The most efficient way to store solar energy is by using battery storage systems.
Solar batteries (best option) :
Store extra electricity made during the day so you can use it at night. Lithium-ion batteries are the most efficient and commonly used.
Grid storage (net metering):
Extra solar power is sent to the electricity grid, and you can use it later as credit.
Thermal storage:
Solar energy is stored as heat (like in water heaters) and used later.
Pumped hydro storage (large scale):
Water is pumped uphill using solar power and released later to generate electricity.
💡 Simple Answer :
The most efficient and practical way is using solar batteries, as they store energy directly and let you use solar power anytime.