Free 7 Day Trial RV GPS App RV Trip Planner Campground Reviews RV Maintenance Free 7 Day Trial ×
RV Trip Planning Discussions

Go Back   iRV2 Forums > MOTORHOME FORUMS > Class A Motorhome Discussions
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
 
Thread Tools Search this Thread Display Modes
 
Old 03-27-2021, 03:39 PM   #15
Senior Member
 
Join Date: Sep 2019
Location: Markham ON
Posts: 117
Quote:
Originally Posted by rssnape View Post
Try a soft starter for your air conditioner. One trick I would use if I only had 30 amp available is stagger the set points about 2 degrees F. That almost always keeps the airs from starting at the same time.
Here is a link to the video I made of the soft starter I used for my 3 ton unit at home.
https://youtu.be/CDSJrGnxlMM
There is also
https://www.microair.net/collections...-soft-starters
+1. Soft starters make all the difference in the world.

Of course, the final load with both A/Cs running will be significantly increased and therefore, you'd be shorted for running other appliances and devices.
__________________
1999 GBM CruiseMaster
Toad: None (yet!)
uchu is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 03-27-2021, 03:53 PM   #16
Senior Member
 
Join Date: Jul 2014
Posts: 27,420
This 2013 RV ran like a dream for years.

NOW it needs Soft Starts ? Can you explain why it didn't need them for 9 years ?
twinboat is offline   Reply With Quote
Old 03-27-2021, 11:02 PM   #17
Senior Member
 
Ray,IN's Avatar
 
Join Date: Aug 2001
Location: North America somewhere
Posts: 22,729
Quote:
Originally Posted by twinboat View Post
This 2013 RV ran like a dream for years.

NOW it needs Soft Starts ? Can you explain why it didn't need them for 9 years ?
I suspect our advice has fallen on deaf ears.
__________________
2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA." My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
Ray,IN is offline   Reply With Quote
Old 03-28-2021, 06:19 AM   #18
Senior Member
 
rssnape's Avatar
 
Join Date: Oct 2011
Location: Central, SC
Posts: 429
Quote:
Originally Posted by twinboat View Post
This 2013 RV ran like a dream for years.

NOW it needs Soft Starts ? Can you explain why it didn't need them for 9 years ?


Since the OP didn’t specify what was “tripping, cutting off, etc” if there is no other problem it could be the starting amps of one or both of the airs. I’ve never heard of starting current going down as an electric motor ages.
As an example in the video I posted, the LRA of my 3ton compressor is 83, yet I measured 93 amps on start, 11% increase.

If both airs are trying to start with 11% increase and at the same time, while the water heater element is on, the coffee maker, etc. etc. all things being the same it could be enough to trip a breaker.

8000 watts is only 33 amps per leg. While it should be adequate, all the possibilities others have posted could contribute to the total load being elevated.

As someone posted, if the generator is shutting down there is something wrong with the generator.

But staggering starts and lowering starting current can only help.
rssnape is offline   Reply With Quote
Old 03-31-2021, 05:43 AM   #19
Member
 
Join Date: Jan 2021
Posts: 40
Turn each on on separately and observe your power draw on your main control station. It may show you have an issue with one of the AC units.
Caymanedge is offline   Reply With Quote
Old 04-01-2021, 05:39 PM   #20
Senior Member
 
KathyandMark's Avatar
 
Join Date: Oct 2015
Location: Orlando, FL.
Posts: 172
[QUOTE=twinboat;5688761]How are you losing power ?

You say the power shuts off, what does that mean.

If a breaker is tripping, its drawing to much power.
If the generator is shutting off, its a generator engine problem, most likely a fuel filter issue.

If you have a surge guard device, protecting the shore and generator input, and that's shutting you down, again more likely a generator engine issue.
Generator engines depend on clean and flowing fuel when a load is applied, just like the main engine.

Thank you, and here is more info on my issue.
The generator(5000 Watt Onan Gas) trips one of the 30 Amp breakers as soon as the second air conditioner compressor turns on. The two deep cycle house batteries are 3 yrs old, and the level checker on the inside control panel of the RV indicates that they are 3/4 charged, and they will no longer charge to 100 percent. I'm wondering if the batteries might be the issue.
__________________
2013 Forest River Georgetown 335DS. 35 ft. Full body paint. 2016 Can Am Spyder Toad.
Living the dream, in the entertainment industry, making a living in Orlando, Florida, and beyond.
KathyandMark is offline   Reply With Quote
Old 04-01-2021, 05:48 PM   #21
Senior Member
 
KathyandMark's Avatar
 
Join Date: Oct 2015
Location: Orlando, FL.
Posts: 172
Quote:
Originally Posted by rssnape View Post
Since the OP didn’t specify what was “tripping, cutting off, etc” if there is no other problem it could be the starting amps of one or both of the airs. I’ve never heard of starting current going down as an electric motor ages.
As an example in the video I posted, the LRA of my 3ton compressor is 83, yet I measured 93 amps on start, 11% increase.

If both airs are trying to start with 11% increase and at the same time, while the water heater element is on, the coffee maker, etc. etc. all things being the same it could be enough to trip a breaker.

8000 watts is only 33 amps per leg. While it should be adequate, all the possibilities others have posted could contribute to the total load being elevated.

As someone posted, if the generator is shutting down there is something wrong with the generator.

But staggering starts and lowering starting current can only help.
Mark and Kathy here, sorry to be late posting this, but we have been offline for a few days, in upper Florida getting our second Moderna Covid Vaccination. Anyway, here is our problem in a a nutshell:

The generator(5000 Watt Onan Gas) trips one of the 30 Amp breakers as soon as the second air conditioner compressor turns on. The two deep cycle house batteries are 3 yrs old, and the level checker on the inside control panel of the RV indicates that they are 3/4 charged, and they will no longer charge to 100 percent. I'm wondering if the batteries might be the issue. Thank you again for your info, we really appreciate it!
__________________
2013 Forest River Georgetown 335DS. 35 ft. Full body paint. 2016 Can Am Spyder Toad.
Living the dream, in the entertainment industry, making a living in Orlando, Florida, and beyond.
KathyandMark is offline   Reply With Quote
Old 04-01-2021, 05:54 PM   #22
Senior Member
 
Join Date: Jul 2014
Posts: 27,420
Turn off the other generator circuit breaker and see if the first AC runs or if the second one runs.

They both shouldn't be on the same breaker.

Bad batteries will make the charger work a little harder not not enough to trip a breaker with an AC on it.
twinboat is offline   Reply With Quote
Old 04-01-2021, 06:47 PM   #23
Senior Member
 
Ljwt330's Avatar
 
Join Date: Jan 2018
Location: Capistrano Beach, California
Posts: 3,336
Quote:
Originally Posted by twinboat View Post
Turn off the other generator circuit breaker and see if the first AC runs or if the second one runs.

They both shouldn't be on the same breaker.

Bad batteries will make the charger work a little harder not not enough to trip a breaker with an AC on it.
Agree^^.


Now that it is clear that a generator circuit breaker is tripping and the generator itself is not shutting down, follow the plan laid out by Twinboat and report back your results.
__________________
Larry, Eileen, and Finley
2004 Alpine 36FDDS
Third motor home, first Alpine, no need for another.
Ljwt330 is offline   Reply With Quote
Old 04-01-2021, 07:26 PM   #24
Junior Member
 
1RVVolunteer's Avatar
 
Join Date: Sep 2020
Posts: 3
[QUOTE=KathyandMark;5686767]Hi everybody,
Thank you in advance for your help.
We have a 2013 Forest River Georgetown, & it’s been a great rv for us. No problems. Our generator has 900 hrs on it, & the front air conditioner was replaced about a year ago, works like a dream, & so does our rear air conditioner. We are on the road now, & boondocking. When we turn on both air conditioners, the power shuts off & only the battery power works. So we’re can only use one of the 2 air conditioners. We keep up with matienance of the generator, oil changes, etc. Any idea what could be going on? Thank
1RVVolunteer is offline   Reply With Quote
Old 04-01-2021, 07:43 PM   #25
Junior Member
 
1RVVolunteer's Avatar
 
Join Date: Sep 2020
Posts: 3
[QUOTE=1RVVolunteer;5696818]
Quote:
Originally Posted by KathyandMark View Post
Hi everybody,
Thank you in advance for your help.
We have a 2013 Forest River Georgetown, & it’s been a great rv for us. No problems. Our generator has 900 hrs on it, & the front air conditioner was replaced about a year ago, works like a dream, & so does our rear air conditioner. We are on the road now, & boondocking. When we turn on both air conditioners, the power shuts off & only the battery power works. So we’re can only use one of the 2 air conditioners. We keep up with matienance of the generator, oil changes, etc. Any idea what could be going on? Thank


When electric items whether lightbulbs or any device is turned on there is a large surge of current through that device , then the current decreases and settles to a more stable state. I had the same problem with my rig. To combat the problem I installed slow start systems on both ACs. This causes the unit to start in two stages, the compressor, then the blower, therefore drawing less instant current. That solved my problem!
1RVVolunteer is offline   Reply With Quote
Old 04-01-2021, 07:55 PM   #26
Senior Member
 
Workhorse Chassis Owner
Join Date: Jul 2005
Location: USA
Posts: 1,083
My 2 pennies. Start the larger of the ac units with fan in lo speed mode. Only when this first AC unit begins throwing cold air, start the second or smaller AC unit, again, with fan on slow speed.
With both units running on slow fan you will have max dehumidification and will likely be just as comfortable. Enjoy and good luck!!!
__________________
TandW
TandW is offline   Reply With Quote
Reply

Tags
air, air conditioner, camping



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Two Air Conditioners Won’t Shut Off GKW Entegra Owner's Forum 12 12-07-2020 09:55 AM
Two Air Conditioners ducting together but separate temperatures? FLavionics Fleetwood Owner's Forum 7 01-04-2019 05:37 AM
Two Air Conditioners, or even three? Texastbird 5th Wheel Discussion 45 05-25-2017 10:11 AM
Energy Management System Versus Two Air Conditioners MN_Traveler Class A Motorhome Discussions 11 06-05-2013 04:10 PM
Are two 13.5M Air Conditioners Sufficient LK23 Newmar Owner's Forum 27 06-05-2011 07:22 AM


All times are GMT -6. The time now is 06:00 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2021, vBulletin Solutions, Inc.