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Old 12-28-2016, 04:53 PM   #1
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Air Cond surge - dim lights ?

2013 Berkshire. Main living area issue with air conditioning.. ... comes on and works fine for 30-40 seconds then powers down low (doesn't shut off) and lights go dim for about 4-5 seconds. This just repeats over and over. Makes me nervous so I just shut it down. Anyone have any ideas what would cause this?

Thanks,
Marilyn
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Old 12-28-2016, 04:58 PM   #2
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How about a little more info as to what you are using for power. Gen or shore power. Later RJD
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Old 12-28-2016, 05:07 PM   #3
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Sorry.... on 50amp plugged in to rv park electric. Been here several months. No other appliances on other than lights
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Old 12-28-2016, 05:47 PM   #4
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Originally Posted by FreeBird View Post
2013 Berkshire. Main living area issue with air conditioning.. ... comes on and works fine for 30-40 seconds then powers down low (doesn't shut off) and lights go dim for about 4-5 seconds. This just repeats over and over. Makes me nervous so I just shut it down. Anyone have any ideas what would cause this?

Thanks,
Marilyn

It's normal the voltage drops for a short time when a large load is applied. In this case sounds as though it's excessive if the converter input"AC" and output "D.C." Both drop even with batteries on line?
My first guess would be the air cond compressor draws excess AC current on start up. This can be confirmed using a multimeter watching voltage to any AC receptacle while starting the a/c unit.


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Old 12-28-2016, 06:09 PM   #5
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Do you have a surge supressor like a Progressive? If so, it could be detecting a problem with the campground pedestal you are plugged into or their power supply. I have had this happen at several campgrounds where the surge supressor will shut the power down because it detected a low voltage condition. It would then cycle on for a short time until there is another power draw.
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Old 12-28-2016, 06:57 PM   #6
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Do you have a surge supressor like a Progressive? If so, it could be detecting a problem with the campground pedestal you are plugged into or their power supply. I have had this happen at several campgrounds where the surge supressor will shut the power down because it detected a low voltage condition. It would then cycle on for a short time until there is another power draw.
X2 - are you using a EMS? Also I recommend a Hughs Autoformer - this should take care of all your power problems!
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Old 12-28-2016, 10:05 PM   #7
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Yes we have a surge protector between the campground plug in and our Rv plug. No problem there. We have had this diesel pusher Rv since 2013. Bought it new It's like the air conditioner is trying to work but gets some kind of interruption then tries again. Over and over about every 30-45 seconds. It is blowing cold air. It's the lights dimming that freaked me out which is why I shut it down. Cool weather right now thank goodness. Not looking forward to another trip to the shop.
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Old 12-28-2016, 10:20 PM   #8
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Check the plug at the pedestal. If you can, safely tighten the connections in the power box. Look for a bad connection on the input terminals. A bad connection could also be in the pedestal or further back in the distribution system.

Or, the compressor is trying to start without timing out...allowing the system to decompress. This condition will pull excessive amps normally tripping the circuit breaker.

The dimming of lights indicate a low voltage situation. Everything above will cause low voltage.

One last thing, an arcing (bad) connection is a Fire Hazard.

Just my thoughts.
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Old 12-29-2016, 03:13 AM   #9
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X2 - are you using a EMS? Also I recommend a Hughs Autoformer - this should take care of all your power problems!
A lot or people do not like the idea of floating the cabbage for both of those but IMO they both should be purchased before a sewer hose or anything else. Replacing your AC or converter is much more expensive than pooping your pants. Park power, either private or public is a crap shoot 95% of the time. Typically the older the system, which is easy to determine as all you have to do is look at the pedestals and such to tell, is going to have more electrical issues. It usually changes with the occupancy rate. It's only going to get worse as public facilities spend money on stupid crap before infrastructure, and private places would rather put in water slides or bingo halls.
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Old 12-29-2016, 03:42 PM   #10
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A lot or people do not like the idea of floating the cabbage for both of those but IMO they both should be purchased before a sewer hose or anything else. Replacing your AC or converter is much more expensive than pooping your pants. Park power, either private or public is a crap shoot 95% of the time. Typically the older the system, which is easy to determine as all you have to do is look at the pedestals and such to tell, is going to have more electrical issues. It usually changes with the occupancy rate. It's only going to get worse as public facilities spend money on stupid crap before infrastructure, and private places would rather put in water slides or bingo halls.
OMG you are FUNNY

I love reading your posts!

Oh and X2 -- even my fancy-schmanzy $150 WasteMaster is a 10th the price of a replacement 15K A/C with heatpump!
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Old 12-29-2016, 04:01 PM   #11
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X2... on our maiden voyage home....no EMS found 2 bad pedestals in 4 parks....not too good of odds. One sizzled when I plugged in and one only lit up one light on power cable. I talked to Jesus a lot when connecting.


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Old 12-29-2016, 06:56 PM   #12
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Try running generator and see if the same thing happens that should let you know if problem is internal power problem or external. Then go from there. Just a thought.
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Old 12-29-2016, 07:27 PM   #13
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It seems to me when the AC come on, first its fan only, then the compressor and large load starts. But, if this causes DC lights to dim; if they are not AC lights, the battery must be low as well. It sounds like they are depending on the converter. More info needed.
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Old 12-29-2016, 07:30 PM   #14
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Two things to check,

Battery disconnect switch turned on, this would mean you converter is dropped and causing the dim lights.

Second thing is a bad connection somewhere, check you power plug and as others have mentioned check with generator running. This will isolate the fault to possible power source issue.
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Old 12-29-2016, 09:01 PM   #15
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Freebird - it sounds like the compressor is going off on thermal overload due to it not being able to start. Put a hard start on it and it may work as I am assuming all was working well prior to this , as you have been on site for awhile.
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Old 12-29-2016, 10:30 PM   #16
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Freebird - it sounds like the compressor is going off on thermal overload due to it not being able to start. Put a hard start on it and it may work as I am assuming all was working well prior to this , as you have been on site for awhile.

Freebird unless you are going on the roof to troubleshoot this machine, we (the above post) agree the trouble is probably with the compressor it means the machine is most likely beyond economical repair. You can get a Refrig repair man to come out to confirm this and the call will be part of the repair/ replace cost. If it is salvageable. Need to ask yourself what's next.


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Old 12-29-2016, 11:06 PM   #17
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No one has used the word "capacitor" yet......

Compressors/motors that have to reach deep to (just) fire up may have capacitors that are not helping enough.....

They are cheap and easy to replace, so if that is your problem you'll be in luck.
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Old 12-30-2016, 03:33 PM   #18
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x2 on #17. Don't spend money until the problem is found if not you, then a pro.
Findng a pro, well that is another matter
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Old 12-30-2016, 10:03 PM   #19
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2013 Berkshire. Main living area issue with air conditioning.. ... comes on and works fine for 30-40 seconds then powers down low (doesn't shut off) and lights go dim for about 4-5 seconds. This just repeats over and over. Makes me nervous so I just shut it down. Anyone have any ideas what would cause this?

Thanks,
Marilyn
Just that a/c unit or the one in the bedroom as well? If it is only the one a/c unit having that issue, I think you can pretty much find the problem there.


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