I guess it's just in how the statement was put out there that I completely disagree with, a blanket statement like that kind of gets under my skin. Even worse others read it as fact and restate it every once in a while. I believe it’s a POOR system design to use a MPPT controller in the example that was referenced, low voltage and high current. Yes larger cables would be a band aid at best that might help counteract the losses but it is not the solution. If you want to sacrifice 5% by using a PWM controller again IMO a poor system design.
My system with array wattage of 550w often gives me 40 amps to the loads and once in a great while 43 amps
My point all along has been the simple fact P = 1(squared)* R
(How do you get a superscript to function here?) P=I2R
Increase the arrays operating voltage reduce the current and greatly reduce line losses associated with high currents from the array
BLF - yes indeed there is a crossover point PWM Vs MPPT- for me it's about 200 watts of array power - others have different numbers. The systems I have been involved all have had at least 270 Watts of array with a few up to 800 watts all on RV's
