Rechargeable Batteries

Solar panels charge the batteries during daylight hours and the batteries supply the power when it is needed, often at night and during cloudy weather.
The two most common types of rechargeable batteries in use are lead- acid and alkaline.
Lead acid batteries have plates made of lead, mixed with other materials, submerged in a sulfuric acid solution.
Alkaline batteries can be either nickel-cadmium or nickel- iron batteries. They have plates made of nickel submerged in a solution of potassium hydroxide.