When choosing the right battery for a solar street light, you need to consider factors such as lighting conditions, power requirements, ambient temperature, budget, and maintenance costs:

1. Determine key parameters

Before selecting a battery, you need to clarify the following system parameters:

Street light power (W): such as 20W, 30W, 50W, etc.

Daily lighting time (h): such as 8 hours, 12 hours, etc.

Rainy days: usually 3 to 5 days (to ensure continuous cloudy days).

System voltage: commonly 12V or 24V (matching with solar panels and controllers).

Battery type: Common solar street light battery types include lithium iron phosphate (LiFePO4), lithium-ion batteries, lead-acid batteries, and colloidal batteries. Among them, lithium iron phosphate batteries are widely used due to their high energy density, long life, and good safety.

Capacity and discharge rate: The battery capacity determines the battery life of the solar street light. The capacity usually ranges from 20Ah to 200Ah. The specific selection depends on the project requirements. The discharge rate affects the efficiency and service life of the battery.

Service life and cost: The initial cost and long-term use cost of the battery should also be weighed when choosing. Although lithium batteries are more expensive, their long life and low maintenance costs may be more economical in long-term use.

Environmental adaptability: Choose the appropriate battery type according to the use environment. For example, in extreme climate conditions, batteries with better temperature resistance should be selected.

Other characteristics: such as the number of times the battery is charged and discharged, the charging speed, etc. should also be considered to ensure that it can meet the actual use needs.

In summary, lithium iron phosphate batteries are usually the best choice for solar street lights, especially when high efficiency and long life are required. It is very important to make a reasonable choice based on the specific project needs and budget.