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Old 03-03-2016, 11:50 AM   #1
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2015 25' FB Flying Cloud
Sandy , Utah
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Powering small AC device from DC sourch

Hello Everyone,

I have a 2015 25FB that has no DC Power Port anywhere (Dumb!). I have a small AC device (CPAP) that has very little current draw. Using the built in 1000W converter seems like it would drain the batteries in no time while boondocking. I have a small converter designed to plug into a standard DC Power Port that is for charging small AC devices. It would use significantly less battery power to run. Has anyone found a spot with access to DC that I could install a DC Power Port in the bedroom? Thank you all in advance!
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Old 03-03-2016, 01:05 PM   #2
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Have you tried dropping one of the speakers to see if you can access the 12 V wiring to the LED lights? In my classic I was able to access the 12 V wiring and install additional USB sockets, but you could as easily install a cigarette lighter receptacle.
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Old 03-03-2016, 03:32 PM   #3
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You might be worse off using a smaller and less efficient inverter than using the larger built in one that came in your trailer.
Or it could be just as bad. Inverter efficiency varies from 50% to 92% - hard to tell which would be more efficient without testing.
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Old 03-03-2016, 05:44 PM   #4
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Thanks for the tip! I hadn't thought of the LED lights. There is one directly above my corner of the bed on the bottom of the overhead storage.
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Old 03-04-2016, 12:07 PM   #5
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12 V in the bedroom

For whatever it's worth, I had a 2010 25' FB Flying Cloud in which I needed to install a CPAP. I found 12V on a panel in storage just beneath the head of the bed, also accessible from the outside storage door.
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Old 03-04-2016, 12:16 PM   #6
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I have added a 12v DC outlet by tapping into the wires for the reading lights. BTW, you can get a DC plug for your CPAP device, which will eliminate the need for any conversions and use less power. (Respironics Shielded DC Cord for System One 60 Series CPAP BIPAP AUTO Car Truck Auto RV). I use this for my CPAP.
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Old 03-04-2016, 12:53 PM   #7
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Vero Beach , Florida
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Our 2014 Eddie Bauer is (like all EBs) a front bedroom. The converter and 120v panel are both under the bed. I had an open 12v fuse slot in my converter, so I ran a 3' length of 10 ga wire and cut a hole through the bed stand to add an additional 12 volt receptical 6" above the floor near the head of the bed on the side facing the bathroom (rear) of the trailer. I chose a receptical that had one old style cigarette lighter outlet and two USB ports. Since that is the boss's side of the bed it is most often used to charge her i-products (-phone and -pad) and to run her desktop model Fantastic Fan. A 10amp blade fuse protects that circuit.

Assuming your converter is in the same spot, you could do the same, or (for a modest installation fee) have an RV shop do it for you. It really isn't much work and could be added to an existing circuit if you don't have an open slot.

I have not measured the draw, but I think it would be way less demanding on your batteries than having the inverter running all night.
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Old 03-04-2016, 01:11 PM   #8
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Two things,
1, you might want to check the amperage draw on the cpap machine to ensure your inverter adaptor is sufficient. The other poster about the 12v wiring might be the best way.
2, the wiring on the lamp circuit with 10amp fuse might not be sufficient for cpap and or inverter. Wire to small, fuse light.
3, If your 25FB is like my 27FB, then all the electric stuff is in the area at the front of the trailer and hatch. Do a custom 12v receptacle wired direct to the battery leads, with proper wire gauge and fuse size to pose the cpap.
Lastly, draw matters so all this trouble might still discharge your batteries overnight. Good luck
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Old 03-04-2016, 02:50 PM   #9
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The feed wires that Airstream uses for all of their lighting is a minimum 12AWG. One can easily remove a light fixture from a spot light and tap into these wires, as they are hot all the time since they each have an independent switch. You will find plenty of room in the false wire way that is between the bottom of these cabinets and the interior floor of same.

I would use 12AWG for any 12VDC connection and be sure that your DC socket is also rated for 20 amps (the capacity of the 12AWG wire). Even though these lighting wires are fused at the DC fuse block, I would include an additional 15 amp fuse for any DC outlet circuit that you add. Airstream has, over the last few years, de-rated their fuses to 15 amps from 20 amps in their fuse block, even though they still use 12AWG wire. This is probably due to the voltage drop potential of their long wire runs.

Remember, you are fusing to protect the wire, not the device……….
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Old 03-04-2016, 04:26 PM   #10
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Quote:
Originally Posted by rocco52 View Post
Hello Everyone,

I have a 2015 25FB that has no DC Power Port anywhere (Dumb!). I have a small AC device (CPAP) that has very little current draw. Using the built in 1000W converter seems like it would drain the batteries in no time while boondocking. I have a small converter designed to plug into a standard DC Power Port that is for charging small AC devices. It would use significantly less battery power to run. Has anyone found a spot with access to DC that I could install a DC Power Port in the bedroom? Thank you all in advance!
Be sure you understand the draw of the CPAP. Some of them have heaters and use quite a bit of power. Running one of those off batteries could be difficult.

Well made modern inverters have very little idle current draw and so there might not be as much benefit as you think to switching to a smaller one.
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Old 03-04-2016, 08:34 PM   #11
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Ed, I have a 2014 25' FC.
Next to the Blue Ray, I have a cigarette lighter fixture where I plug in the 12V extension cord from West Marine. Do you have a 12V receptacle next to your Blue Ray??
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Old 03-04-2016, 08:38 PM   #12
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Cohasset , Massachusetts
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Quote:
Originally Posted by rocco52 View Post
Hello Everyone,

I have a 2015 25FB that has no DC Power Port anywhere (Dumb!). I have a small AC device (CPAP) that has very little current draw. Using the built in 1000W converter seems like it would drain the batteries in no time while boondocking. I have a small converter designed to plug into a standard DC Power Port that is for charging small AC devices. It would use significantly less battery power to run. Has anyone found a sporum postot with access to DC that I could install a DC Power Port in the bedroom? Thank you all in advance!
Ed,
look at my message at the end of this forum
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Old 03-05-2016, 12:43 AM   #13
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You can use your CPAP without heater and moisture. You will get use to it and the current draw is about 3 amps @ 12 volts DC. I have done it for years. I learned to do it years ago flying high altitude on constant oxygen where moisture would freeze if present. The moisture and heater are comfort items, but do not improve the CPAP
performance.
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Old 03-05-2016, 10:34 AM   #14
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You guys have been a great help! I had not thought of making a connecion under the mattress where all of the electronics are. That would be fairly simple. I read the manual on my new ResMed CPAP and heating and humidifying can both be turned off. Thank you all very much!

Ed
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