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Old 02-02-2019, 06:06 AM   #1
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Inverter Help-OVERTEMP

My 2008 Dynasty’s inverter regularly shuts down while dry camping, with genset running. The Remote Panel red fault light comes on and the panel says OVER TEMPERATURE. The shut down can last a few seconds or up to a couple minutes. If I lower Charge Rate to 60%, this seems to stop it. However it also seems to take an extraordinary long time to charge my four new Costco six volt GC flooded batteries. Last night genset ran for four hours, yet batteries were still in bulk charging.

Does anyone have any suggestions for fixing this?
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Old 02-02-2019, 06:33 AM   #2
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What make/model Inverter do you have.

My Xantrex says the overheat warning comes on when the FET and transformer reaches 194 degrees F.

I would check that there is sufficient air flow around the unit.

Possibly the battery-voltage sense (or battery temperature) circuit is bad (bad connection, etc.) and the Inverter is just continuously charging resulting in it getting too hot.

Put a voltmeter on the batteries with Inverter off and confirm if they are are charged or not. If they are fully charged and then the Inverter is still trying to charge them, then you have a problem in the sense circuit.
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Old 02-02-2019, 02:26 PM   #3
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It is the Magnum 2812 model. Batteries are not overheating and are charging. If my charge rate at the remote is set at 80% or above, inverter shuts down within minutes of the genset starting. It comes back on, but will shut down again in a few minutes.

I do have a heat sensor on the batteries. I suppose it could be defective, but this would not explain why the inverter doesn’t shut down when set at 70% charge rate or lower. When I replaced the batteries, I found the sensor was merely taped to the side of one of the batteries. I don’t know if this is proper or not.
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Old 02-02-2019, 02:37 PM   #4
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Quote:
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I do have a heat sensor on the batteries. I suppose it could be defective, but this would not explain why the inverter doesn’t shut down when set at 70% charge rate or lower. When I replaced the batteries, I found the sensor was merely taped to the side of one of the batteries. I don’t know if this is proper or not.
I also have a Magnum MS2812. The heat sensor was an optional item and I didn't install one. I'd disconnect yours to see if that changes anything.
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Old 02-02-2019, 02:40 PM   #5
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Is the vent motor running inside the compartment where it lives? Have you blown the dust out of it?

If you can leave the compartment door open while testing give that a shot. Of course if you are in the freezing temps this does not apply.
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Old 02-02-2019, 03:14 PM   #6
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I also have a Magnum MS2812. The heat sensor was an optional item and I didn't install one. I'd disconnect yours to see if that changes anything.
Good idea. I will do just that. Thanks.
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Old 02-02-2019, 03:20 PM   #7
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Is the vent motor running inside the compartment where it lives? Have you blown the dust out of it?

If you can leave the compartment door open while testing give that a shot. Of course if you are in the freezing temps this does not apply.
I have left the bay door open but nothing changed. I can hear the inverter operating. I am in Phoenix.

I will check for dust. Thanks.
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Old 02-02-2019, 03:20 PM   #8
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The battery temp sensor is more for float charging voltage.

In colder weather, the float voltage will increase, and drop when hot.

As mentioned, check the cooling fan and air flow.
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Old 02-02-2019, 05:41 PM   #9
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Okay here’s the latest. We got back to the coach and I opened both bay doors where inverter is housed. Removed a couple things so that there was a foot of open air space throughout the bay. Checked inverter for dust and it is clean. Started genset and increased charge rate to 100%. Temperature here is about 70, but with a nice breeze. No shut down occurred and batteries went to float stage very quickly.

New Problem...upon checking the batteries and tightening the terminals, I found the main negative terminal very loose. I must have overtightened it as it is cracked. I suppose this may effect charging. Going back to Costco to see if they will replace.
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Old 02-02-2019, 08:04 PM   #10
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Ok, probably wasn't clear about a fan running. There is probably a vent with a hidden fan for the compartment and is controlled by a snap thermistor. This keeps the air in the compartment flowing.

As for the dust, a simple visual is not adequate. Use your air hose to gently dislodge buried dust.

And do be sure there is plenty of air circulation.

A bad battery post will not cause a problem. This would cause less of a load on th charger.
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Old 02-03-2019, 01:33 AM   #11
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Agree with others there us likely a lack of cooling issue. Instruction, dust buildup, slow or inop fan, etc.

Setting the charge rate down reduces the internal heat needing to be disipated. .
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Old 02-03-2019, 04:41 AM   #12
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Two fans inside remove the cover and make sure they are running. Repair shop in Tennessee will charge around $170.00 to repair it forgot the name but you can google it
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Old 02-03-2019, 06:01 AM   #13
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I can hear the inverter operating.
Internal cooling 0 to 120 cfm variable speed drive using dual 92 mm brushless DC fan

Can you state whether you hear the fan? It makes lots of blower noise when hot. The inverter makes other noises also.
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Old 02-03-2019, 06:36 AM   #14
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This morning started genset 90 minutes ago. Had change rate set at 80%. After about an hour, went outside to check inverter. Touched the housing and it was warm but not hot. I looked inside the housing and could see the fan. It wasn’t moving. Shouldn’t it be operating to cool the inverter?

Checked temperatures at remote. It stated TRANS 114C and FETS 86C. That seemed very high to me, though as stated the housing was only warm to the touch.

I lowered charge rate to 50% which bought temps down to 98C and 80C respectively, after about 15 minutes.

Thanks to all who responded. I plan to call Magnum tomorrow.
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