Nearest big city is Leon. The highest my SCC has shown is around 550w, most of the time it 450-470watts. The panels are not shaded at all.Good to know.
This time of year, your 600W array is going to perform like a 400W array. As the days get shorter and the sun moves farther South, flat performs worse and worse. In about 6 weeks, it will perform like a 300W array.
Is any part of any panel even slightly shaded any time between sunrise and sunset?
Based on a 1.5kWh/day burn between fridge and inverter, 400W is marginal.
Can you give me a nearby city?