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Old 09-04-2020, 02:04 PM   #1
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Brand: Thor Motor Coach
State: Georgia
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THOR #20379
Inverter not charging on shore power

Hello all thanks in advance for your assistance. I have looked over the forum and can't seem to locate a solution. I have a 2016 Thor Windsport 34j. The inverter will not charge the house batteries while connected to shore power or the generator. It will however charge while the engine is running. The use store switch is in use. I had the batteries replaced because the old ones had lost a cell and since they will not charge. I have checked all of the circuit breakers and fuses all of them are good. Any possible assistance would be greatly appreciated.

Thanks again.
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Old 09-04-2020, 03:27 PM   #2
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THOR #7035
Do you have an Inverter/Charger or a Converter?
A converter converters 120 VAC to 12 VDC to supply the DC buss and charge the house batteries. An Inverter takes 12 VDC and creates 120 VAC to supply some limited AC loads from the house batteries: some inverters are 2 way devices that also include a charger to charge the house batteries.

In any case you have to verify the "charger" is connected to 120 VAC (Breaker) and supplying 13.5 to 14.5 VDC to charge the batteries.

Besides the USE/STORE switch in USE, there is also a 50 amp DC breaker near the batteries that may be tripped (Red or Yellow flag visible). Pus the flag back in to reset that breaker.
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Old 09-04-2020, 03:35 PM   #3
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Originally Posted by 16ACE27 View Post
Do you have an Inverter/Charger or a Converter?
A converter converters 120 VAC to 12 VDC to supply the DC buss and charge the house batteries. An Inverter takes 12 VDC and creates 120 VAC to supply some limited AC loads from the house batteries: some inverters are 2 way devices that also include a charger to charge the house batteries.

In any case you have to verify the "charger" is connected to 120 VAC (Breaker) and supplying 13.5 to 14.5 VDC to charge the batteries.

Besides the USE/STORE switch in USE, there is also a 50 amp DC breaker near the batteries that may be tripped (Red or Yellow flag visible). Pus the flag back in to reset that breaker.
Well I'm assuming that it is both given it use to charge the batteries. Checked the 50 and its is not tripped. Here are pics of my inverter converter.
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Old 09-04-2020, 03:58 PM   #4
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Well looks like the book and the inverter aren't the same. Doesn't look like the xm1800 is a charger.
Guess that means that something is just killing the batteries.
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Old 09-04-2020, 04:12 PM   #5
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If it's not a inverter/charger, that means you have a converter somewhere hiding.
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Old 09-04-2020, 05:24 PM   #6
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Well looks like the book and the inverter aren't the same. Doesn't look like the xm1800 is a charger.
Guess that means that something is just killing the batteries.
XM1800? Your picture shows an XM1000 which certainly does not charge batteries, it's solely an inverter.

So you have a converter in your Power Panel.

Yeah, DC loads are killing your batteries - you still need to figure out why your converter is not charging the batteries.

Did you located the 50 Amp DC breaker?
Check your reverse polarity fuses on the DC fuse panel.
Do you know how to use a multimeter?
Is your USE/STORE latching relay really closed?
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Old 09-04-2020, 06:15 PM   #7
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Your inverter draws 12 volt power from the batteries to produce 120 volt for the fridge and the TV. That is all it does. You have a converter that converts 120 volt AC from the power center (under the bed) and converts to 12 volts DC to be used to charge the batteries and power all other 12 volt items in the coach. The converter is located in the lower half of the power center in the bed's side wall behind a brown steel panel with a twist lock. It has its own 120 volt AC 15 amp circuit breaker in the power center. The Use/store switch must be on for the batteries to charge by shore power or Generator power. The voltage display on the inverter's panel show the battery voltage. (when on). It will be above 12.8 volts if the batteries are being charged and approximately 13.4 when the batteries are fully charged (floating charge).
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Old 09-04-2020, 08:50 PM   #8
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Well I'm assuming that it is both given it use to charge the batteries. Checked the 50 and its is not tripped. Here are pics of my inverter converter.
Your assumptions are wrong. The XM1000 is not an Inverter/Charger. It is an inverter only.

You need to troubleshoot the converter and based on the thread and your incorrect assumptions I will suggest that you have a dealer or independent RV Technician do the troubleshooting. Do something wrong and you could fry yourself and/or the RV's electrical system.
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