Ham

@janek As the post above suggests we need to know the specs of panels in each string to be sure the amps and volts will work together correctly. Disclaimer: This is not an ideal situation as you have three strings with three different orientations and the Deye 12kw only has 2 trackers. Some trial and error maybe required to get the best results. Recommendation: Assuming you have the same inverter as in the original post (12kw 3phase), this has two trackers but allows three strings to be connected, two of the strings will be connected to the same tracker. Also assuming you are using the same panels in your two existing strings (southeast and southwest) I would connect these to the same tracker on string 1 & 2. I would then add your new string (northeast) onto string 3 on its own tracker. Worst case: If the two strings facing south get sun at different enough times it will hurt the output of tracker 1. You mention that the the northeast string may not make alot of power. You may end up with less power from 3 strings crammed into two trackers, then if you had just stayed with your original two strings each with their own tracker.

For anyone finding this in future, it is a bad idea to use any old installer code. This will add your datalogger to that installer's account. Unless you don't mind a random person knowing about your installation, I would not do this. If you want your own installer code use this site to register for a code: https://oss.growatt.com/login?lang=en