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Pure Sine Wave or Modified Sine Wave?

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    Pure Sine Wave or Modified Sine Wave?

    Is there any advantage to utilizing a pure sine wave inverter vs a modified sine wave one for charging on the road. I have a Luna 48V Advanced charger I want to use in my RV. The question is not do I have the power I need (the chassis alternator puts out 2000W), just should I use a cheap(er) MSW inverter or PSW one?

    #2
    When camping, I run two Luna Advanced chargers off an old Modified Sine Wave inverter with no problems. It's a Vector Maxx 750/1500, nothing fancy.
    Fabrication is fun! Build something today. Show someone. Let them help. Inspire and share. Spread the desire.

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    • JPLabs
      JPLabs commented
      Editing a comment
      Camping last weekend, I had some trouble getting my chargers to run off this. Starting the engine and wiggling the battery clamps worked sometimes. So, I revise this to 'can work OK'.......not 'no problem'.

    #3
    Boy , I am really struggling on this one. I was set to buy a cheap MSW inverter for myself but also to use at the cemetery I take care of to run a hammer drill and maybe a few other tools.. But all the videos I have been watching say they will run on MSW but run smoother and like PSW a lot better. They say PSW is better for more sensitive electronics. Do a go the cheaper route a get by for a while or put the money towards a PSW ???????

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      #4
      I went cheaper first, figuring I'd upgrade when I came across something I can't run. I never tried a high amp tool like a hammer drill, but the only thing I have failed to run so far is a large transformer power supply for my short-arc searchlight. Only 300W, but the starting inrush current is too much for the inverter. For that, I think it's just a matter of capacity, though, not Sine type.

      I still haven't upgraded.

      For what it's worth.
      Fabrication is fun! Build something today. Show someone. Let them help. Inspire and share. Spread the desire.

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        #5
        Mod sine will run the Luna charger just fine, I use one, 400 watts (I charge at 3 amps) driving down the road all the time. So, if running the charger is ALL you want to do, a POS Harbor Freight modified sinewave one (none cheaper) will do the job just fine. Having said that, unless you are on a strict budget, pure sine wave types offer many advantages, and they have come down in price a lot in recent years. You mention you have an RV? Get a quality pure sine wave one, NOT a Harbor Freight POS, something like this: http://www.backwoodssolar.com/samlex-1000w-12v-inverter. It's a name brand, not the most top dollar full featured type of inverter, those will cost you double. Something like this:http://www.backwoodssolar.com/samlex-1000w-12v-inverter. Magnum makes great stuff, I've installed a lot of them in my renewable energy side line racket, a US based company. I bought the Harbor Freight one fully knowing better, what a piece of junk it would be, but for the money (can't remember exactly, way less then $100.00, maybe $50.00) I thought it would be fun to see how long it lasted.

        To my surprise, it's hung in there just fine! Running any type inverter is most efficient at about 75% of it's rated power. You don't want, though you can, to run a 30 watt load off a 3,000 watt inverter. The 400 watt cheapie is sized about perfect for the 3 amp setting I use on the Luna charger.

        It's oddly satisfying to be driving down the road in a car, while charging your e bike, knowing that if the drive gets boring enough you can pull over and go for a (fully charged) ride. Having that capability of on the go charging is a must have for me.

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