solar panel readout for delta inverters (my delta solar cloud)

[fzoet]

Script to read Delta solar power inverter data into domoticz.

So called "smart" energy meters are pretty dumb: as soon as you install solar panels they cannot show your actual power usage. P1 meters only show energy consumption from the grid, or delivery to the grid. They do not show the energy consumption in the house.
So they do not give any clue about possible power savings, the actual return on investment of the solar panels, or the percentage of solar power that the house uses related to grid power. Normal things a home owner wants to know to further decrease his energy consumption or to decide on extra solar panels.

To calculate the actual power usage, the power provided by the solar panels can be fed into domoticz. There are multiple ways: some cost money, some don't. Without any additional hardware investments it can be done by downloading the inverter data from the inverter website.

Robothuis has an article on this but this is limited to Goodwe, SMA (SunnyPortal), Growatt and Omnik. See https://robothuis.nl/2020/01/13/zonnepa ... -domoticz/ (in Dutch). Sándor Incze has done the programming for that, see https://github.com/sincze/Domoticz
I have an inverter from Delta though.

How can we adapt these scripts for a delta inverter / the my delta solar cloud website? (https://mydeltasolar.deltaww.com/)

[sincze]

Let me give it a try

[sincze]

You have to wait for tomorrow and hope for some sun.

Delta.PNG (14.39 KiB) Viewed 2888 times

Created the script delta_inverter.php and added that to my crontab.

Code: Select all

sudo nano /etc/crontab

added:

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*/5 * * * *   root    /usr/bin/nice -n20 php /home/pi/domoticz/scripts/pass2php/delta_inverter.php /dev/null 2>&1

https://github.com/sincze/Domoticz/blob ... verter.php

[fzoet]

@sincze Thanks! Loved the way you support this!
Next steps are calculating actual power usage, solar power percentage, and Return on Investment.

[fzoet]

Script was updated to solve this error.

Got some nice readings today but then the counter stopped at 13:05 for no immediate reason. No idea what the issue is.
Manually ran the script and get only the following feedback in domoticz log.

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2020-10-28 15:07:49.701 Status: --->> Cookie File: /var/tmp/Delta.cookie exists!
2020-10-28 15:07:49.714 Status: --->> Cookie File: /var/tmp/Delta.cookie NOT writable!
2020-10-28 15:07:49.734 Status: --->> Login OK to proceed ->

After this, no more outputs. And the dummy still is not updated.

[sincze]

It's running changed the script slightly.

Delta2.PNG (17.41 KiB) Viewed 2857 times

[pascalspits]

I also deployed the script to read my solar values, working well but it is reporting the total amount in the daily amount ... small bug ?

[sincze]

Don't have the inverter myself but total amount should be calculated with all the time.
Domoticz calculates the daily amount.
Usually it's an incremental counter only so does not like re-setting it to 0, Domoticz does that for you..

[pascalspits]

oke, I'll let it do it's thing for a few days and see what happens ...

[pascalspits]

I have 2 converters on the Growatt dashboard ... is it possible to read the 2 individual values instaed of the overall total ?

[sincze]

Growatt or Delta ?
Ofcourse if data is available the script can be tweaked to fill multiple devices in Domoticz. 1 per inverter for example.

[pascalspits]

growatt

[sincze]

ok, but why posting Growatt in a Delta thread (Script to read *Delta* solar power inverter data into Domoticz.)

[pascalspits]

"Robothuis has an article on this ...

Zelf heb ik een Growatt inverter, type 4200 en daarmee heb ik het script getest. Wat je hiervoor allereerst nodig hebt, is een inlogcode voor de Shinephone app of website van Growatt. Sommige leveranciers of verhuurders van zonnepanelen bieden je een eigen app aan als laag over de Growatt server heen, waarbij je dus andere inloggegevens krijgt. In dat geval moet je echt even vragen naar de juiste gegevens; het gaat om jouw data en die mag niet geheim worden gehouden.

Vervolgens download je het script growatt-inverter.php. Open dit bestand in een een tekstverwerker of code editor. Je zult zien dat in het commentaar al instructies staan om dit te installeren. Zo moet er in Domoticz zelf iets worden aangepast, maar ook rechtstreeks op de Raspberry Pi. Bovendien moet een aantal gegevens in het script zelf worden ingevuld. Omdat er wel wat valkuilen zijn (weet ik uit ervaring), lopen we de instructies een voor een door."