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Old 12-14-2013, 07:19 AM   #1
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Residential Frig: Modified vs. Pure sine wave inverter

I've installed a Samsung RF197 in my coach last summer and have been extremely pleased. It is running on the stock Magnum Modified Sine Wave Inverter. What are the advantages to installing a smaller Pure Sine Wave inverter just for the frig? Will the frig use less power?

At the moment I see no compelling reason to switch it over. I'ld appreciate hearing from those who have done this inverter installation.


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Old 12-14-2013, 07:40 AM   #2
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When the frig is running, a smaller ineverte would have no advantage. When the frig is not running, the standby currunt of a smaller inverter will be slightly less than that of your current one, but the difference will be so small that you might not even notice it.

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Old 12-14-2013, 08:50 AM   #3
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Stan, I don't know about the fridge, but don't make the mistake of running a heated mattress pad with electronic controls on the MSW inverter. Don't ask me how I know!
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Old 12-14-2013, 10:08 AM   #4
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It's possible the fridge compressor will run more efficiently on pure sine vs MSW. It will probably generate less waste heat and may last longer as well. Samsung says their fridges work ok on MSW, though, so the advantage probably isn't large.

As J Birder says, a smaller PSW inverter probably has a lower stand-by current, but chances are your other inverter is still running, so adding a second one actually increases the total standby power draw.
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