This is a very cool project!
I also have a epsolar 30a mppt with the TTL rj45 com port.
I want to monitor the contrôler with the raspi, ont only to log but mainly to control a USB relais board.
I got a solar array who can produce the maximum that contrôler accept.
Its Ok most of the time but not in deep winter.
As PV are nos under 1$/watt, i dont want to buy bigger controler nether than dirty battery expensive.
So i want to plug my main array directly to the regulator, and plug smaller array (5a) in each relay.
So when raspi mesure under 24amp for say 10mn it open the relay nb1, and so on until 29amp is reach or all the relay are open.
Same in the other way but without timing to avoid over power input.
So we can have an oversized pv field for the same battery corresponding to my need. We can even have a smaller battery park as we can charge every day. The battery is the most expensive part and short life. Pv a cheap and last really long (i'll be dead before them anyway).
I also want to dumpload the array who are not connected in a resistor to heat water or whatever, like for a windmill.
My main problem is to interface the ttl232 rj45 to the rasp. There is no software provided. Im not good enough with this to understand alone.
I also want to webcam the site cause someone burn my house once, i dont want it to happen again. And i want it to be accessible from internet, but this is the easy part.
Where should i start to begin communicate with this hardware by this kind of connector?
Thank you very much