SMK
I believe you have different panels that what I have - I have 550 watts in a series parallel configuration that regularly gets me 40 amps to the loads and has on occasion given me 43 amps to the loads. I personally would not use a 45 amp controller in that situation, mine is the 60 amp version. I do not believe it's a good design to max out the units they die from heat exhaustion early when pushed that hard.
BLF
Limiting or clipping is an attempt to save its life - running them at max current the temperature rises and heat destroys things quickly
Easy fix - design a system with some head room if you have a 600 watt array use a 60 amp controller - no worries ever
Let’s say I have 4 different 600 watt arrays that I can use
1 - A 100 VDC array that can supply 6amps (600 watts) - works great with an MPPT controller and the low array current to controller has very little line losses. Easy to hide away smaller wires and flexible wire no need to use "00" cable
2- A 50 VDC array that can supply 12 amps (600 watt array) again works great with a MPPT controller
3 - A 25 VDC array that can supply 24 amps (600 watt array) again works great with an MPPT controller
4 - Finally the PWM gets to play in the game - a 12 VDC array with a MASSIVE 50 amps of current and requirement for HUGE wires to compensate for extensive line losses
