How true a sine wave?

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drstrip
Forum Guru
Posts: 109
Joined: Mon Jan 08, 2007 12:32 pm
My RE system: 18 x 160W BP3160 modules
2 x VFX3524
2 x MX 60
Mate/Hub/Trimetric
HUP SolarOne batteries SO-6-85-33/23 - 1690AH@24V http://www.hupsolarone.com/
Kohler 15RYG backup
Location: New Mexico - The land of enchantment and 76% of possible sunshine

How true a sine wave?

Post by drstrip » Thu Apr 04, 2019 5:35 pm

I recently bought an oscilloscope for a project, so of course the first thing I did was check out the wave form from my FX inverters. Looks like this:
Image

Compared to a sine wave from utility power, this is nasty looking. Compared to a square wave, it's beautiful. Is this representative of FX output, or does this mean I have a problem somewhere?
This was captured with the invert very lightly loaded. I can't say whether this is the inverted leg of the auto-transformer.

Surfpath
Forum Expert
Posts: 58
Joined: Wed Apr 18, 2012 8:46 am
My RE system: Outback Flexpower-1-6 system (VFX3048e, FM80, 48v, 50hz, 240v), 2,750w of PV (4 series of 3 panels/ea, 100v max-combiner to controller), 370amp/hr L16REB battery bank. Honda 2k briefcase generator. 100% offgrid.

Re: How true a sine wave?

Post by Surfpath » Tue May 14, 2019 4:39 pm

Interesting. Have you used the same instrument to measure the sine wave from your local Grid? Perhaps that would be a quick & dirty way to informally "calibrate" your oscilloscope (if you still have it).

Has anyone else measured the sine wave from their outback inverters?

drstrip
Forum Guru
Posts: 109
Joined: Mon Jan 08, 2007 12:32 pm
My RE system: 18 x 160W BP3160 modules
2 x VFX3524
2 x MX 60
Mate/Hub/Trimetric
HUP SolarOne batteries SO-6-85-33/23 - 1690AH@24V http://www.hupsolarone.com/
Kohler 15RYG backup
Location: New Mexico - The land of enchantment and 76% of possible sunshine

Re: How true a sine wave?

Post by drstrip » Tue May 14, 2019 7:54 pm

Surfpath wrote:Interesting. Have you used the same instrument to measure the sine wave from your local Grid?
Local grid? What's that? Nearest power line is about 5 miles away. :-)

But yes, I tried the scope on utility power at a different location, as well as the output from my generator. Both provided a very clean sine wave.

jponathanstarr
Forum Member
Posts: 20
Joined: Thu May 02, 2019 12:32 pm
My RE system: System 1: 15 x 290w 24v Hyundai HiS-S290RG mono panels, 5 strings of 3; 12 x 175w 24v panels, 4 strings of 3, 2; 2 x Flexmax 80s, 2 x FXR 3048s, original Mate (not very functional), Hub, Bogart Trimetric, 4 x Hup 12v x 1360 AH lead acid Batts in series.
System 2: 12 x 290w 24v Hyundai HiS-S290RG mono panels, 4 strings of 3; 20 x 75w 12v BP panels, 5 strings of 2; 2 x Flexmx 80s; 1 x Xantrix C40 on old 75w panels, 1 x FXR 2024; Cruising Equipment E-meter; GB 24v x 1576AH lead acid batt.
Location: SouthEast Maui Coast.

Re: How true a sine wave?

Post by jponathanstarr » Sun May 26, 2019 12:57 pm

I can't see any definitive steps. To me, that = good.

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