I have a SmartSolar MPPT 150/45-Tr on my RV. It is connected to four 6v batteries hooked up in series parallel (12v) and six 100 watt panels in two paralleled sets of three panels in series. Between the MPPT and the batteries is #4 AWG (25mm2 ) copper with a 50a 12-24v DC breaker. It has worked flawlessly for the past couple weeks charging my batteries when they get drained and topping them off when they're not in use.
The last couple days I've found my DC breaker tripped open. I'm not sure if the 50a is just too sensitive for my setup or if there is something bigger going on.
I think the low minimum voltage listed for the battery is due to the breaker tripping because I've never seen the battery voltage dip below 11.22v on my Victron Smart Battery Sense through the VictronConnect app. And that was under heavy load during the nighttime with no solar. As soon as the load was done the battery bounced back to over 12v. As for the "#2 Battery high voltage" error, I have no clue.
As for the settings, the battery manufacturer states to add 0.005 volt per cell for every 1°C below 25°C and subtract 0.005 volt per cell for every 1°C above 25°C. So I have my MPPT set to -30mV for every 1°C. It hasn't been freezing where we are at and the Smart Battery Sense has been reading an average of 8-15°C.
I just ordered a 60a breaker to replace my 50a that may be just a touch too sensitive and I'll replace it when it comes in tomorrow.
So what do you think?