For some reason my microwave has no power when I have the generator powered up, but it works fine when I am plugged into shore power.I don't recall having this issue last year (we have had the rig about a year now) but I also don't recall using the micro when the generator is running. We did use the AC last summer with no issues.Am I missing something? Is there a switch that's not flipped?Thanks for your replies.

Does everything else work on gen?

Severe lack of information provided...

Have you checked the voltage at the receptacle for the microwave when on generator? Maybe plugged a lamp into the receptacle.

It's not the voltage but an amperage problem with a microwave. Some will pull 25 amps. It should say in the microwave owners manual. That's why they are on dedicated circuits.

Start by turning off and back on the two on-generator breakers. One may be tripped.

Microwave Not Working on Generator Power | Good Sam Community

13 Replies

patrick_
Explorer
May 23, 2014
Thanks for your replies. Found a breaker on the generator tripped. Didn't even realize they were there.
tenbear
Explorer
May 23, 2014
I would be interested in knowing if other 120vac things still have power when on the genny and the microwave is turned on but doesn't work. Are the receptacles still powered up? Does the refrig switch to gas?
Wind_River
Explorer
May 23, 2014
If you have power to the receptacle the microwave is plugged into, turn the refrigerator to gas and see if the microwave will work. Just a thought.
mikestock
Explorer
May 22, 2014
sharker6 wrote:
Some will pull 25 amps.

If your microwave pulls 25 amps you need to replace it. That's 3000 watts. Never seen one that pulls this much.
dougrainer
Nomad
May 22, 2014
sharker6 wrote:
It's not the voltage but an amperage problem with a microwave. Some will pull 25 amps. It should say in the microwave owners manual. That's why they are on dedicated circuits.

No RV micro/convection oven pulls more than 11 to 13 amps. AMPERAGE is horsepower. Nothing else. The Op's problem is a problem with the APU voltage and the APU frequency (Htz). He needs to check the voltage AND the frequency. Freg should be 60 Htz. There is no way an appliance can "see" Amperage. Amperage is the work it pulls (horsepower). Doug
MrWizard
Moderator
May 22, 2014
what size generator
how many cooking watts MW ?

my MW uses more power than the A/C

my MW is 1100 cooking watts, pulls 1650w power from generator

a 2000w peak 1700w continuous genset, will barely run my MW..provided everything thing else is turned off, converter, tv fridge, anything that uses 120v must be off

thats why i have a 3100w generator
Peg_Leg
Explorer
May 22, 2014
Don't know what size generator you have.

Did the microwave have no power as in no lights? Check 120v circuit breaker.

Was: the fridge on auto?
the water heater on elec?

Were your batteries low? The converter could have been throwing a lot of amps at the batteries.

A lot of variables that require more information to properly diagnose.
ksg5000
Explorer
May 22, 2014
Maybe your generator is too small to power microwave. More details please.
wolfe10
Explorer
May 22, 2014
Start by turning off and back on the two on-generator breakers. One may be tripped.
sharker6
Explorer
May 22, 2014
It's not the voltage but an amperage problem with a microwave. Some will pull 25 amps. It should say in the microwave owners manual. That's why they are on dedicated circuits.