
$280 to $580 per kWh for small to medium-sized commercial projects. For large-scale, containerized ESS (e.g., 100 kWh and above), costs can drop to $180 to $320 per kWh, depending on system size, integration, and local market conditions. These numbers are affected by: Regional labor and material costs

The Sun is the at the center of the . It is a massive, nearly perfect of hot , heated to by reactions in its core, radiating the energy from its mainly as and with 10% at energies. It is by far the most important source of energy for on . The Sun has been an in many cultures. It has been a central subject for astronomical research since . . Astronomers sometimes divide the Solar System structure into separate regions. The includes Mercury, Venus, Earth, Mars, and the bodies in the . The includes Jupiter, Saturn, Uranus, Neptune, and the bodies in the . Since the discovery of the Kuiper belt, the outermost parts of the Solar System are considered a distinct r.

In many prehistoric and ancient cultures, the Sun was thought to be a solar deity or other entity. In the early first millennium BC, observed that the Sun's motion along the is not uniform, though they did not know why; it is today known that this is due to the movement of Earth in an , moving faster when it is nearer to the Su.