Hi all. I purchased the Must PV-18 1012 VPMll inverter. It floats on 14.3v with no way to change the setting. I tried solar power monitor but when I change the float value, I get an error. I watched a you tube video and he says to insert a comma. Eg. 13,4 instead of 13.4. It accepts the value but when you go back in, it's back to 13.8v Anyone else have this issue.