Is it possible to process a historical power feed into a kWh / day feed

Is it possible to take an existing feed and process its historical data into kWh / day?

im trying to work out how each of my 4 solar arrays perform at different times of the year, so I can work out whether to add tilt brackets to any of them

TrystanLea's picture

Re: Is it possible to process a historical power feed into a kWh / day feed

It is possible to use an existing power feed and process into accumulating kWh. Theres a script for this here: https://github.com/emoncms/usefulscripts

If you install this on the same machine as your emoncms installation, then navigate to the process folder and run power_to_kwh.php

$ sudo php power_to_kwh.php

It then provides on screen options for selecting the power feed, emoncms location (local) etc.

Paul Reed's picture

Re: Is it possible to process a historical power feed into a kWh / day feed

I think Kevin was looking for kWh/d feed convertion whereas the 'power to kwh' script I believe just provides accumulating kWh?

Paul

sheppy's picture

Re: Is it possible to process a historical power feed into a kWh / day feed

Paul,

you are correct, I want to create a feed that has Kwh per Day.

I want to be able to plot daily power so I can see what effect the seasons have on power production for each of my solar arrays. The sun moves around a bit down here between the seasons, and  on a Summer cloudless day I generate around 21Kwh whereas in Winter I generate around 7Kwh. I want to see what I can do to increase Winter production without compromising Summer too much. I suspect 2/3 of my capacity would benefit greatly from adding tilt mounts, but as the rest is already on tilts albeit in slightly different directions I want to compare them before I go and do the work.

If Kwh per Day isn't available I could try exporting Kwh to excel and chop it up into days there?

Cheers

Kevin

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