Hi, I'm new to all this and am trying to set up my system.
Most likely I will be installing 2 sets of 3x18V 5.5A panels in parallel, each to a MPPT 100/20 charge controller.
It looks like the 150/45 has more functionality, like being able to attach a battery temperature sensor, and having a relay. Aside for the fact that I could then connect all these into 1 MPPT, is it the case that it has more functionality? (It will be a LiFePo4 battery)
I usually advise to get the highest capacity charge controller that fits your budget.
The 150/45 will serve you better in the long run as it will allow your system to expand if it is not initially used to full capacity.
Relay output and remote on / off are useful features. There is no external temperature sensor on the 150/45, the temperature sensor is internal.
Did you read somewhere that it's possible to attach an external sensor?
I guess I must've read wrong. This is all new to me.
From what model onwards is there the capability to add the external sensor? Or can I do this through a bluetooth battery sensor (does that exist?)?
@WKirby: Specifically, since it is a bluetooth mppt, can I use a Smart Battery Sense?
