The difference between lead-acid batteries and lithium batteries for solar street lights is mainly reflected in the following aspects:
1. Energy Density: Lithium batteries have a higher energy density for the same volume or weight. , lithium batteries More energy can be stored, providing longer lighting duration. Lead-acid batteries, on the other hand, have a lower energy density and require more volume or weight to store the same energy.
2. Charging and discharging efficiency: The charging and discharging efficiency of lithium batteries is high, which can reach more than 90%, while the charging and discharging efficiency of lead-acid batteries is low, generally around 80%. %. High charging and discharging efficiency means that lithium batteries can use energy more efficiently and reduce energy waste.
3. DurationLife: Lithium batteries have a long lifespan, which can typically reach several thousand cycles, while lead-acid batteries have a shorter lifespan, which can typically only reach a few hundred cycles. Lifespan refers to the number of charge and discharge cycles a battery can complete. The longer the battery life, the longer the battery life.
4. Self-discharge rate: The self-discharge rate of lithium batteries is low, that is, when not used for a long time, the battery power loss is small. Lead-acid batteries have a high self-discharge rate, which means that when not used for a long time, the battery power gradually decreases. A lower self-discharge rate can reduce energy waste and improve battery efficiency.
5. Respect for thenenvironment: Lithium batteries are more environmentally friendly than lead-acid batteries because lithium batteries do not contain lead, a heavy metal, while lead-acid batteries contain harmful lead. The recycling rate of lithium batteries is also high, which can reduce environmental pollution.
In summary, lithium batteries have higher energy density, charge and discharge efficiency, service life and environmental friendliness than lead-acid batteries, but the cost of lithium batteries is higher. Therefore, when choosing a battery for solar street lights, you should comprehensively consider the above factors according to actual needs and budget.
The solar street light is a lighting device that uses solar energy to produce electricity. It converts solar energy into electrical energy vias solar panels, then stores it in lithium batteries for nighttime lighting. According to the requirements of the question, the light source power of the solar street light is 30W, it should be lit for 6 hours a day, and it should maintain normal operation for 7 consecutive rainy days. Now let's calculate how many amp hours of lithium batteries are needed.
First, we need to calculate the solar energy that the solar panels can collect each day. The efficiency of solar panels generally varies from 15% to 20%, and we take the average of 17.5%. So the solar energy that the solar panel can collect each day is:
30W / 17.5% = 171.43W
Then we need to calculate the power needed each night . According to the question requirements, it needs to be on for 6 hours every night, so the power required every night is:
30W × 6 hours = 180Wh
Then we need to calcalculate the total electrical energy required over 7 consecutive rainy days. According to the subject's requirements, every eveningThe power required during this period is 180Wh, so the total power required for 7 consecutive rainy days is:
180Wh × 7 = 1260Wh
Finally, we need to calculate how many amp-hours of lithium battery is needed. Ampere-hour (Ah) is the unit of current (A) multiplied by time (h), while electrical energy (Wh) is the unit of power (W) multiplied by time (h) . So we can convert 1260Wh to amp hours:
1260Wh / 12V = 105Ah
Therefore, according to the requirements of the question, the solar street light requires a lithium battery of one 105Ah capacity to ensure continuous operation for 7 days. Work normally on a rainy day.
In summary, a lithium battery with a capacity of 105 Ah is required to keep the light source of 30 litW of a solar street light for 6 hours and 7 rainy days.