The "Indefinite" Threshold: During annual average sunlight conditions across major cities like Toronto and Vancouver, running your system at 50W, 70W, or 90W keeps you in a perpetual energy surplus. However, pushing to 110W crosses the threshold in places like Vancouver, creating a slight net deficit even on average days.
Winter Deficit Scaling: Take a look at Yellowknife's extreme winter (0.30 PSH). With next to no solar generation, your total autonomy (combining your 8.04kWh battery and the 62L gas generator) falls from 233 days at 50W down to just 95 days if you consistently draw 110W.
Calgary's Winter Advantage: Because Calgary remains relatively sunny in the winter compared to coastal or northern cities (1.80 PSH), running a highly efficient 50W setup still nets a positive daily surplus (+0.05kWh), allowing you to bypass the need for the gas generator entirely during a standard winter.