Most families in Haiti buy the wrong kit: too small, and the fridge warms up by evening; too big, and the extra money is wasted. Tick what the home runs, and the checker does the daily math the way an installer would.
The checker adds up one day of use in watt-hours, then sizes the panels for about 4.2 good sun hours a day in Haiti with a safety margin, and the battery to carry the home through the night. When our solar shelf opens, these are exactly the four kit sizes it will sell — sized first, sold second.