What is Voltage ?
When two poles of battery is connected, namely positive and negative it creates pressure, which in turn activates electron flow. This pressure is measured in volts. Other terms used are electric potential difference or electromotive force.
Types of Voltages:
Direct Current (DC) is produced from Solar Panels and stored in batteries.
- Alternating Current (AC) Voltage : This kind of voltage are bidirectional (reversing positive and negative over time). Periodically Alternating Current reverses the direction. Hence voltage level also reveres along with the current.
- Direct Current (DC) Voltage : It is unidirectional. Electric charge (current) only flows in one direction.
Types of Battery and Voltage Used in Solar Lights:
Advantages and Disadvantages of Battery Voltages:
Lead Acid Battery : Generally these types of batteries are made of 6 cells connected in series. Each cell produces voltage of 2 to 2.1 Volts. Hence , voltage of lead acid battery is 12 Volts.
Lithium iron phosphate battery (LifePO4) : Unlike lead acid batteries this have 3.2 volts per cell. Only 4 cells are required to generate nominal voltage of 12.8 volts.
Lithium Ion (Li-ion) : Each cell produce 3.7 Volts.
With the discharge there is drop in voltage of Lead acid battery. However , Li-ion and LifePO4 produce constant output voltage.