rjxj, fisherguy,
PV arrays can be larger than the controller input rating under certain circumstances. The controller needs to be able handle it but it can be done.
I have said this several times on here over the years but no one pays attention to it.
Solar installers do this all the time on residential installations. I have 15KW of PV on my home but only 13KW of inverters. Not a problem.
I am about to install 500 watts of PV array on my new RV with a 30 AMP MPPT controller. With the same controller I had 420 Watts (flat) and the most I ever saw was 27 amps out of the controller.
NOW, not all controllers will let you get away with this. I know Morningstar will. So will Blue Sky with solar boost. I believe my Rogue 3024MPT will also. Some lower cost controllers have no limit on the input and will simply shutdown when the output exceeds its limit. So I am not recommending this to anyone. Again, I am not recommending this to anyone. Know your equipment.
There are several real advantages to having a slightly oversize array. Better production on cloudy days, longer maximum daily production. There is also a point of diminishing returns so don't over do it.
