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Old 05-10-2017, 07:59 AM   #1
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Heated Mattress Pad Safety

Hi Folks --

This might not be the right place for my question, but who would know the answer better than the people who gravitate to this forum?

I just bought a Sunbeam heated mattress pad for my 2015 22FB Sport, and I see in the user manual the following: "Do not use with generators, power converters or inverters." Why would it be unsafe to use with the inverter when off shore power? How is that different from plugging in directly to an AC source?

Of course, this is one of over 20 warnings in the first two pages of the manual. Is it just something the lawyers (who DON'T understand all things electrical) insisted on?

I've read all the threads I could find regarding heated mattress pads and found nothing on this topic. Hence my tug at your shirtsleeves for guidance.

Thanks in advance!

Kelly
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Old 05-10-2017, 08:12 AM   #2
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I can't think of a safety reason, other than Sunbeam would have less comfort with consistent, stable voltage outputs from a wide variety of products than they would with federally regulated grid power supplies.
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Old 05-10-2017, 08:27 AM   #3
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The blanket, being solid state controlled won't work with generator because the power output can be "dirty". This is why PC's and other sensitive electronics prefer full wine wave, clean power which usually you get from the power grid.

We put reflectix between the base and mattress.. all the best we need once warmed up.
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Old 05-10-2017, 08:29 AM   #4
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Originally Posted by cwf View Post
The blanket, being solid state controlled won't work with generator because the power output can be "dirty". This is why PC's and other sensitive electronics prefer full wine wave, clean power which usually you get from the power grid.

We put reflectix between the base and mattress.. all the best we need once warmed up.
Possibly, but I don't think this is true with a pure sine wave inverter generator.
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Old 05-10-2017, 09:03 AM   #5
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I assume this has a safety certification, and it is probably a requirement for that certification.
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Old 05-10-2017, 09:27 AM   #6
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I assume this has a safety certification, and it is probably a requirement for that certification.
That was my guess, too, but I'd like to be sure!

I would be running the pad on a low setting off the batteries, so my question is mainly about the fact that an inverter would be between the power source and the device. Is there any risk at all of excessive power reaching the heating element and causing a fire hazard? Is it possible the device's thermostat would be damaged by a less precise and consistent power supply than would be provided plugging into shore power? And when the batteries are fully- or nearly fully-charged, is their output (via the inverter) significantly poorer quality than shore power?

Thanks, everyone, for your advice!

Kelly
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Old 05-10-2017, 09:42 AM   #7
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Admittedly, I don't know very much about the electronic technology involved with using a heated mattress pad in an Airstream or any RV. What I can comment on is long term use of a heated mattress pad in an RV.

We have had three Airstreams over the last twelve years. Two had queen beds and our current Airstream has twin beds. We have had Sunbeam heated mattress pads in each of our Airstreams, and have used them extensively both on shore power and generator power.

Brian
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Old 05-10-2017, 10:03 AM   #8
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The newer AS use memory foam in the mattress top. Heated pads are not recommended because of the heat sensitive nature of the foam. https://tempurpedic.ca/product-info/product-care
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Old 05-10-2017, 12:49 PM   #9
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Quote:
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Possibly, but I don't think this is true with a pure sine wave inverter generator.

Agreed! If the inverter style generator you should be ok!!!
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Old 05-10-2017, 01:01 PM   #10
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If you're running it "off the batteries" via your inverter, I'm quite certain that your battery(ies) will be very dead long before the morning. How many watts is this heating pad as it could potentially draw more watts than your inverter is rated for!?!
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Old 05-10-2017, 01:15 PM   #11
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If you're running it "off the batteries" via your inverter, I'm quite certain that your battery(ies) will be very dead long before the morning. How many watts is this heating pad as it could potentially draw more watts than your inverter is rated for!?!
Inverter is likely 1000 watts, but even if only 500 watts will be no problem. Heated blankets/pads draw as little as 100 watts. Times two sides for a larger one that's 200 watts. And many people keep them set at level 5 out of 10. That's 100 watts total which is .83 amps. 10 hours would draw as little as 8 amps, or as many as 16 if it's pulling 200 watts. Two fully charged, healthy Interstate 24 Batteries provide 84 amps before depleting to 50%. Plenty of power for an electric blanky off the inverter for the night.
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Old 05-10-2017, 01:53 PM   #12
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Electric Blanket here.

It is a Sealy (queen) and has two controls. Each is rated at 180 watts.

We have tried using it on generator but get no heat output. Maybe due to lack of ground? Or that it is digital? The controls do light up but that is all.

Dwight
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Old 05-10-2017, 02:15 PM   #13
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I have used a DC 12 volt heated mattress pad for years--No Problems
Just watch your battery charge level.
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Old 05-10-2017, 11:28 PM   #14
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Electric Blanket here.

It is a Sealy (queen) and has two controls. Each is rated at 180 watts.

We have tried using it on generator but get no heat output. Maybe due to lack of ground? Or that it is digital? The controls do light up but that is all.

Dwight
Dwight.. does the heater work when plugged in your home electricity? Just a quick check...
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