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Inverter question.

For all things Electrical.

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Inverter question.

Post by M1S3RY »

Just been checking out inverters on Ebay, and i was wondering if someone could tell me the difference between a pure sine wave and a modified sine wave inverter (Beside the cost) ;)
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Post by murcod »

Some electrical appliances don't like operating off a modified sine wave. Pure sine wave is the same as the power out a normal home socket.
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Post by M1S3RY »

murcod wrote:Some electrical appliances don't like operating off a modified sine wave. Pure sine wave is the same as the power out a normal home socket.


Is that when the top and bottom of the wave is clipped so you only get ~230v ?
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Post by Rainbow Warrior »

M1S3RY wrote:
murcod wrote:Some electrical appliances don't like operating off a modified sine wave. Pure sine wave is the same as the power out a normal home socket.


Is that when the top and bottom of the wave is clipped so you only get ~230v ?


What you actually get is a wave that is square with gaps to aproximate the same average power, how well it aproximates it is dependant on the quality. It only becomes an issue when running motors. I can run a 900kw compressor motor off my 1700w inverter, it's a non sine wave, when the compressor was new I had to make sure the head pressure was nearly zero or it would stall on startup, no problems now. I can run the house fridge fine. But it a 700w sandwich toaster or microwave only work at half heat. 850w circular saw was also a bit gutless. Everything else, battery chargers, computer, pedestal fans, TV, video, DVD all run fine, I do get slight lines in TV pictures though and background hum in some stereo's.
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Post by murcod »

Rainbow Warrior wrote:I can run a 900kw compressor motor off my 1700w inverter


That's a bloody powerful compressor and amazing inverter! :D
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Post by Rainbow Warrior »

murcod wrote:
Rainbow Warrior wrote:I can run a 900kw compressor motor off my 1700w inverter


That's a bloody powerful compressor and amazing inverter! :D


Should see the amps pulled by the batteries :D
900w is more believable.
Pat,
Brisbane, Australia,
JK 4door Rubicon, currently 4 Sale :(
It's a Jeep thing, I don't understand........
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