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Old 12-18-2010, 08:12 PM   #1
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Inverter fuse trips?

So it's cold and we're sublimenting our heat with electric heaters. Two heaters (1500 watts on high) each pluged into different circuits. Works great except when Mo turns on the microwave. Not immediatly but soon it will trip the inverter fuse killing the 120 volt power in the rig. The pms still shows we have power but everything goes to 12v. I go out to the inverter and push bck in the pop out fuse and all is well again.
What happens here??? I need some education, please.

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Old 12-18-2010, 08:36 PM   #2
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First thing. If you can reset the "fuse" by pushing it in, it is not a fuse. It is a circuit breaker.

Next thing is even if you have the heaters plugged into a different sockets, they are most likely still on the same breaker. Your microwave is probably on the same 15 amp breaker so when you are at max with the heaters and you add the microwave, you have gone over the 15 amp limit of the breaker.

You should look at the electrical schematic to see how your 115 volt circuits are wired to see if you can effectively separate the heaters to different breakers.

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Old 12-19-2010, 08:18 AM   #3
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Hi mikenmo,
The inverter has a maximum amount of power it can handle. An easy check to see if there are other 120 VAC outlets one can use is to have the coach connected to shore power. Turn off the inverter at the breaker box. Take an appliance and plug it into all the 120 VAC outlets in your coach. Remember which outlets allowed the appliance to work. These outlets are powered directly from shore power (no inverter). Try to use these outlets when using high electric usage appliances.

For me, I have labeled the outlets that the inverter provides power to. When we use the electric heaters, I always us outlets powered directly by shore power.
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Old 12-20-2010, 10:00 AM   #4
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Most of your 120vac outlets are powered through the inverter, even when on shore power. Typically the inverter is limited to 30A total for all circuits and the breaker will trip if that is exceeded. The two 1500 watt heaters together draw nearly 30 amps, so most any extra load will trip the inverter breaker. The microwave is itself a big power draw, so the microwave and just one heater will come close to the 30 amp max or possibly even exceed it.
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Old 12-20-2010, 11:48 AM   #5
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Wife has the same problem.. The problem is this. She can't count to 2 and she does not understand the power flow in this rig.

Do this.. using a lamp (not the heaters) Check to see if the heater outlets are live on the inverter (Of course you likely know this cause if the inverter breaker tripping kills them then they are on the inverter)

A 1500 watt space heater (Standard size) is 1500/120 or 12.5 amps
Two of them is 25 amps.. If your inverter has a 30 amp breaker. then adding in the microwave (Another 10 amps or so) means CLICK

It's as easy as 1-2-3 Your load limit is 2 "Big Ticket" itemsand you are trying to run 3.

Solution 1:.. Make wife re-set the breaker when she forgets to kill a heater first

Solution 2: Move one (or better both) of the heaters to outlets NOT powered via the inverter

NOTE: the wireing in an RV is really not up to 1500 watt loads and plugging into standard RV outlets may cause issues (like hot wires)

NOTE: 2: I'm instaling a 2nd heavy duty outlet in my rig possibly today or tomorrow.. When plugged into 50 amps that will give me two outlets rated 20 amps,, More than enough for a 1500 watt heater.. Each will have it's own breaker and 12ga wires held firmly under genuine screws.. Not push in 14ga like the rest of the house.b
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Old 12-20-2010, 12:12 PM   #6
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I agree with RVromer, I had the same breaker blow with 2 heaters till I took them off ofthe inverter now all is fine.

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