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Modified sine wave to pure sine wave converter?
Is there a converter out there that can take the modified sine wave output from our inverter and convert it to pure sine wave. I’ve had to replace one circuit board in our two-year old refrigerator, and I’m wondering if it an issue with the modified sine wave output from our inverters. Would be nice if I could plug in the converter in the outlet, and then plug the refrigerator into the converter. The refrigerator only needs 1,200 watts, so it would not need to be a large unit.
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19 Replies
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What brand is your 2 year old fridge?
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It’s a General Electric.
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I’m not certain any particular brand is adversely affected by modified sine wave inverters as much as the issue might be in the components used.
It is my understanding some refrigerators have compressors that experience premature failure and others have control circuits similarly affected.
One thing however is probably a certainty….if you ask an appliance salesperson if it OK to use the appliance he is selling on modified sine wave inverters the answer is always going to be yes.
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Just had a 6 year old Frigidaire go out before I put the Magnum Pure Sine in to replace the Modified Magnum I had installed at the same time the Fridge was. Don’t know as it could have been that the Fridge was made in Juarez Mehico.
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The quick answer is no, there is not such a device. You can likely quickly replace your MSW inverter with a TSW inverter without much, if any, wiring changes required.
My old GE has run just fine on MSW for many years but I don’t know anything about the new ones.
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We just got back from a 5 week 6000 mile trip and 1 of my old black Xantrex heart charger/inverters stopped charging luckily there is 2 so #2 took care of charging, Those black inverters can’t be fixed and #1 is the side of inverting for the refer. I have a old Whirlpool refer that works great but I will have to change it down the road, So I thought If I’m going to change #1 inverter Should I put in a Pure Sine Wave inverter in it’s place and what is a good dependable unit??
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If anyone has to replace an inverter the only way to go that makes sense is to use a pure sine wave.
Ten or fifteen years ago we never had this conversation since various electronic devices from coffee makers to TVs to refrigerators to various devices we plug into the outlets were OK on modified sine wave.
Today we do not know what devices require pure sine wave and it just seems we find more and more devices that suffer premature failure because they do require it. It is certain more and more devices in the future will require it.
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There are filters that turn pulse width modulated waveforms back into sine waves. They are commonly used for (very) large motors that are controlled via pulse width modulation. Just search for sine wave filters but most are for large 3 phase motors ($$$).
If you are electronically inclined you can probably come up with a high frequency filter (either an LC or RC network) for the small amperage draw of the fridge.
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Re booted and Blew out the dust and the inverter is charging again
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Art
I just went thru the same thing with my 97XL Royale. #1 inverter stopped inverting, so I moved sub panel breakers so the fridge would run off of #2.
Cleaned and run ok for a bit. Then #2 stopped charging….I had Inverter Service in White House, Tenn pull the Freedom 25’s and put in 2 Magnum 2812’s PSW units.
Art they can be repaired but why….they like mine were 20yr old and the new technology is far superior.
Jonathan Fine
97XL Royale #201 -
I agree, I did mobile rv service for 7 years and I replaced or had repaired many old inverters what is the size of the Magnum 2812 inverter? will it fit in the same area as the freedom inverter?
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Art
In my Royale electric/battery bay I had to move the AUTO START GREY BOX, to the ceiling above the 24v charger which is on the right side of shelf. After doing that the crew had enough space to mount the 2 new 2812’s where the 2 Freedoms were.
I have a question maybe you know Art….the FET temp on inverter #1 is hot…158-160º the fan is on. Inverter #2 stays under 111º and no fan running.
Inverter #1 has the most constant draw.Jonathan
97XL40 Royale #201 -
If you do not provide ample ventilation such as by not realizing the inverter fan has quit the heat build up will shorten the life of the inverters. Additionally, through use the fan draws lint, dust and other debris into the inverter which builds on the inverter internal components adding to the problem.
I would urge periodic fan checks as well as regular cleaning, inside the inverter enclosure. All that requires is a little blast of air to loosen and get rid of the internal dust and dirt.
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Art,
here is the new arrangement………….
Jonathan Fine
96/97 Royale #201
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