How would the solar powered cars work when the sun disappears (for example, at night or during a cloudy day)?

Question: How would the solar powered cars work when the sun disappears (for example, at night or during a cloudy day)?
- Keywords:
  car,
  dark,
  solar panel
Asked by Fletcher on 4 Jul 2023.
- Alexander De Bruin answered on 4 Jul 2023:
  
  solar panels still work on cloudy days, just not as well. Part of designing energy supply systems that use renewables is being able to store excess power generated and supply the excess power when e.g. the solar cells are not meeting the energy demand.

Question: How would the solar powered cars work when the sun disappears (for example, at night or during a cloudy day)?