I'm planning an off-grid installation with four solar panels, a SmartSolar MPPT 100/20 (48V) and a MultiPlus II 48/3000/35-32.
I'm wondering how I could monitor my system and I see (at least) two options:
1) Raspberry py
In this case I'd need to get:
- UTP cable + MK3-USB interface to connect MP II to the Raspy
- VE.direct cable + VE.direct to USB interface to connect the MPPT to the Raspy
Is that right? Or can I connect the MPPT directly to the MP II? In the latter case I don't need to buy VE.direct to USB interface
2) MultiPlus-II GX 48/3000/35-32
In this case I'd need to get only:
- VE.direct cable from MPPT to MP II GX.
Is that right? As MP II GX has only one VE.direct port, is there any other way to connect MPPTs to it, in case I will expand my system?
Do I really need MK3-USB interface with MP II GX? What's the purpose of USB port??
Which option do you suggest?
Sorry for the large amount of questions and thanks in advance for helping me to have clear ideas :-)