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 02-27-2021, 10:11 AM   #1
Junior Member
 
Join Date: Jul 2017
Posts: 20
Microwave turns off what am I missing!!???

Trying to figure this out. 99 Ultimate Freedom, generator is an Onan 7500 QD. When running the microwave (850 watt) it will shut off here and there. Iíll have the fridge on gas, inverter is a 2000 watt. So there is the batteries being charged to add to the usage. We wonít have multiple things plugged in and going at once and the sucker will turn off. What am I missing???
slddnmatt 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 02-27-2021, 10:22 AM   #2
Senior Member
 
Ljwt330's Avatar
 
Join Date: Jan 2018
Location: Capistrano Beach, California
Posts: 2,987
Quote:
Originally Posted by slddnmatt View Post
Trying to figure this out. 99 Ultimate Freedom, generator is an Onan 7500 QD. When running the microwave (850 watt) it will shut off here and there. I’ll have the fridge on gas, inverter is a 2000 watt. So there is the batteries being charged to add to the usage. We won’t have multiple things plugged in and going at once and the sucker will turn off. What am I missing???
It's not clear as to under what circumstances the microwave shuts off, and whether or not it comes back on without you resetting something. For example, is the micro being used with the inverter only, or is the generator also running when the shut off happens? Do you need to reset anything to get the micro to come back on?

Personally, I couldn't figure out the situation you describe. If the micro shuts off when on inverter only, it's probably a battery issue and the inverter automatically shuts down the AC. How old are your batteries? If the micro shuts off when you have the generator running, something else is going on as the gen should be supplying 120v AC directly to the micro.
__________________
Larry, Eileen, and Finley
2004 Alpine 36FDDS
Third motor home, first Alpine, no need for another.
Ljwt330 is offline   Reply With Quote
Old 02-27-2021, 10:45 AM   #3
Junior Member
 
Join Date: Jul 2017
Posts: 20
Just boondocking with the Generator running. No issues when plugged into shore power. Microwave will turn off, acts like the generator is over burdened I guess and will turn the microwave off. Will have to hit start again.
slddnmatt is offline   Reply With Quote
Old 02-27-2021, 11:36 AM   #4
Senior Member
 
Join Date: Jul 2014
Posts: 26,791
You may need a fuel filter on the generator, if its stumbling under load.

Have you tried turning on an AC or electric heater with generator running ?
twinboat is offline   Reply With Quote
Old 02-27-2021, 11:47 AM   #5
Community Moderator
 
CountryFit's Avatar


 
Join Date: Sep 2011
Location: Between the Oceans
Posts: 7,197
Blog Entries: 4
Without knowing the details about your microwave, a likelihood of the cause is that your microwave draws too much current (faulty) dragging down the voltage that triggers the ATS' low voltage protection.

I'd suggest troubleshooting from here -
Measure the wall outlet voltage (where mw plugs in) with a voltmeter (a function of multimeter) to detect if the voltage is suddenly dropped to below than 90v before the mw off. (Also observe if the power is back within 2-4 minutes after the incident.)

This will tell you the probable cause of the problem on mw or a weak genset.
__________________
Steven & Polly
2000 Country Coach Intrigue 40' with ISC 350
2014 Ford C-Max Energi
CountryFit is offline   Reply With Quote
Old 02-27-2021, 12:53 PM   #6
Senior Member
 
Unplanned Tourist's Avatar
 
Winnebago Owners Club
Workhorse Chassis Owner
Join Date: May 2016
Location: Kamloops, BC, 60 miles from the Center of the Universe
Posts: 4,828
Do you have an ATS (Auto Transfer Switch) in your inverter system? It may not be transfering over to the power from the genset, and battery voltage is dropping enough to shut down the inverter. Watch your battery voltage as you run the microwave.

Just a guess.
__________________
Happy Glamping, Norman & Elna. 2008 Winnebago Adventurer 38J, W24, dozens of small thirsty ponies. Retired after 40 years wrenching on trucks! 2010 Ford Ranger toad with bicycles or KLR 650 in the back. Easy to spot an RVer, they always walk around with a screwdriver or wrench in one hand!
Unplanned Tourist is offline   Reply With Quote
Old 02-27-2021, 12:53 PM   #7
Member
 
Skyline Owners Group
Join Date: Nov 2020
Posts: 60
2000 watt inverter may be the surge rate, 1600 constant is avg if thats the case. my "800W Microwave" uses 1300W input (max), yous will be even higher likely. Add propane refig. solenoid wattage, plus lighting, safety monitors like CO and propane. parasitic lodes from all led indicator lights, standby on electronics and losses due to distance of wiring and older connections getting a little tarnished mean what may have worked won't now... It sounds pretty very close to maxxed out....

A simple step up to a pure sine wave 2500w inverter. may do the trick.

or..

Panasonic sells inverter microwaves that draw less current vs the cooking output. They are popular among solar campers for that reason.
__________________
1997 Skyline, Layton 1950, Pulled by a 2002 Tahoe LS.
Terrapin is offline   Reply With Quote
Old 02-27-2021, 04:19 PM   #8
Junior Member
 
Join Date: Jul 2017
Posts: 20
Voltage stays at about 118.6 measured at the wall. Drops to 114.6-114.8 with microwave running. Microwave is a sharp 1850-A convection oven. Load rating on my AC line 4 and 16 when microwave is running
Attached Thumbnails
Click image for larger version

Name:	2A12EFD6-DA20-409B-B5C1-C00ACFF7645F.jpg
Views:	4
Size:	246.9 KB
ID:	319530   Click image for larger version

Name:	9B461024-7350-4FBF-AE3C-1B446733EDB0.jpg
Views:	4
Size:	273.2 KB
ID:	319531  

slddnmatt is offline   Reply With Quote
Old 02-27-2021, 05:00 PM   #9
Senior Member
 
curtsr's Avatar
 
Tiffin Owners Club
Join Date: Nov 2014
Posts: 384
Are you shore its not a problem with the microwave? Try keeping your meter connected to the outlet and see if the voltage drops when the microwave stops. If the voltage doesn't drop it is probably a problem with the microwave.
curtsr is offline   Reply With Quote
Old 02-27-2021, 05:32 PM   #10
Junior Member
 
Join Date: Jul 2017
Posts: 20
Voltage stays fine. We can be running the tv or whatever and maybe turn on something else like the water heater and it might kill the power to the appliances. Generator runs great
slddnmatt is offline   Reply With Quote
Old 02-27-2021, 07:29 PM   #11
Senior Member
 
FIRE UP's Avatar


 
Join Date: Dec 2009
Location: Out there, somewhere
Posts: 8,791
Ok,
Let's analyze this.

1. You say you have no issues with the microwave when you're on SHORE POWER, correct?
2. When your gen is running, it's the same as shore power. Your micro SHOULD NOT BE ON THE INVERTER when the gen is running. The gen provides 120VAC, through whatever kind of transfer switch you have, to the 120VAC panel. From there, it goes to all the outlets, just like shore power.
3. Have you *timed* the microwave shut-down, from the start when you push the START button, to the time it shuts down?
4. Does it shut down at or very near, the same amount of time it's been running, each time it shuts down?


There have been a few microwaves, such as the one we have, that is a microwave/convection over, that had the infamous *59 second* disease. That is, we'd hit the START button and, it would cook whatever we had in there, for 59 seconds, EVERY TIME! And then it would shut down. Hit the START button again, and it would shut off at 59 seconds.

Well, a tad bit of research on here, revealed that we were not alone in this dilemma. There is/was a cure for this disease. It was about, oh I don't remember but, maybe somewhere around $39 or so for a specific part. Once that part was installed, all was/is well again and it cooks for whatever length of time we program it to.

Now, is this your problem, not a clue. But, as I asked, does it shut down at the same amount of time from the START, to the point of shut-down, each and every time?
Scott
__________________
2004 ITASCA HORIZON 36GD, 2011 GMC Sierra 1500 4x4 Toad '18 Honda Africa Twin Adventure Sports DCT
Retired-29.5 yrs, SDFD, Ham - KI6OND
Me, Karla and the Sophie character, (mini Schnauzer)
FIRE UP is offline   Reply With Quote
Old 02-27-2021, 07:30 PM   #12
Senior Member
 
Damon Owners Club
Join Date: Apr 2020
Posts: 1,442
Blog Entries: 3
When you say the microwave shuts off, do you mean it stops cooking, or the display goes blank? There is a difference. You indicated that you just need to hit start again, which indicates a problem with the microwave, and not the power going to it.
__________________
2006 Damon Daybreak 3276 35'with 5 Star Tuner. 3 200 Amp Lithium batteries and 2000 watt Pure wave inverter/charger. 2013 Elantra on a Master Tow dolly.
Retired AF
HarryStone is offline   Reply With Quote
Old 02-27-2021, 08:34 PM   #13
Junior Member
 
Join Date: Jul 2017
Posts: 20
It’s not consistent as far as time. When I ran it earlier to watch it, I put it on for 3 minutes. Turned off in a couple minutes. Next time I ran it for 5 and it ran the whole 5 minutes..��*♂️
slddnmatt is offline   Reply With Quote
Old 02-27-2021, 09:07 PM   #14
Senior Member
 
Ray,IN's Avatar
 
Join Date: Aug 2001
Location: North America somewhere
Posts: 21,999
Quote:
Originally Posted by Layton1950 View Post
2000 watt inverter may be the surge rate, 1600 constant is avg if thats the case. my "800W Microwave" uses 1300W input (max), yous will be even higher likely. Add propane refig. solenoid wattage, plus lighting, safety monitors like CO and propane. parasitic lodes from all led indicator lights, standby on electronics and losses due to distance of wiring and older connections getting a little tarnished mean what may have worked won't now... It sounds pretty very close to maxxed out....

A simple step up to a pure sine wave 2500w inverter. may do the trick.

or..

Panasonic sells inverter microwaves that draw less current vs the cooking output. They are popular among solar campers for that reason.
Ultimate Freedom MH's came with a Xantrex RS2000 pure sine wave inverter, 2000W is constant output, surge is 3000W. I too suspect the genset is the root cause.
__________________
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 online now   Reply With Quote
Reply

Tags
microwave



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
On-off on off on off off off rear view camera Bahcml Newmar Owner's Forum 5 08-12-2019 10:44 PM
Powergear Jacks Alarm goes off when jacks are up and turns off when they are down. Honey_Hole National RV Owner's Forum 9 01-12-2016 08:37 PM
Whirlpool washer turns on lights flash then turns off SuzzyQ Entegra Owner's Forum 17 06-21-2015 07:46 AM
W22 8.1L Engine cuts off in left turns my2kids330 Workhorse and Chevrolet Chassis Motorhome Forum 15 07-06-2007 11:13 AM


All times are GMT -6. The time now is 01:10 PM.


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