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AMD Damo
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12V inverter - pure sine wave or modified?

Mon Apr 09, 2012 5:43 am

Hello guys, I've got a question regarding inverters and computers, I'm looking at getting a 1000W inverter to run computers, possibly screens and some other appliances from a 12V source.

With computers, is a pure sine wave inverter nessessary? Or can I get by with a modified sine wave one? There is a big price difference between the two.
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Bensam123
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Re: 12V inverter - pure sine wave or modified?

Mon Apr 09, 2012 6:50 am

Pure sine if you use computers with active PFC on the PSU. If they use passive it doesn't matter, but active PFC throws a fit with a modified sine wave.
 
bryanl
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Re: 12V inverter - pure sine wave or modified?

Mon Apr 09, 2012 12:25 pm

All inverters are modified, or rather constructed, sine wave to some degree or another.

Consider the typical UPS for computer equipment. It uses an modified sine wave inverter.

So called 'pure sine wave' inverters have become less expensive in recent years and that label usually indicates a better quality inverter but good quality MSM types do exist and are usually more efficient.

The most problematic equipment when it comes to modified sine wave inverters are some of the less expensive wall warts.

The influence of load power factor can be interesting but it is mostly an efficiency issue. Again, the typical UPS and the equipment it usually protects can provide a clue here. There aren't many power supplies that give much attention to power factor. That is why the UPS is often rated the way it is.
Bryan
 
AMD Damo
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Re: 12V inverter - pure sine wave or modified?

Tue Apr 10, 2012 7:11 pm

How do I tell if my PSU has active PFC?
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bryanl
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Re: 12V inverter - pure sine wave or modified?

Thu Apr 12, 2012 12:30 pm

AMD Damo wrote:
How do I tell if my PSU has active PFC?


they'll brag about it in marketing hype if what I see is any indication
Bryan

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