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10-02-2012, 11:25 AM
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#15
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Member
Join Date: Aug 2012
Posts: 33
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Why run it off an inverter when the circuit in the blanket turns it back into DC. So you're losing more power going from DC to AC back to DC.
Granted I wouldn't run one over night unless it was on a low setting and I had 3 good sized deep cycle batteries to feed it. I do however, recommend going with a 12 volt heated blanket instead of converting back and forth. It isn't much power lost, but every bit helps, especially when it comes to starting up the TV in the morning.
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Duct tape and superglue.
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10-02-2012, 03:08 PM
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#16
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Senior Member
Join Date: Aug 2012
Posts: 1,325
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If you have a pure sine wave inverter, any electric blanket should work fine.
If you have a modified sine wave (MSW) inverter, newer electric blankets won't work because the controller will burn up. Same thing with "heated throws."
The problem with the 12-volt electric blankets is that they are too small to use as a blanket on a bed. (I have one.) I have heard good reports on 12-volt mattress warmers, but I want a blanket not a mattress warmer, so I didn't investigate further.
We currently have an electric blanket that is at least 15 years old, and it works on the MSW inverter. It seems to have lost some of its oomph over the years of using it on the inverter (we fulltime), but it still works. We turn it on before going to bed, and unless it's going to be below about 55 in the RV overnight (like if we're not running the heater), we don't leave it running all night. And even if it does run all night, if it's on a very low setting, it cycles on and off. I don't know what the battery usage would be--we have six so I've never even thought about it.
I wouldn't even try it with a blanket or throw that's less than 10 years old--probably more. If you have an old one that might be a candidate, take a look at the controller. If it's mechanical, and not electronic, it might work. Like if it has real buttons that get pushed down and stay down for the settings (like three buttons--it it has 10 settings or something, it's probably electronic). Or a real dial that spins and not just something that looks like a dial but you actually press on the round dial-looking thing to set it. Or a switch that looks like an arrow that you point at what setting you want (I had that on a very old heating pad that worked on the MSW inverter for years, but has now spazzed out and works only on the lowest setting.)
Dunner, if your heating pad is as ancient is you say it is, it will probably work. But if it doesn't and you burn it up, do not despair because I found a heating pad that will work on a MSW inverter. It's by SoftHeat and the one I got is 12x24--a perfect size for foot warming. I saw it in a store and thought the controller looked mechanical enough to take a risk, and it works perfectly. It has an auto-off "feature" but other than that, I'm very happy with it. This photo shows a the controller on my heating pad. Note that it's an actual slider; mine has three heat settings where the slider clicks into place. That's going to be the key to getting a controller that works on the MSW inverter.
http://www.kaz.com/images/productsho...961af03c79.jpg
And imorton, I don't know about pulsing being hard on the inverter. We have a big solar array--big enough that we wanted to siphon off extra power when the batteries are full, and hooked up the electric water heater to the inverter. It's kind of complicated, but the water heater pulses on and off several times a second (cued by the voltage of the batteries). We've been doing this for years and the MSW inverter that the RV manufacturer installed is still working fine.
To be honest, I kind of want it to fail because that would spur me to buy a pure sine wave inverter and be done with the hassles. But so far, abuse via microwave, water heater, and electric blankets have failed to kill it.
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10-02-2012, 03:27 PM
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#17
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Senior Member
Monaco Owners Club
Join Date: Mar 2012
Location: Angola State Prison - Murder
Posts: 4,230
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Our 2 Jack Russells both put out 102 degrees continuously. No inverter, just some Alpo once in a while
__________________
John & Clare Lyon
2007 43.5' Monaco Dynasty Palace III (All Electric)
Towd: 2011 Chevy Equinox
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10-02-2012, 05:22 PM
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#18
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Senior Member
Join Date: Jun 2011
Location: FL
Posts: 11,452
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As mentioned, your mileage may vary. Our electric blanket won't run on our inverter. Our lap blankets will but the controls get very hot and we have let the smoke out of two of them. When and if our inverter dies we will replace it with a pure sine wave version.
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Certified Senior Electronic Technician, Telecommunications Engineer, Telecommunications repair Service Center Owner, Original owner HR 2008
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10-02-2012, 05:50 PM
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#19
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Senior Member
Join Date: Jun 2011
Location: Phx, Arid~zona
Posts: 11,106
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Quote:
Originally Posted by oatmeal
Dunner, if your heating pad is as ancient is you say it is, it will probably work. But if it doesn't and you burn it up, do not despair because I found a heating pad that will work on a MSW inverter. It's by SoftHeat and the one I got is 12x24--a perfect size for foot warming. I saw it in a store and thought the controller looked mechanical enough to take a risk, and it works perfectly. It has an auto-off "feature" but other than that, I'm very happy with it. This photo shows a the controller on my heating pad. Note that it's an actual slider; mine has three heat settings where the slider clicks into place. That's going to be the key to getting a controller that works on the MSW inverter.
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It's 11x15", 30 speed, 35 Watt, with 3 Thermostat Safety Controls, which I have no idea what they are. Laying across the bottom of the pad is the moisture resistant cover.
Dated box cover.
An excerpt from the Guarantee.
Old enough? Don't know how long my parents had it, but I can remember it being around forever. Haven't tried in on my MSW inverter, but from what I'm reading, it should work. I haven't looked, but I'm guessing the control is a bi-metal dohicky.
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10-02-2012, 06:37 PM
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#20
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Senior Member
Vintage RV Owners Club Holiday Rambler Owners Club
Join Date: Sep 2012
Posts: 605
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We ruined the controllers on our electric blankets with a Magnum 2000 inverter that used modified sine-wave.
__________________
Steve, Mary & Buddy our 2-year-old Chihuahua mix
1995 36' HR Endeavor, 460 w/Banks, 2005 PT Cruiser
Fulltimers originally from Michigan, hanging out in Oregon for a spell.
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10-03-2012, 06:04 PM
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#21
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Senior Member
Solo Rvers Club iRV2 No Limits Club
Join Date: Feb 2011
Location: Yuma County, AZ
Posts: 10,869
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Dunner,
Casco products still exists in Bridgeport CT. Casco Products Corp - Bridgeport, CT (Connecticut) | (203) 922-3200
They might pay big $ for your working antique if they have a company Museum.
__________________
Barb (RVM18) with Morkies Lily & Bebe RIP Sena FMCA#F466348
"Homer" ‘11 Shasta Cynara, pulling "Ranger" '97 Ford Ranger toad
The Journey is Our Destination. Full-timer May 2011 - July 2021
[SIGPIC][/SIGPIC]
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10-03-2012, 06:28 PM
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#22
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Senior Member
Join Date: Jun 2011
Location: Phx, Arid~zona
Posts: 11,106
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Yeah, but I might end up with one that won't work/like MSW.
I meant to search, but got CRS(even had a hard time remembering CRS).
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10-03-2012, 06:44 PM
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#23
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Senior Member
Join Date: May 2004
Location: Auburn, CA, Havasu, AZ & Mulege, BCS
Posts: 5,385
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We use an electric blanket off a Xantrex RS2000 psw inverter, low setting for sleeping, high for warming the bed. We have 600ah of house batt's, never had a problem.
__________________
Baja-tested '08 2-slide 36'
Alpine: The Ultimate DIY'er Project
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10-04-2012, 07:17 PM
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#24
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Senior Member
Solo Rvers Club iRV2 No Limits Club
Join Date: Feb 2011
Location: Yuma County, AZ
Posts: 10,869
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Ok, so what will MSW kill and what is safe to run? I tried Google, but ended up back where I started. I have a 300 watt plug in MSM inverter.
__________________
Barb (RVM18) with Morkies Lily & Bebe RIP Sena FMCA#F466348
"Homer" ‘11 Shasta Cynara, pulling "Ranger" '97 Ford Ranger toad
The Journey is Our Destination. Full-timer May 2011 - July 2021
[SIGPIC][/SIGPIC]
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10-04-2012, 07:23 PM
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#25
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Senior Member
Join Date: Jun 2011
Location: Phx, Arid~zona
Posts: 11,106
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Don't go anywhere Barb. Gonna go see if my fossil of a heating pad works on my 600 watt MSW inverter.
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10-04-2012, 07:39 PM
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#26
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Senior Member
Monaco Owners Club
Join Date: Aug 2010
Location: Irondale, Alabama
Posts: 470
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Quote:
Originally Posted by okmunky
Ok, so what will MSW kill and what is safe to run? I tried Google, but ended up back where I started. I have a 300 watt plug in MSM inverter.
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Anything with electronics. I have lost two coffee pots. Now the coffee maker only has an on off switch. Also lost an electric alarm clock. My new alarm clock seems to work okay on MSW, but it runs a little fast and I have to set it every once and a while.
Laptops are not effected as the cord charges the battery and does not power it directly. TV's seem to do fine.
__________________
2008 Monaco Camelot 42 DSQ
Irondale, Alabama
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10-04-2012, 07:41 PM
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#27
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Senior Member
Join Date: Jun 2011
Location: Phx, Arid~zona
Posts: 11,106
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My old relic of a heating pad works fine on MSW.
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10-04-2012, 08:17 PM
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#28
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Senior Member
Join Date: Jan 2011
Location: Pensacola, FL
Posts: 2,457
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Jim - If you want to stay with the 120 volt blanket, and it does have an electronic control, you might consider a small PSW inverter. 300 to 600 watts would be more than adequate, and would probably be more efficient than your larger unit - i.e. efficiency as a function of actual amps drawn. (90% efficiency from a 2000 watt inverter would draw 4 times more current than the same % efficiency in a 500 watt unit.) A larger inverter running at a small percent of maximum rating is also usually less efficient than a smaller unit running at a larger percent of it's maximum.
Amazon lists a well-reviewed 600 watt "Power Bright" PSW unit for $163. From the reviews, it looks like the smaller units do not hold up well. Lots of stories of releasing the factory-installed magic smoke.
Might be worth a "buy-and-try" test. I'd love to see the actual amp. numbers from both the small and large inverter.
__________________
2008 Itasca 37H
2011 & 2012 Len & Pat's "One lap of America"
27K miles & 41 states in 13 months
Yellowstone Lake 6-1-2012
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