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MichaelHeimann / OpenNETek

make newenergytek inverters (SG600MD etc. ) wifi ready (http + mqtt)
MIT License
5 stars 1 forks source link

reported power seems to be only half of the truth #4

Closed MichaelHeimann closed 1 year ago

MichaelHeimann commented 1 year ago 
          Thanks for your reply and of course for your work with Opennetek Michael,

I didn´t know that inverter only has one mppt... I have to do more tests but yesterday with a lot of sun, panels current was 10 amps and voltage 27V (more or less 270W) with opennetTek and almost 500W measured in AC with a smart plug that gives you consumption.. Because of that I thought it was measuring only one panel.... I will do more tests....

Originally posted by @essrirm in https://github.com/MichaelHeimann/OpenNETek/issues/3#issuecomment-1570277757

MichaelHeimann commented 1 year ago

Hi @essrirm ! I've today seen acP numbers far above 400W on a sg700 which has a rated output of 650W. So 50% can be ruled out.

I'll go and connect my inverter to a shelly plug instead of just measuring the phase in the breakerbox together with all other consumers.

Can you reproduce getting far lower numbers on the opennetek webpage than on a connected smart plug?

Regards, Michael

essrirm commented 1 year ago

Hi,

I did more tests and problem was that smart plug with Tuya app had a lot of delay.

It seems that smart plug usually gives you more generation, but it is like 10% more, not double. It could be because smart plug is really cheap...

MichaelHeimann commented 1 year ago

I finally could test my inverter with a shelly plug s and the shelly did report e.g. 364W when the inverter reported 443W.

So there is quite a difference of somewhere around 10 to 20 percent.

I think this might be the (in)efficiency (output vs input) but I do not know for sure.

Surely not 50%.