I read the rs450 has 3 x 4kW max and 11.5kW total max
but maybe you will hit that 11.5kW across 4 strings if you had 3kW on each
cause mine maxes out at 10.7kW. 2 of the strings reach peach 4kW and 3rd string is 3.3kW. it’s not a panel problem cause the charger alternates from time to time which of the strings to reduce by 700W
so not sure if that’s normal or bad setting or needs update
Could be the difference between pv watts (input) and battery watts (output). You can calculate the efficiency of the rs450 that way. My 450/100 “loses” a lot more than my 250/100. If you have enough panels its not too bad.