Which type of battery is good for solar street light batteries?

Which type of battery is good for solar street light batteries?

Batteries are energy storage devices for solar street lights. Currently, batteries used in solar street lights include lead-acid batteries, gel batteries, ternary lithium batteries, and lithium iron phosphate batteries.

Firstly, let's take a look at the characteristics of these types of batteries:

1. Lead acid battery: The plates of a lead-acid battery are composed of lead and lead oxide, and the electrolyte is an aqueous solution of sulfuric acid. Its main advantages are stable voltage and low price; The disadvantage is that the specific energy is low (i.e. the amount of stored electricity per kilogram of battery), so the volume is relatively large. And it is not resistant to low temperatures. The normal temperature service life is about 300-500 deep cycles, while the service life is shortened by half at low temperatures. Frequent daily maintenance is still widely used in the solar street light industry, but it will gradually be phased out.

2. Colloidal battery: In fact, it is an upgraded maintenance free version of lead-acid batteries, which replaces sulfuric acid electrolyte with colloidal electrolyte. It has improved safety, storage capacity, discharge performance, and service life compared to ordinary batteries, and some prices are even higher than ternary lithium batteries. It can be used in the temperature range of -40 ℃ to 65 ℃, especially with good low-temperature performance, suitable for high-altitude regions in the north. Good seismic performance and can be safely used in various harsh environments. The service life is about twice that of ordinary lead-acid batteries.

3. Ternary lithium batteries: high energy density, small size, fast charging, and high price. The deep cycling frequency of ternary lithium batteries is about 500-800 times, and their lifespan is about twice that of lead-acid batteries. The discharge temperature range is -15 ℃ -45 ℃. The disadvantage is that due to its high density, it is not very stable and can easily catch fire and explode if used improperly.

4. Lithium iron phosphate battery: small size, long service life, good stability, high temperature performance, large capacity, high charging and discharging efficiency, light weight, environmentally friendly and pollution-free, of course, the price is also high. The deep cycle charging frequency is about 1500-2000 times, with a long service life, generally up to 8-10 years. It has strong stability and a wide temperature range, and can be used at -40 ℃ -70 ℃.

In summary, it is best to use lithium iron phosphate batteries for solar street lights, but the price is relatively high. At present, the use of lithium iron phosphate batteries as energy storage batteries for solar street lights is also increasing in the market. In the future, it may replace lead-acid batteries as the main force of solar street light batteries.