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Old 08-08-2013, 03:26 PM   #1
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DC to AC power inverter

Okay I apologize upfront if this is a redundant topic but I have searched and can't see a match thread to my specific issue.

The short of it... I want to be able to run 2 TV's off the DC 12 batteries on my 3150 BHD (only for a few hours). And also on occation be able to accommodate a CPAP all night.

I know that there are inverters out there that would be recommended, but my question is, is it possible to somehow hook up an inverter to the batteries and put the power back through the coach via the 110 AC outlets?

I want to avoid drilling and running wires everywhere if at all possible. The TV's are on opposite ends of the rig. And the one in the back has no existing DC plug.

Suggestions?
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Old 08-08-2013, 03:53 PM   #2
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Yes you can do that, by wiring the inverter into a switch that takes both the shore power and inverter power and chooses between them. HOWEVER, many don't do it this way because it puts ALL the 110 circuits on the inverter and you would have to switch everything else off every time you did this.

It can be done tho.

Lots of options and pros and cons to inverter hook ups. I don't have one yet for the TV but am thinking about it. My current plan is to put 2 specific outlets, one by the TV and one in the kitchen powered by an inverter located right by the battery. Maybe a winter project, if Santa is kind.
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Old 08-08-2013, 03:55 PM   #3
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What is a CPAP?

12v TVs would be more efficient than the inverter route.

The problem with what you want to do it somehow preventing the various other 120v appliances in your RV from using power from the inverter. Things like refrigerator, microwave clock, CONVERTER. If you can address that, you can probably find a transfer switch somewhere to do what you want.
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Old 08-08-2013, 04:06 PM   #4
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Talking

Thanks for the responses so far.

Maybe a stupid question but would an adapter from my shore cord plugged into an inverter at the battery put the 12V to the AC outlets? Or am I dreaming/wishing?

BTW CPAP is a sleep apnea machine for the ol man.
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Old 08-08-2013, 04:09 PM   #5
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Quote:
Originally Posted by garbonz View Post
Yes you can do that, by wiring the inverter into a switch that takes both the shore power and inverter power and chooses between them. HOWEVER, many don't do it this way because it puts ALL the 110 circuits on the inverter and you would have to switch everything else off every time you did this.

It can be done tho.

Lots of options and pros and cons to inverter hook ups. I don't have one yet for the TV but am thinking about it. My current plan is to put 2 specific outlets, one by the TV and one in the kitchen powered by an inverter located right by the battery. Maybe a winter project, if Santa is kind.
The TV's would only run at night for a couple of hours after the 10am all gen's off curfew. So I wouldn't be running anything else other than maybe a few lights in the coach. The CPAP would be an all night thing if possible. I think it only draws like 15 amps total
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Old 08-08-2013, 04:09 PM   #6
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...
Maybe a stupid question but would an adapter from my shore cord plugged into an inverter at the battery put the 12V to the AC outlets? Or am I dreaming/wishing?
Yes, if you can address the other problems I mentioned, that will work.
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Old 08-08-2013, 04:12 PM   #7
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Thanks BarryD0706 I think that would be an inexpensive easy route, I'll give it a shot.
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Old 08-08-2013, 04:13 PM   #8
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15 amps AC is a lot (and a lot more than TVs). That would require a 2kw inverter and would draw 150 amps from your battery. You wouldn't be able to do that overnight without a much bigger battery system.
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Old 08-08-2013, 04:19 PM   #9
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My bad! 30 watts at 120 volts so actually 0.25 amps constant
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Old 08-08-2013, 04:19 PM   #10
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Inverter

Xantrex offers a transfer switch that will do what you want.
They are about 60 bucks.
You should use one of their inverters to make the job easy, but not necessary. I plan on doing just what you are talking about. I plan on installing my inverter/transfer switch next to the breaker panel inside the cabinet. Be sure you have enough air circulation around it. My coach batteries are about 7 feet from the breaker panel. I am going to disconnect the circuit running to the both TV's and connect it to the inverter. This setup is what Forrest River uses for the residential refridge.
If you have any questions feel free to ask.
I am going to do this so my wife can watch a little TV while going down the road and not having to run the generator.
One thing you may want to do is invest in better batteries. Mine came with 2 small 12 volt batteries that don't last but 4 hours running the refridge. Just do your homework on battery size needed.
Good luck
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