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Old 01-14-2021, 01:54 AM   #1
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Brand: Thor Motor Coach
Model: ACE 30.3
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THOR #1291
No 12V at inverter

2018 thor ace 30.3

Inverter panel dead, no 12 volt on terminals at inverter
Fuses in box all good, no visible inline fuse under bed (loc of inverter) breaker in battery compartment all checked.
No other issues.(battery is charging and holding charge)

Is there another inline fuse hidden somewhere ? I am gonna run a cable from battery to inverter in to make sure inverter is working.

Any other suggestions ?

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Old 01-14-2021, 03:03 AM   #2
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THOR #19133
There will be one fuse or DC circuit breaker between the battery and the inverter. A meter is your friend. Check the battery first, then the input side of the fuse/circuit breaker, then the output side, then you will have found your issue, I'm guessing
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Old 01-14-2021, 03:45 AM   #3
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THOR #7035
Quote:
Originally Posted by RipVanWinkle View Post
2018 thor ace 30.3

Inverter panel dead, no 12 volt on terminals at inverter
Fuses in box all good, no visible inline fuse under bed (loc of inverter) breaker in battery compartment all checked.
No other issues.(battery is charging and holding charge)

Is there another inline fuse hidden somewhere ? I am gonna run a cable from battery to inverter in to make sure inverter is working.

Any other suggestions ?
Put a voltmeter on the inverter DC terminals. No need to run a wire.
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Old 01-14-2021, 10:19 AM   #4
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THOR #16471
I agree that you should only use a voltmeter. By using a wire, if the inverter is at fault you could set yourself up for some early July 4th fireworks!
If the coach battery is good and nothing at the terminals, do not blame the inverter... yet, there is something open betwixt the two.
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Old 01-14-2021, 11:54 AM   #5
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THOR #1291
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Originally Posted by 16ACE27 View Post
Put a voltmeter on the inverter DC terminals. No need to run a wire.
What i wrote “ , no 12 volt on terminals at inverter”
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Old 01-14-2021, 11:55 AM   #6
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THOR #1291
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Originally Posted by OldWEB View Post
I agree that you should only use a voltmeter. By using a wire, if the inverter is at fault you could set yourself up for some early July 4th fireworks!
If the coach battery is good and nothing at the terminals, do not blame the inverter... yet, there is something open betwixt the two.
How could the inverter be at fault if there are no standing 12 volt at the input ?
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Old 01-14-2021, 11:58 AM   #7
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Originally Posted by OldWEB View Post
I agree that you should only use a voltmeter. By using a wire, if the inverter is at fault you could set yourself up for some early July 4th fireworks!
If the coach battery is good and nothing at the terminals, do not blame the inverter... yet, there is something open betwixt the two.
The coacher battery is good, just no 12volt at the inverter terminal.l so i am suspecting some inline fuse
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Old 01-14-2021, 12:49 PM   #8
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OK, you have the answers... do not need ME then. Good luck.
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Old 01-14-2021, 02:28 PM   #9
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THOR #7035
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Originally Posted by RipVanWinkle View Post
What i wrote “ , no 12 volt on terminals at inverter”
As measured by a voltmeter? Or by the Inverter display? I assumed the latter when I wrote my response. I am assuming the former with your response here.

Was this a factory installed inverter or after market install?

In any case, there SHOULD be either a DC breaker, an inline BIG fuse, or a fusible link at the battery end of the positive cable going to the inverter.

All bets are off if it was an after market install; in that case it may not even be wired directly to the battery bank.
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Old 01-14-2021, 03:06 PM   #10
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Quote:
Originally Posted by RipVanWinkle View Post
2018 thor ace 30.3

Inverter panel dead, no 12 volt on terminals at inverter
Fuses in box all good, no visible inline fuse under bed (loc of inverter) breaker in battery compartment all checked.
No other issues.(battery is charging and holding charge)

Is there another inline fuse hidden somewhere ? I am gonna run a cable from battery to inverter in to make sure inverter is working.

Any other suggestions ?
There are two circuit breakers in the front wall of the battery compartment. The front one (100 amp) is for the jacks and generator start. The rear one is for the inverter, 200 amp for an 1800 watt inverter or 100 amps fro a 1000 watt inverter. Trip and reset the circuit breaker.
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Old 01-14-2021, 03:32 PM   #11
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THOR #1291
Quote:
Originally Posted by 16ACE27 View Post
As measured by a voltmeter? Or by the Inverter display? I assumed the latter when I wrote my response. I am assuming the former with your response here.

Was this a factory installed inverter or after market install?

In any case, there SHOULD be either a DC breaker, an inline BIG fuse, or a fusible link at the battery end of the positive cable going to the inverter.

All bets are off if it was an after market install; in that case it may not even be wired directly to the battery bank.
As measured with a voltmeter at the terminals of the inverter(located under bed) ...no display existinf on inverter xm1000 and remote display xm1800 has nothing ( which makes sense as its getting power from inverter)

Its the factory installed one...just noticed it not working when doing my monthly maint and tests..

I agree there should be a a big inline fuse but the ones in the battery compartment are fine... under the bed , the lines go from inverter terminals into a poorly foamed out hole under the coach
I wonder if the line going to from battery to inverter is dedicated (cause everything else 12 V works) ...


I am gonna climb under the burr infested rv and see if i can trace the line and maybe get a diagram from thor.

I am also debating if i just run a new line with new inline fuse....but i guess i have to get that info from thor unless someone had a similar issue.
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Old 01-14-2021, 03:42 PM   #12
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THOR #1291
Quote:
Originally Posted by Beau388 View Post
There are two circuit breakers in the front wall of the battery compartment. The front one (100 amp) is for the jacks and generator start. The rear one is for the inverter, 200 amp for an 1800 watt inverter or 100 amps fro a 1000 watt inverter. Trip and reset the circuit breaker.
Thanks i will try that again....I think its time to peel the protective paint off them and make sure they actually work.. they triggered and reset correctly
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Old 01-16-2021, 03:38 PM   #13
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THOR #1291
Quote:
Originally Posted by Beau388 View Post
There are two circuit breakers in the front wall of the battery compartment. The front one (100 amp) is for the jacks and generator start. The rear one is for the inverter, 200 amp for an 1800 watt inverter or 100 amps fro a 1000 watt inverter. Trip and reset the circuit breaker.
Thanks again for the info.

all of them triggered and reset fine but this beauty here does not have a "trigger" button

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Old 01-16-2021, 03:47 PM   #14
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Originally Posted by RipVanWinkle View Post
Thanks again for the info.

all of them triggered and reset fine but this beauty here does not have a "trigger" button

That one likely goes to the DC buss through the battery disconnecy latching relay.
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