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DD716TED

Washington State

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Joined: 10/27/2003

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Posted: 07/19/20 02:24pm Link  |  Quote  |  Print  |  Notify Moderator

My son just purchased a used Toy Hauler that has a Suburban SW10 DE water heater in it.. When he plugged the trailer power cord into shop power (120VAC) it immediatelt tripped the shop outlet breaker.. He then shut off all 120 VAC breakers in the trailer on the power panel and reconnected power..all worked fine until he turned on the Hot Water Heater and then the shop breaker tripped again.. The breaker for the Hot Water Heater in the trailer never tripped at all.. It seems to me that if the HW Heater had a fault, the in trailer Breaker would have tripped and not the shop outlet supply.. Just looking for ideas?? Bad heting element in HW Heater? Or other problem elsewhere?? Don't want to have him tear things apart of a goose chase.. Any ideas would be appreciated..

mobeewan

Hampton, Va

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Posted: 07/19/20 03:44pm Link  |  Quote  |  Print  |  Notify Moderator

Sounds like he is pulling too much power from the circuit in the shop. I am assuming he has a 30 amp trailer connection I am also assuming the shop circuit is 15 amps (1800 watts) or 20 amps (2400 watts). The refrigerator draws about 600 watts, the power converter that charges batteries and runs the 12v appliances can pull another 600 watts totaling 1200 watts. Adding anything else of 120 volts doesn't leave much for the water heater. So the shop breaker will keep tripping.

Another thing that could be making the shop breaker trip is if there is a regular extension cord which is only rated for less than 15 amps plugged in between the shop receptacle and the trailers 30 amp plug and cord. The longer the length of wire the less amperage can pass through so the appliances will try to draw more amperage resulting in the breaker overloading and tripping. If the bresker doesn't trip the wiring will over heat and cause a fire.

* This post was edited 07/19/20 04:00pm by mobeewan *

mobeewan

Hampton, Va

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Posted: 07/19/20 04:01pm Link  |  Quote  |  Print  |  Notify Moderator

*

Dusty R

Charlotte Michigan 48813

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Posted: 07/19/20 04:03pm Link  |  Quote  |  Print  |  Notify Moderator

What size is the breaker in the RV? And what size is the one in the shop and is there anything else plugged in and running on it?

wa8yxm

Wherever I happen to park

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Posted: 07/19/20 04:04pm Link  |  Quote  |  Print  |  Notify Moderator

There are, far as I know 3 main types of breakers (Plus a couple sub types that won't affect this thread)

Standard. Trip if overloaded current wise
ARC-FAULT. Trip if they detect an arc on the down line in addition to current
GFCI Trip if there is ground fault (in addtion to current)

And how big is the shop breaker?

It may be that there is too much draw. if shop breaker is 15 amp Heater pulls about 12.5 (it SHOULD hold but it's borderline) but the Fridge draws around 3 and the converter up to about 10.. CLICK CITY even a 20 amp will go if that happens.

Arc fault a bad heater thermostat (relay on an Atwood) may do it.
GFCI.. Well I've heard of issues with the heat element the insulating jacket can crack. causing a ground fault.

IF it turns out to be the heat element (Rare but can happen) May I suggest you go to a 1500 watt 240 volt element..(that's 375 watts at 120 volt) takes a bit longer (4x) to heat the water but also less likely to trip a 30 amp park breaker.


Home is where I park it.
Kenwood TS-2000 housed in a 2005 Damon Intruder 377


BB_TX

McKinney, Texas

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Posted: 07/19/20 07:54pm Link  |  Quote  |  Print  |  Notify Moderator

The hot water heater has a 1,440 watt heating element and pulls 12 amps by itself. Much else on at the same time will trip a 15 amp breaker.

mchero

Henniker, NH

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Posted: 07/19/20 08:01pm Link  |  Quote  |  Print  |  Notify Moderator

Hopefully the hot water heater had water in it when the AC heating element powered up.


Robert McHenry
Currently, Henniker NH
07 Fleetwood Discovery 39V
1K Solar dieselrvowners.com
2005 Jeep Grand Cherokee
Prior:1993 Pace Arrow 37' Diesel

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