Furnace resets the Microwave

[luv2rid]

I am having an odd problem, or at least from my understanding it is an odd problem.

Every once in a while, when the furnace kicks on it seems to overload the 120V systems. The microwave and other items turn off, which is controlled by the 120V control panel.

From my understanding, the furnace should be propane for heat and 12V for the blower motor, so I cannot figure out how/why it would affect the 120V systems.

Any ideas?

Thanks

[RJay]

The 12 volt system is indirectly fed by the inverter(battery charger) which is fed from the 120 volt AC source. The fan motor draws much more current on start than when running. The initial draw could be enough for the power control panel to trip the microwave.

[wa8yxm]

That is one posibility.. the other is this.. I gather you have an EMS (energy management system) I do not know, but strongly suspect that SOME of these rely on the 12 volt system to power their computer.

When the voltage goes too low,, the computer says "Good by" and shuts off power for a bit.

Suggestion: Clean battery connections, check grounds on the main battery cables (By main I mean house batteries of course)

[M&EM]

Quote:

Originally Posted by luv2rid I am having an odd problem, or at least from my understanding it is an odd problem. Every once in a while, when the furnace kicks on it seems to overload the 120V systems. The microwave and other items turn off, which is controlled by the 120V control panel. From my understanding, the furnace should be propane for heat and 12V for the blower motor, so I cannot figure out how/why it would affect the 120V systems. Any ideas? Thanks

not enough info!

Is there shore power? Are you dry camping and running an inverter for the 120V?
Is the coach battery system charged and in good condition?

I would only be guessing and assuming you are running an inverter on lowly charged batteries and it senses too low a voltage at the time the furnace starts up. That could cause the inverter to shut down as it is sensitive to battery voltage.

Try to add more info about your rig and operating conditions when this happens.

Marty

[luv2rid]

Thanks for the assistance. Sorry, I'm new at this and forget that the details are important.

I was connected to shore power. My rig operates on 30 amps, so it is definitely limited. I have a 70 amp Inteli-Power converter, that I recently installed, and two 6-volt deep cycle batteries that are a little over a year old. According to the charge wizard on the Inteli-Power, the batteries were fully charged. I also checked the shore power and it was clean.

I do suspect that I need to redo my connections from the converter to the batteries. I ran 8 gauge wire but the lugs that connect the converter to the battery posts are fairly thin.

I do have an EMS and I am pretty sure it is turning off the microwave because I sometimes get an error condition on the EMS but not always. I watched the EMS and it never showed more than approximately 15 amps was being used when the issue occurred. I understand that if it was quick enough, it would never show up, so that is a definite possibility.

I did have this same problem before I installed the converter as the heater drew down the batteries. When I originally bought the motorhome, they had a small battery charger connected to the batteries, which couldn't keep up. I was hoping the converter would solve this issue.

Thanks for all your help.