Please clarify the three day limit now--is that when, even with the solar on nice days, your battery runs down as far as you want to let it get down to?
-double the battery bank and keep the same solar, add some solar, or do both.
Or, is that because in Spring and Fall it hardly ever goes more than three days of nice days for solar, and the battery runs down in cloudy conditions?
-more solar won't help much if any when solar conditions are poor. Add battery and run the gen to power the battery charger until the sun comes out.