Panel watts are not daily energy
A 400W panel does not produce 400W all day. Use realistic sun hours and allow losses.
Solar charging explained
Solar keeps a power station useful for longer, but real output depends on panel watts, sun hours, angle, weather and input limits.
Input limit matters
The station controls how much solar it can accept. Extra panel wattage only helps if the input supports it.
Best uses
Solar is strongest for camping, RV travel, remote work and outages longer than one day.