Some calculations scribbled here on my notepad:
220AH 2x FLA Duracell GC2
70.3AH projected daily consumption. This would be 103.4AH but 33.1AH is moved to the opportunity circuit.
52.7AH of this will be overnight use (when no solar charging at all is happening). Estimating 75% SoC at daybreak.
570.0W nominal peak
427.5W derated peak under clear skies (nominal peak x .75)
85.5W under overcast/rainy skies (derated peak x .20)
42.8W under very dark, overcast/rainy skies (derated peak x .10)
64.1W at sunrise/sunset under clear skies (derated peak .15)
12.8W at sunrise/sunset in overcast/rainy skies (derated peak .03)
Sunrise/sunset efficiencies taken from this experiment
Rated output 40A
Max voltage 150V
Max wattage for 12v bank 520W (will tolerate overpaneling by moving off Imp)