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Author Topic: EMI/QRM From Enphase solar microinverter?  (Read 1958 times)
N0URE
Member

Posts: 42




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« on: July 24, 2014, 09:31:55 AM »

Does anyone have any experience with the Enphase microinverter used
on solar panel systems? Anyone know what the AC wave shape looks like?

John
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ND6P
Member

Posts: 81




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« Reply #1 on: August 14, 2014, 06:08:20 PM »

I have Chinese Enphase equivalents on my solar panels.  They do produce RFI.  I am in the process of building line filters for them to reduce the RFI as much as possible.  I've already got chokes on them to eliminate the RFI at 7 Mhz and above but they still are making RFI on the long wave and marine bands.  I'll be trying FT240-77 toroid line chokes for that, one per inverter.

These units shut down if disconnected from the grid, so there is no way to look at the output wave form on its own.  The specs on them say that the THD on the output is less than 5%.

Hope this helps.

Jim/ND6P
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W1RFI
Member

Posts: 20




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« Reply #2 on: August 18, 2014, 04:47:02 AM »

I think that the solar inverters are a potential RFI problem in the making.  Unfortunately, ARRL has received few reports, so it has not yet identified the problem brands and models.

If any ham does know of solar inverters causing RFI from a neighbor's house, please report them to Mike Gruber at ARRL HQ, rfi@arrl.org.

Thanks, 
Ed Hare, W1RFI
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ZENKI
Member

Posts: 924




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« Reply #3 on: August 30, 2014, 06:29:13 PM »

If you buy European brands like SMA.Sunnyboy  or Aurora you will have ZERO RFI problems. My whole house runs on solar using  Sunnyboy equipment and I can walk right up to the inverter installation  with my  portable receiver and not hear a peep on any band. Its incredibly good.  You wont be so lucky with the chinese garbage.

My neighbor has an  the Italian Aurora inverters and these inverters are also very good. If I walk right next door to the AUrora I can hear some birdies, however these are so low even if you were running a dipole above the inverter you would not be able to hear them.

There is huge difference between  the European designed inverters and the cheap chinese junk inverters which are unlicensed jamming transmitters they so bad.

If you a ham and wanting to install solar look at the Sunnboy/SMA products you cant go wrong.
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