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patience4711 / read-APSystems-YC600-QS1-DS3

Software for an esp8266 nodemcu to read data from APS inverters.
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Callibration factor for DS3-L #31

Closed karlheinz2000 closed 2 years ago

karlheinz2000 commented 2 years ago

This is to report the calibration factor for DS3-L. I did bench measurements with DS3-L connected to a power supply in cc mode. AC power was recorded with a LMG450 power meter. DC voltage was set to 30V, DC current was adjusted to get the desired AC power in 50W steps from 50W to 350W. Only one input was connected.

grafik

Out of this table 1.66 is a good match. Below 150W reported power is not linear. I verified this factor with 2 DS3-L.

Also DC current needs callibration. The reported values on INFOPAGE are not correct. DC current was measured as part of power measurement from above (50..350W).

grafik

A factor of 1.25 gives good results.

I wonder if these factors are also transmitted via zb? How does a APSystems ECU calculate correct values?

patience4711 commented 2 years ago

@karlheinz2000 Thanks for taking the trouble to get this factor right. What is transmitted by ZB you can see in the polling answer. That gives us a value we have to decript into a correct energy value, that is what the software does. How it is done by APS? When we knew that..... Did you conduct these tests to both channels?

karlheinz2000 commented 2 years ago

Complete set was done for one channel only, but I verified one point on 2nd channel.

lumbsta commented 2 years ago

@patience4711 I can confirm @karlheinz2000 's power conversion factor of 1.66 with 2 modules attached. My daily solar production is now almost equal between ESP ECU and Shelly 1 PM.

patience4711 commented 2 years ago

@lumbsta Oke, now we are getting somewhere..