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Icon_missing_medium
Jan 26, 2011 3:47am
2 posts

Hi guys,

I am monitoring output from 2 inverters (connected to solar systems) and household consumption across 2 phases. The production measured from the inverters does not match what is recorded on the segmeter.

I was wondering if anyone had some tips for calibrating the sensors?

Thanks,
Max

 

 
Samotage_300_medium
Jan 26, 2011 4:25am
555 posts

Hey Max,
What's the difference you are noticing?
Perhaps the answer is to determine the difference after a period of days then calculate an adjustment calibration factor and apply this to each of your solar data streams for instantaneous power and aggregated energy?
Sam.

 
Icon_missing_medium
Jan 27, 2011 7:12am
2 posts

Thanks Sam,

The difference is about 20%, which should be able to overcome with a calibration factor, but what's the best way to *accurately* calculate this factor? 

for example, do i switch off everything and run a 100W light bulb? But what if 100W globes actually 95W globes, this will throw off my factor by 5%. The logical choice for consumption is the meter (as this is what i will end up having to pay), but I don't think i can use the meter as it gives me the net after the solar. Similar situation for the solar, i can't necessarily trust the output displayed on the inverters as i am testing them.

So, how have other people calibrated their sensors?

 
Teles2012img_5162_medium
Jan 28, 2015 7:07pm
19 posts

Aloha - did you ever determine the best way to calibrate the AC sensors?

I get readings above zero when I open circuit some of my stuff.

What is the best/easiest way to permenently change the zero offset?

 

Mahalo - indatube

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