How true a sine wave?

Discussion about OutBack Inverters in Off Grid Applications

Moderators: OutBack, OutBack Moderator Team

How true a sine wave?

Postby drstrip on 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.
drstrip
Forum Virtuoso
 
Posts: 95
Joined: Mon Jan 08, 2007 1:32 pm
Location: New Mexico - The land of enchantment and 76% of possible sunshine
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

Re: How true a sine wave?

Postby Surfpath on 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?
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?

Postby drstrip on 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.
drstrip
Forum Virtuoso
 
Posts: 95
Joined: Mon Jan 08, 2007 1:32 pm
Location: New Mexico - The land of enchantment and 76% of possible sunshine
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


Return to Off Grid Applications

Who is online

Users browsing this forum: No registered users and 2 guests