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09-09-2009, 04:56 PM
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#1
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Senior Member
Join Date: Aug 2006
Posts: 343
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Did my Inverter Fry the Electric Blanket??
We have a Dimensions 2000 watt modified sine inverter that has worked great for the last 18 months. Last week, we bought an electric blanket and enjoyed it as the temps started to drop into the low 50's up here in South Dakota (time to head south!). However, when I disconnected the shore power and the inverter took over, both blanket electronic controllers began to smoke and give off that great burning insulation smell ! The blanket was off at the time, but obviously still plugged in.
I wondered if somehow the modified sine power provided by the inverter fried the controllers -- anyone have any insight ?
Thanks - Rick
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Rick
2020 Fleetwood Discovery 40M
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09-09-2009, 06:09 PM
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#2
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Moderator Emeritus
Join Date: Jan 2000
Location: West Palm Beach, FL. USA
Posts: 27,713
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Yeap. Electric blankets are notoriously intolerant of modified sine wave power. If you had a pure sine inverter you would have been ok.
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Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL
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09-10-2009, 02:31 AM
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#3
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Senior Member
Winnebago Owners Club Workhorse Chassis Owner
Join Date: Sep 2007
Posts: 2,976
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Quote:
Originally Posted by rv rick
We have a Dimensions 2000 watt modified sine inverter that has worked great for the last 18 months. Last week, we bought an electric blanket and enjoyed it as the temps started to drop into the low 50's up here in South Dakota (time to head south!). However, when I disconnected the shore power and the inverter took over, both blanket electronic controllers began to smoke and give off that great burning insulation smell ! The blanket was off at the time, but obviously still plugged in.
I wondered if somehow the modified sine power provided by the inverter fried the controllers -- anyone have any insight ?
Thanks - Rick
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i have been using a 12v queen dual control mattress pad with good results for over 2 years.
i got it from backwoods solar for about $100.
__________________
01 WINNEBAGO 35U W20.8.1L 5sp allison SW Wa,. Good Sam, SKP. RVM 198 AMSOIL fluids. BANKS ecm program. SCAN GAUGE II w/ Ally temp. 2 LIFELINE GPL-6CT AGM Batts on their sides. Michelins, TST tptts. K&N panel air filter. AERO mufflers. TAYLOR plug wires. ULTRA POWER track bar. KONI fsd shocks, toad '21MB GLA FWD on dolly
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09-15-2009, 10:13 PM
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#4
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"Formerly Diplomat Don"
Newmar Owners Club
Join Date: Apr 2005
Location: Moorpark, Ca.
Posts: 24,125
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rv rick....There are several electric/electronic items that don't like modified sine waves. Some don't work correctly and others apparently burn up. Someone should probably start a list that we could all add to.
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Don & Mary
2019 Newmar Dutch Star 4018 (Freightliner)
2019 Ford Raptor
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10-04-2009, 08:22 AM
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#5
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Member
Winnebago Owners Club
Join Date: Jul 2007
Location: Burlington Ontario
Posts: 64
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Quote:
Originally Posted by RV Roamer [Gary]
Yeap. Electric blankets are notoriously intolerant of modified sine wave power. If you had a pure sine inverter you would have been ok.
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Hi Gary
How can we tell if we have a pure sine inverter.
Thanks
Gene
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2003 Ultimate Freedom
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10-04-2009, 09:21 AM
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#6
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Administrator in Memoriam
Newmar Owners Club Retired Fire Service RVer's Spartan Chassis
Join Date: May 2000
Location: Newark, DE
Posts: 25,898
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Quote:
Originally Posted by EJVO
Hi Gary
How can we tell if we have a pure sine inverter.
Thanks
Gene
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By the make and model and it may be marked on the inverter.
__________________
Adios, Dirk - '84 Real Lite Truck Camper, '86 Wilderness Cimarron TT, previously 4 years as a fulltimer in a '07 DSDP
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10-04-2009, 09:31 AM
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#7
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Senior Member
Damon Owners Club Workhorse Chassis Owner
Join Date: Mar 2009
Posts: 24,024
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To answer the subject question: Can't tell.. Depends in part on how quickly you pulled the plug
And as others said. ELectric blankets do not always play nice on MSW inverters... Though this is the first smoker I have heard of (Just flat refusal to operate is more common) What's worse is there is absolutely no reason to make them like that.. I mean I recall electric blankets and controllers from the 60's and those would play nice with TSW, MSW, Shore power or even DC if you fed them 120 volts. That's all they cared about 120 volts.
There are several other things that do not always work well, or at all, on MSW.. (Depends on makes and models both of the device in question and the inverter, Sometimes they work well, sometimes not,, but smokers are very rare)
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Home is where I park it!
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10-04-2009, 09:42 AM
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#8
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Registered User
Join Date: Aug 2009
Posts: 256
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Quote:
Originally Posted by EJVO
Hi Gary
How can we tell if we have a pure sine inverter.
Thanks
Gene
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Generally, they are white in color. Both Xantrex and Magnum use white with the Pure Sine wave. Magnum, which is what you probably have, uses Grey for the Modified. Magnum Energy is Modified, MagnaSine is pure.
Look here, and come on down to the Monaco Owners Group more often
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10-04-2009, 11:50 AM
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#9
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Senior Member
Workhorse Chassis Owner
Join Date: Mar 2007
Location: Pikeville, NC
Posts: 1,775
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I destroyed a small refridge/freezer in one of my bays with a M.S.W. inverter. It also destroyed the inverter .
Only pure sine wave inverters for me from now on--- They work great for any appliance .
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Max H,
2002 Newmar Mountain Aire, 37', 3778, W-22, 8.1 Vortac, Ultra Power upgrade, CAI (cold air intake), Taylor wires, colder plugs, Koni shocks.
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10-04-2009, 05:24 PM
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#10
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Senior Member
Damon Owners Club Workhorse Chassis Owner
Join Date: Mar 2009
Posts: 24,024
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Quote:
Originally Posted by EJVO
Hi Gary
How can we tell if we have a pure sine inverter.
Thanks
Gene
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Iwill give you a very easy way to tell if you have an MSW or TSW...
Take a portable radio.. Tune to any station in the AM band.. Turn the inverter on.. If you are still listening to the station. it's TSW. If there is serious, heavy duty, interference, it's MSW. That simple.
The proper way method 1:
Find the make and model and google it, find the spec sheat and read it.
Method 2: Oscilloscope Feed it to a 'scope and read the screen.. this.. of course. requries that you have a scope (I do) and know how to read it (Likewise)
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Home is where I park it!
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10-09-2009, 07:51 AM
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#11
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Senior Member
Winnebago Owners Club
Join Date: May 2000
Location: Sioux Falls SD USA
Posts: 415
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From a search on this subject....
We replaced our electric blanket this year and noticed that it does not operate on inverted battery power. (the old one did). Just get an error state on the display(flashing 88). Instructions say to unplug, wait, and replug. Same result.
The new one has a digital controller. Works fine on shore power and genset.
Anyone know why and how the blanket knows the difference? There must be some difference between plug and inverted power.
Anything we can do?
We are greatfull for the knowledge of those on IRV2 and thank you for your input.
__________________
Steve & Sherri
2002 Winnebago Journey DL 39QD
Newmar Owners Club
Join Date: May 2000
Posts: 6,389
Your inverter is most likely a modified sine wave inverter, and some appliances, like your digital blanket controller, just don't work or don't work well on a modified sine wave.
Your generator produces a pure sine wave, like shore power.
2 choices.
Get a new blanket like your old one. $$$
Get a pure sine wave inverter. $$$$$$$$$$$
Unfortunately, there is no other solution.
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Adios, Dirk
'07 Dutch Star 4029, '08 Yukon XL, Escapees, NKK, FMCA, Telephone Pioneers, ATA
My Location, My Rig
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Steve & Sherri
2002 Winnebago Journey DL 39QD
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10-09-2009, 10:23 AM
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#12
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Senior Member
Damon Owners Club Workhorse Chassis Owner
Join Date: Mar 2009
Posts: 24,024
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Quote:
Originally Posted by Zimectrin
Your generator produces a pure sine wave, like shore power.
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If you are otherwise happy with you inverter I'd go for a non-digital controlled (old fashion) electric blanket.. One that could care less if the wave form is less than perfect
Now, as to the quoted text... I have seen shore power traces, and generator power traces.
A good generator is better than shore power
A contractor's model...... Often much worse
My Onan does very well.. (Not quite as good as my Prosine 2.0 but real close) An Genrac 1000 I had was fairly clean.. A Pep-boys specil was... Not so good.
Just so you know
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Home is where I park it!
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10-31-2009, 03:43 PM
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#13
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Junior Member
Join Date: Oct 2009
Posts: 1
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Electric Blankets
Where can a person find and purchase the "old" style blankets?
All the info so far has been very helpful! Thanks!
Sue
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10-31-2009, 05:48 PM
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#14
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Senior Member
Winnebago Owners Club Workhorse Chassis Owner
Join Date: Sep 2007
Posts: 2,976
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Quote:
Originally Posted by Sireland
Where can a person find and purchase the "old" style blankets?
All the info so far has been very helpful! Thanks!
Sue
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we have been happy with our 12v queen size dual control mattress pad heater from backwoods solar online. we have had no problems in 2 1/2 years.
__________________
01 WINNEBAGO 35U W20.8.1L 5sp allison SW Wa,. Good Sam, SKP. RVM 198 AMSOIL fluids. BANKS ecm program. SCAN GAUGE II w/ Ally temp. 2 LIFELINE GPL-6CT AGM Batts on their sides. Michelins, TST tptts. K&N panel air filter. AERO mufflers. TAYLOR plug wires. ULTRA POWER track bar. KONI fsd shocks, toad '21MB GLA FWD on dolly
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