Brian_

Thanks for the help I will definitely try that

I'm using watch power 1.14 with the rs232 cable that was provided with the inverter and its connected to a rs232 to usb converter cable that I bought from matrix I know the comport is fine but as for the bit rate and check sums I have no knowledge

Good day all, I'm new at solar. I bought a sunmagic 3kva inverter it looks like the sun pays and axpert inverter and has an identical user manual, the problem is I can't change the programming the manual says push enter button 3 seconds I've done this several times and the button does make a beep when pushing it but the inverter doesn't go into programming and it also won't communicate through the rs232 cable. The inverter works but it's in utility first mode even when disconnecting the utility it works perfectly with the solar and batteries, I'm basically just trying to set it to solar first. Any advice? Thanks