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Old 06-06-2016, 05:49 PM   #1
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Need help with Pure Sine vs Modified Sine inverters

Our 1000 watt modified sine inverter wave needs replacing. Is there enough difference between pure and modified to warrant price variation.Pros /cons of each? What brands should I consider. We need only the inverter without a charger.THANKS David
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Old 06-06-2016, 05:54 PM   #2
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Yes.

But they make great chargers for very little, sometimes no, premium.
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Old 06-06-2016, 06:00 PM   #3
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Definitely recommend a pure sine wave as all electronic devices will be happy with it. Some don't like or won't run on a modified sine wave. Might want to stop and consider whether a larger unit might be beneficial for running something like a microwave.

I really like the Magnum Energy units which have a great programable battery charger built in.

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Old 06-06-2016, 06:15 PM   #4
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The only thing I can add is that we will be happy to never own a Xantrex inverter/charger again! I'd go for the pure sine wave inverter but not a Xantrex...
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Old 06-06-2016, 06:41 PM   #5
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many appliances won't operate well using a MSW inverter. Some chargers will not only not work but will be ruined.

Given the life span of an inverter I suggest you buy pure sine wave and be prepared for more and more appliances which require pure sine wave.
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Old 06-06-2016, 07:55 PM   #6
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Quote:
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The only thing I can add is that we will be happy to never own a Xantrex inverter/charger again! I'd go for the pure sine wave inverter but not a Xantrex...
Bruce
Replaced an 18 month old Xantrex 40amp charger today. Talked to two buddies who are Certified marine electricians. One guy had replaced two near new Xantrex chargers in the last week. The other fella says he sees' the newer Xantrex chargers fail on a regular basis. My charger had a very small AC to DC leak right out of the box, in the megohm range so not going to do any damage bit both my buddies say that all the newer Xantrex units leak. My boat neighbour and pal just retired as president of IEEE, says there are design flaws in the Xantrex units.

NO MORE Xantrex on my boat !
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Old 06-06-2016, 08:51 PM   #7
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Replaced an 18 month old Xantrex 40amp charger today. Talked to two buddies who are Certified marine electricians. One guy had replaced two near new Xantrex chargers in the last week. The other fella says he sees' the newer Xantrex chargers fail on a regular basis. My charger had a very small AC to DC leak right out of the box, in the megohm range so not going to do any damage bit both my buddies say that all the newer Xantrex units leak. My boat neighbour and pal just retired as president of IEEE, says there are design flaws in the Xantrex units.

NO MORE Xantrex on my boat !
We had a factory installed Xantrex 2000 watt inverter charger fail after about 4 years...right before an offshore race...
Three replacements later we had a working replacement! The first two were DOA.
The third has been flawless but who wants to step into that mess again?
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Old 06-06-2016, 08:59 PM   #8
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"Xantrex" sounds like one of those post-modern crazy pills.
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Old 06-06-2016, 09:18 PM   #9
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2 theories on inverters.....

Go expensive and hope for the best...and I agree that a pure sine and charger with 115v switchover is a great setup...till it fails...and in my experience and what I have read...that seems all too often. Many times with trouble or no help in getting it fixed.

The other is go cheap and have a spare or several and parcel out their duties. The only electrical/electronic piece of gear I have tried to use on a modified sine inverter that didn't work was my last computer printer....EVERYTHING else has always worked...maybe at reduced power...but never a big deal. That's over 20 years and almost 10 living aboard.

So roll the dice....
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Old 06-06-2016, 09:40 PM   #10
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I retired a Xantrex and replaced it with two Magnum MS2812 inverter/charger. They have worked well. I would look at Magnum, MasterVolt or Victron. I would not install a Xantrex or ProMariner.

Sterling Power also has excellent products and very good support.
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Old 06-07-2016, 03:24 AM   #11
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Pure sine only. There are now a lot of electric devices that just refuse to operate otherwise. Coffee makers seem to lead that list, but microwaves will either not operate or have short lives sometimes, some digital clocks won't keep accurate time, other electronics will just fail. More and more modified sine is facing obstacles. The newer and fancier the equipment the less likely that it can handle it.
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Old 06-07-2016, 05:20 AM   #12
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Only go Pure!!
Three coffee machines, two electric blankets, one Samsung 34'LCD later I have learned my lesson.
And IMHO go as big as you can, you can run more stuff, boil the kettle, run the TV no problem, When underway the engines are replacing the charge.
Buy a good brand, not the cheap "to Good To be True" jobs from China, three inverters later ...I KNOW!!
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Old 06-07-2016, 05:49 AM   #13
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"EVERYTHING else has always worked.."

The pure sine waves are required for heavy motor loads Water maker, Air cond .

The modifies seen to do well with almost everything else.

If the vessel will "live" off the inverter with mostly dirt house appliances the sine wave is needed.

Of its just for occasional use like a TV or microwave, blender ,coffee pot the $150 1500W the inexpensive units will do the job as well .

What service do you require?
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Old 06-07-2016, 07:25 AM   #14
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I retired a Xantrex and replaced it with two Magnum MS2812 inverter/charger. They have worked well. I would look at Magnum, MasterVolt or Victron. I would not install a Xantrex or ProMariner.

Sterling Power also has excellent products and very good support.

Dunno if still the same, but apparently at one time most (all?) ProMariner and Sterling products were exactly the same units.

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Old 06-07-2016, 07:38 AM   #15
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I seriously consider buying a $2-$3000 inverter/charger all the time. My problem is about every time I go to do it... I hear of some cruiser having problems with theirs.

At $150 bucks, I can keep a spare or get one dang near anyplace along the loop....not so with the big boys and the Hassel with warranty issues too many seem to have.

Until I fry something or can't run something important while cruising that I like....I think I have my system the way it will be till one inverter company seems to have a break though in reliability.
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Old 06-07-2016, 08:34 AM   #16
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Why are some of you running TV's on an inverter? 12 vdc TV's has been around since the early '70's.
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Old 06-07-2016, 08:43 AM   #17
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At $150 bucks, I can keep a spare or get one dang near anyplace along the loop....not so with the big boys and the Hassel with warranty issues too many seem to have.



This is the direction I'm going with my off grid cabin. When you broaden your horizons to include 24 vdc it's amazing how little ac power is needed.

Stand on the dock and take a hard look at your boat. If it has a plate that says Nordhavn, Westport, Hatteras(you get the picture) buy a pure sine. If not well,,,, reconcile your mission with budget and buy accordingly. Walking through Costco yesterday I couldn't help but notice that you could buy about 15 32" TV's for the cost of a pure sine inverter.
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Old 06-07-2016, 10:04 AM   #18
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Just fitted a new Magum mofdified sine wave, they had no pure sine waves in stock in Tortola. The freedom I had died after some 30 years approx.
The electrician recommended the Magnum (he used to be a agent for freedom /xantrex.

The only thing that does not work well on MSW is CRT type equipment. The new magnum runs all stuff on board including al the smart TV's and other smart equipment no problem.
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Old 06-07-2016, 11:44 AM   #19
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I have an MSW 3000 watt Peak inverter.
Never would I buy a combo inverter-charger, my old Raritan converter does a good job still, it is from 1970.

Inverter has run everything, microwave, princess oven, PC, led TV, flourescent lights ok except for the 16k Cruisair heat pump.

Amazon.com: Peak PKC0AW 3000-Watt Power Inverter: Automotive

This company is now on its third iteration of that inverter. Comes with a wired remote switch.
My version looks like a double stacked inverter, inverter on top of another inverter.
I like PSW better, it works better with induction motors and transformers, otherwise, no difference.
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Old 06-07-2016, 01:00 PM   #20
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I do like Samlex tech.
Mentions these are marine rated.


One advantage of PSW is the neutral wire can be grounded, MSW inverters split power onto both neutral and hot wires. This is not a problem wiring MSW into the wire system for a boat, but is for a house, since the house has a neutral to ground panel bond. One a boat, the gen also has a neutral to ground bond, but a twin pole (120vac), or multiple pole disconnect breaks all the connections to it.

Knurlgar24 has a lot of videos on inverters
https://www.youtube.com/user/knurlgnar24
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