Hi everyone! 
After being unable to find a working integration for my SAJ / Elekeeper solar inverter, I decided to build one myself. I’ve been running this on my own Homey Pro for a while now, and it works perfectly!
What does this app do? It connects to the Elekeeper/SAJ Cloud API and brings your inverter data straight into Homey.
Features:
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Live Solar Power (Watts)
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Daily Yield (kWh)
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Total Yield (kWh)
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Flow cards to trigger automations based on power changes or daily yield goals.
How to use: Simply install the app and add your inverter as a device. You log in using the exact same username and password you use for the Elekeeper/SAJ mobile app. The app automatically detects your inverter and starts pulling data.
The app is currently awaiting certification by Athom, but you can already install the Test version here: elekeeper | Homey