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07-26-2019, 09:23 AM
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#1
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2 Rivet Member
2006 30' Land Yacht 30 SL
Kendalia
, Texas
Join Date: Mar 2019
Posts: 35
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Roof AC Tripping Generator 30 AMP 20 AMP OK
2005 Land Yacht 30 ft 50 AMP service
30 amp trips after approx. 5 min of cooling 85 outside temp, will run longer in cooler temp - front ac unit
20 amp does not - rear ac keeps cooling
When on shore power AC runs no problem
Would replacing breaker on generator be the best place to start as to fixing problem
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07-26-2019, 09:30 AM
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#2
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Half a Rivet Short
2017 30' Classic
2022 Interstate 24X
Carlisle
, Pennsylvania
Join Date: May 2017
Posts: 15,744
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Hi
Best bet is the A/C unit is not in good shape.
Bob
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07-26-2019, 11:32 AM
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#3
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2 Rivet Member
2006 30' Land Yacht 30 SL
Kendalia
, Texas
Join Date: Mar 2019
Posts: 35
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Thanks Bob
Having "limited" knowledge on electrical and how it works - I shall ask
If it does not trip the breaker on the inside panel when attacked to shore power why would it then trip the generator breaker when not using shore power - both 30 amp
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07-26-2019, 11:48 AM
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#4
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3 Rivet Member
1988 Argosy 32
Lomita
, California
Join Date: Aug 2012
Posts: 181
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a clamp on amp meter will tell the tail, or you can PPC it, (pro parts changer)
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07-26-2019, 11:58 AM
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#5
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Rivet Master
1992 36' Land Yacht
Grayson
, Georgia
Join Date: Nov 2011
Posts: 1,724
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Make sure that the generator is putting out the correct voltage. Low voltage can cause the AC to run less efficiently and use more current. Many AC's have a low voltage alarm but not all.
When you say the 30 amp breaker blows but not the 20, than I'm assuming you're talking about the breakers directly on the generator. Is this correct?
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07-26-2019, 12:45 PM
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#6
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2 Rivet Member
2006 30' Land Yacht 30 SL
Kendalia
, Texas
Join Date: Mar 2019
Posts: 35
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Yes the 30 on the generator the 20 does not trip
It will run with both AC units cooling but the front AC which is on the 30 will trip after about 5 to 10 min
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07-26-2019, 12:50 PM
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#7
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2 Rivet Member
2006 30' Land Yacht 30 SL
Kendalia
, Texas
Join Date: Mar 2019
Posts: 35
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More info - I turn the 20 off at the generator and the 30 will still trip after the same time period
No appliances on in the coach, no lights
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07-26-2019, 12:59 PM
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#8
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Rivet Master
1977 Argosy Minuet 6.0 Metre
1973 21' Globetrotter
1975 26' Argosy 26
Vista
, California
Join Date: Sep 2006
Posts: 589
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Is the fridge set to gas? Also try unplugging the charger/converter. Does the water heater also use 120v?
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07-26-2019, 02:36 PM
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#9
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Rivet Master
1992 36' Land Yacht
Grayson
, Georgia
Join Date: Nov 2011
Posts: 1,724
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Turning that on or off will have no effect. You need to still verify voltage and current on that line. You'll need a digital multi-meter that has a current sensing clamp. You can pick them up pretty inexpensively now. Even Home Depot has them for around $59.00:
https://www.homedepot.com/p/Klein-To...L210/207144572
All you have to do to make a current reading is to put the clamp around the hot wire (black) and set the scale to read AC Amps. No need to probe anything. Voltage reading is easy as well. Set the meter to read AC volts ~ and then probe a socket that's on that breaker. The meter will auto range and give you an accurate reading.
I personally wouldn't travel without one.
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07-26-2019, 03:42 PM
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#10
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2 Rivet Member
2006 30' Land Yacht 30 SL
Kendalia
, Texas
Join Date: Mar 2019
Posts: 35
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Thanks for all the info - something to do tomorrow and somethings else to buy
Yall have a good weekend
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07-26-2019, 03:47 PM
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#11
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Rivet Master
1992 36' Land Yacht
Grayson
, Georgia
Join Date: Nov 2011
Posts: 1,724
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Quote:
Originally Posted by 1956elli
Thanks for all the info - something to do tomorrow and somethings else to buy
Yall have a good weekend
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Welcome to the world of owning an RV. Seems like there's always something to do or buy.
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07-26-2019, 03:56 PM
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#12
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Rivet Master
2007 22' International CCD
Corona
, California
Join Date: Jul 2013
Posts: 9,180
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Yeah, stay away from the “What did you get for your Airstream today” thread. Gets me in trouble every time.
__________________
Rich, KE4GNK/AE, Overkill Engineering Dept.
'The Silver HamShack' ('07 International 22FB CCD 75th Anniversary)
Multiple Yaesu Ham Radios inside and many antennae sprouting from roof, ProPride hitch, Prodigy P2 controller.
2012 shortbed CrewMax 4x4 Toyota Tacoma TV with more antennae on it.
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07-26-2019, 05:53 PM
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#13
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Rivet Master
1964 22' Safari
modesto
, California
Join Date: Jul 2010
Posts: 1,097
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Just a quick couple questions.
What make and model of generator are you using?
Have you used this generator before with this trailer and both AC's running?
-Dennis
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07-26-2019, 07:34 PM
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#14
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2 Rivet Member
2006 30' Land Yacht 30 SL
Kendalia
, Texas
Join Date: Mar 2019
Posts: 35
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Purchased this past February and yes we ran the generator and both AC units for about 20 min. but it was a lot cooler then and no problems
Other trips I have only used shore power because it was cool enough while driving with dash AC
ONAN 5.5HGJAB-901C Per "sticker" 45.8 Amps 5.5 KW
Hay - I have plenty of experience buying STUFF - also got boat & WIFE
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07-26-2019, 08:00 PM
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#15
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Rivet Master
2002 30' Classic S/O
Fleming Island
, Florida
Join Date: Nov 2013
Posts: 4,673
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Is your generator gasoline or propane? The gasoline version has a mechanical governor that may need adjustment. Also the carburetor has an altitude adjustment.
Al
__________________
“You cannot reason someone out of a position they have not been reasoned into"
Al, K5TAN and Missy, N4RGO WBCCI 1322
2002 Classic 30 Slideout -S/OS #004
2013 Dodge 2500 Laramie 4x4 Megacab Cummins
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07-26-2019, 08:02 PM
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#16
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Rivet Master
Currently Looking...
_
, _
Join Date: Mar 2008
Posts: 2,385
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If the A/C is working fine on shore power, then I'm going to also guess that the GenSet is not putting out the correct voltage. See the post I wrote below...
http://www.airforums.com/forums/f311...ml#post2263689
__________________
May a Firefly land upon your shoulder
and bring you good luck, good fortune, and abundance.
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07-27-2019, 07:00 AM
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#17
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Half a Rivet Short
2017 30' Classic
2022 Interstate 24X
Carlisle
, Pennsylvania
Join Date: May 2017
Posts: 15,744
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Hi
Never rule out a defective breaker
The "measure it" advice is really the only way to go. Otherwise you just start randomly swapping parts out. That gets expensive if the A/C is the first thing you swap ....
One thing to watch for as you go shopping:
Clamp on amp meters come in various ranges and types.
Most are designed to look at a whole house at once. Some have a 400A range and that's it. You will *never* need to measure 400A of AC current in an RV. If the "bottom end" of that scale is 4A, that's not real good. Take a look at how it does on low currents.
You can get AC only gizmos and they have been around for a *long* time. I have a couple with ... errr ... analog needle displays .... yikes !!! These days you can also get ones that will do both AC *and* DC. For an RV, that is a very handy thing. You are just as likely to be playing with 12V DC as with 120V AC. The same "current range" thing applies here as well.
A handy accessory for the AC version is a little inline plugin device. It lets you put it inline with an appliance. You can then clamp on to the (now accessible) lines to the device. The really cool ones have a 10X side that helps with the range on the amp meter. Even the fancy ones are dirt cheap. Yes, you can also make one from scratch.
If you go crazy, you can indeed spend a lot of money on this stuff. One example:
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
(Yes, there's one sitting in the drawer over under the fridge. There's also a digital oscilloscope and a 5 1/2 digit DVM in the wardrobe closet .... crazy indeed ....)
Bob
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07-27-2019, 08:11 AM
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#18
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Rivet Master
2012 25' FB International
Trent Woods
, North Carolina
Join Date: May 2013
Posts: 3,120
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"A handy accessory for the AC version is a little inline plugin device. It lets you put it inline with an appliance. You can then clamp on to the (now accessible) lines to the device. The really cool ones have a 10X side that helps with the range on the amp meter. Even the fancy ones are dirt cheap. Yes, you can also make one from scratch."
Thanks, I never knew those things existed although the use seems limited, first to something in a normal AC circuit limited to 15 amps. Seems like I would use my clamp-on more for stuff that is not or does not plug in to a normal outlet.
Larry
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07-27-2019, 08:16 AM
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#19
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Half a Rivet Short
2017 30' Classic
2022 Interstate 24X
Carlisle
, Pennsylvania
Join Date: May 2017
Posts: 15,744
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Quote:
Originally Posted by lsbrodsky
"A handy accessory for the AC version is a little inline plugin device. It lets you put it inline with an appliance. You can then clamp on to the (now accessible) lines to the device. The really cool ones have a 10X side that helps with the range on the amp meter. Even the fancy ones are dirt cheap. Yes, you can also make one from scratch."
Thanks, I never knew those things existed although the use seems limited, first to something in a normal AC circuit limited to 15 amps. Seems like I would use my clamp-on more for stuff that is not or does not plug in to a normal outlet.
Larry
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Hi
Indeed the standard cheap gizmo is a "plug into a 15A outlet" sort of thing. The main use is checking things like fans, coffee grinders, wall chargers, .... to see how much they pull. Comes in handy when you are trying to sort out what will and won't work (and in what combinations) with your inverter.
Since all you are doing is putting a few coils of wire "inside" the clamp, there is no reason you can't use the same trick in other settings. You *do* need to have enough wire to make the loops and it has to be flexible enough.
Bob
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07-27-2019, 09:05 AM
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#20
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3 Rivet Member
2018 25' International
Mound
, Minnesota
Join Date: Oct 2018
Posts: 236
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Quote:
Originally Posted by uncle_bob
[...]
A handy accessory for the AC version is a little inline plugin device. It lets you put it inline with an appliance. You can then clamp on to the (now accessible) lines to the device. The really cool ones have a 10X side that helps with the range on the amp meter. Even the fancy ones are dirt cheap. Yes, you can also make one from scratch.
Bob
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Could you give an link to a decent one online?
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