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Modified or pure?

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Old 20-06-2013, 18:01   #1 (permalink)
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Default Modified or pure?

I aim to buy a 1000w inverter and can see that pure sine wave inverters are much dearer than modified sine wave inverters so I am guessing the pure ones are better but can someone tell me what is the difference and is it best to pay the extra?

The main reason I need it is to power my low wattage travel hairdryer as it is clear from the forum that 12V hairdryers are only good for drying the back of stamps!
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Old 20-06-2013, 18:06   #2 (permalink)
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If you are only using a hair dryer than the modified will be fine.
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Old 20-06-2013, 18:19   #3 (permalink)
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Quote:
Originally Posted by Snowbird View Post
If you are only using a hair dryer than the modified will be fine.
but if i have an inverter installed it seems logical it will be used for other things so do you know what kind of appliances need the pure as opposed to the modified?
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Old 20-06-2013, 18:28   #4 (permalink)
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i have been using a 2kw modified inverter in my trailer for about 8 yrs . never found anything that didnt work on it . unless they were really big power suckers . it went wrong the other day .i bought a cheap one from ebay . again does every thing it says on the box . fridge ,computer,telly ariel drills washing machine . . i think modified is ok . others say not but i find it ok
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Old 20-06-2013, 18:38   #5 (permalink)
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modern electronics don't like modified sine wave of any source...Jennie or inverter.

Laptops, TV,s etc can't be damaged.

Now the tech bit in its most basic form

Draw a straight line on a piece of paper.
Now draw a box on top of the line and another below the line but directly after the first....repeat along the line.

This is a square wave form...electrically speaking, the 'dirtiest' form of electric....heating elements will work fine but usually not motors etc

Next, draw what looks like a bicycle helmet then another below and upside down as in the square wave..

This is a modified wave form.......cleaner than a square wave but not clean enough for electronics....heating appliances and some motors Will work fine

Next draw a half circle in place of the box or helmet then as before.

This is a pure wave form and everything likes a pure wave....same as your house electric.

Incorrect waveforms can cause excessive heat to be generated in an appliance or motor.
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Old 20-06-2013, 19:07   #6 (permalink)
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I accept what John says.

However I have never had a problem, I have charged laptops iPads and everything else for 8 years +
I've used all sorts of inverters cheap and expensive.
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Old 20-06-2013, 19:13   #7 (permalink)
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I do have an inverter wired into the van. Its 2kw pure sine wave. I only use it for the microwave and hairdryer. Everything else is charged by 12 volt, laptops, tablet, phones and the TV are 12 volt.
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Old 20-06-2013, 19:46   #8 (permalink)
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Quote:
Originally Posted by haganap View Post
I accept what John says.

However I have never had a problem, I have charged laptops iPads and everything else for 8 years +
I've used all sorts of inverters cheap and expensive.
but do you use the appliances while being charged Paul ?

Big difference between running a processor on an unclean power source and simply charging a battery on one.
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