RV thus the 30 amp EMS) is that the adapter just terminates one of the 120/240 legs that a 50 amp RV utilizes (50 amp has TWO 120 volt hot legs where a 30 amp just has one). It's just not connected to anything feeding your RV.

Since the adapter terminated one of the hot legs inside the adapter, you only have the single leg 120 volts feeding into your RV's 30 amp power cord. Although it is capable of providing 50 amps (instead of 30), your EMS will function as normal. You just want to keep your power usage to 30 amps as you normally would when connected to a 30 amp power supply. Everything else functions as normal.

This schematic may help:

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Old 02-19-2017, 11:29 PM   #29
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Great! Thanks, folks.
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Old 02-22-2017, 07:27 AM   #30
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For some campers with electrical understanding is is frequently better to create 2, 50-30 adaptors, rather than purchase one at the camping store..

As the diagram above shows one 120v leg is used from the two power legs that create the 240V 50A.

AS almost all the store plugs are wired the same , at times lots of folks will be drawing from the same 120V leg.

With 2 adaptors and a volt meter it is easy to select the less used leg with the highest voltage.

This will not get more amps to your rig , but with the higher voltage the air cond will labor less and last longer.
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