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Old 02-06-2020, 09:28 AM   #1
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Convertor experts please help

Hi there, I just got a pre-owned travel trailer, 2003 Wildcat 29BHS, everything so far seems to be working well electrically. I was checking the convertor to see what this trailer came with and noticed the "main" 120v breaker is only a 20/20 amp split breaker. Does this seem right. I see many of the newer replacement units have a 30/20 split breaker. My trailer does have a 30 amp cord. Any help or insights are appreciated. I've attached a photo of the unit.


Thanks, JT


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Old 02-06-2020, 09:35 AM   #2
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It sure seems as though it was replaced as every one I've seen like that have had a 30a side of the breaker for the main and a 20a side for the A/C.

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Old 02-06-2020, 09:35 AM   #3
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It does seem odd that it would not be a 30/20 tandem breaker rather than two 20s since the air conditioner alone is on 20... I wonder if a previous owner swapped it out after some issue and installed the incorrect size 'Main Breaker'?

but, other older trailer owners might have more knowledge of whether this is 'normal' for that timeframe, or not...

also, regardless of whether you have a 30amp shore cord and are plugged into a 30amp RV service outlet, this 20amp Main Breaker will continue to limit you to 20amps at 120v of power usage.
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Old 02-06-2020, 09:55 AM   #4
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I would unplug the unit and remove that cover to see what is there. It is possible they couldn't find the correct breaker and bypassed it some how. Which could be worse then limiting you to 20 amps.
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Old 02-06-2020, 10:25 AM   #5
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That power panel normally comes with a 30/?? amp main breaker. Normally a 30/15 or a 30/20. My guess is that the original owner or some repairman was having trouble with it and they couldn't find a 30/20 so they just installed what they could find.

Open up the panel and if everything is intact (wiring etc.) just get a 30/20 tandem breaker and replace that 20/20.
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Old 02-06-2020, 11:59 AM   #6
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Thank you for the quick responses, much appreciated. I am glad to hear that this doesn't look correct to others, I will remove the cover and see what is going on. I guess it is possible this convertor was replaced at one time and these were the only breakers they could find.
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Old 02-06-2020, 05:18 PM   #7
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Code requires the following size wiring as minimum:

15 AMP = 14 Gauge
20 Amp = 12 Gauge
30 AMP = 10 Gauge

If the wire size feeding the left side portion of the 20/20 breaker (From the 30 AMP "Shore Power" input) is obviously thicker than all the other wires that connect to the other breakers, then it is probably 10 gauge and you can use a 30 AMP breaker for that circuit.
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