Got a little further with this
on 9600 baud on the rs485 im getting somewhat reliable results. i figure out what the start and stop bytes are and have got data now to play with.
i have done a few comparisons of the voltage/current against the values
17,80,15,15,17 = 12.50V / 0.0A
17,80,28,15,1D = 12.34V / 0.6A
17,80,B,15,1D = 12.50V / 0.6A
17,84,2,15,1D = 12.50V / 0.7A
17,8A,1,15,1D = 12.32V / 1.9A
17,0,0,15,1D = 12.30V / 2.0A
17,80,1,15,1D = 12.34V / 2.0A
17,0,29,15,1D = 12.25V / 2.2A
17,80,29,15,1D = 12.26V / 2.2A
17,14,2B,15,1D = 12.20V / 2.2A
17,80,2A,15,1D = 12.19v / 2.2A
17,A4,2A,15,1D = 12.20V / 2.3A
17,80,1,15,1D = 12.18V / 2.4A
17,80,0,15,1D = 12.19V / 2.4A
17,84,A1,15,1D = 12.19V / 2.5A
17,84,A3,15,1D = 12.18V / 2.5A
17,0,A2,15,1D = 12.17V / 2.5A
17,0,80,15,1D = 12.17V / 2.6A
Im seeing a pattern but im not exactly sure what to do next, does the information jump out at anyone here? Some of those bytes may be more information than just the voltage and current, but that's all im interested in extracting.