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solar street light battery

Solar led street light battery capacity

With the continued development of solar-led street lights, solar street light battery types changed from lead-acid batteries to lithium batteries. So how to calculate the battery capacity of solar-led street lights?

Many manufacturers use 20AH lithium batteries with a false mark capacity to impersonate 80AH to customers, access to large profits, 2014 to 2016, many manufacturers earn a lot of profit by lithium batteries these years.

solar led street light battery

12V 60Ah lithium battery, for example, the normal use of 3.7V 2Ah cells, 60Ah ÷ 2Ah × 3 = 90 section. When you learn that a 90-section cell has a 12V 60AH capacity, cutting corners requires another upgrade.

Yes, the battery cells give you 90-knot cells, but quietly give you 3.7V 1AH instead. At this point, the capacity is only 30AH, and all of a sudden a lot of cost reduction, for dishonest businesses, this could be profit, or a nuclear weapon to seize the market.

So it is very important to know how to calculate the solar street light battery capacity, sometimes you can avoid being cheated.

How do you calculate the configuration of lithium-ion battery solar street lights?

Let’s take a 40W LED light source as an example: the customer requires 8 hours of lighting per day, and 3 days for rainy days.

Let’s take the 18650 lithium ternary battery as an example.

Known conditions: the nominal voltage of a lithium-ion secondary battery is 3.7V; the system voltage of a 40W LED light source is 12V; the platform voltage of three lithium-ion batteries combined in series is 11.1V, and the standard charging voltage of the battery plate is 17.5V.

Let’s popularize the conversion of Ah (amp-hours) to Wh (watt-hours) units.

Wh (watt-hours) and Ah (amp-hours) are both ways to measure battery capacity is a measure of the capacity of an electrical storage device, meaning that the product of current (amperes) and discharge time (hours) in units of capacity [AH] can be satisfied by conforming to the discharge curve (a similar inverse proportional curve).
We often see a number in Wh next to the mAh.
The work done by the battery W = UIt = voltage (V) * current (A) * time (h).
Voltage U*Current I=Power P (Watt, letter “W”)
Therefore, the work done by the battery W=P*t, the unit is Wh.
Ah = Work (W)/Voltage (U)

Daily power required by 40W LED light source = 40W*8H=320Wh
The solar street light design needs to take into account the day’s rainy weather conditions, for example, 3 days in Nanjing design.

Then 3 days 40W LED light source needs total power = 320Wh * (3 + 1) days = 1280Wh
Then lithium battery capacity = work (W) / voltage (U) = 1280Wh/11.1V = 115AH

Through the calculation of solar street light battery capacity, the next time we buy solar street lights, we can better identify whether the manufacturers deceive us, so as to buy a good price, more suitable for our products.

battery of solar street light

Four kinds of solar street lights batteries?

Solar batteries are the main accessories in solar street lights. Currently, there are four types of batteries: lead-acid batteries, gel batteries, Li-ion lithium batteries, and LiFeP04 lithium batteries. The four types of batteries are commonly used in solar street lights. Which battery is the best? Let’s take a look at the characteristics of these four batteries:


 Lead-acid battery

Lead acid battery


The plates of lead-acid batteries are composed of lead and lead oxides, and the electrolyte is an aqueous solution of sulfuric acid. The main advantage of lead-acid batteries is that the voltage is relatively stable and the price is relatively cheap; the disadvantage is that the specific energy is relatively low, so the volume is much larger than ordinary batteries. The service life of lead-acid batteries is relatively short, generally 300-500 deep cycles. Maintenance is relatively frequent, but because of the price advantage, it is still widely used in the solar street lamp industry.



 Gel battery

Gel battery


It is equivalent to an upgraded version of a lead-acid battery. It is maintenance-free and solves the frequent criticism of lead-acid battery maintenance. Internally, the colloidal electrolyte is used instead of sulfuric acid electrolyte, and the storage capacity, discharge capacity, safety performance, and life are improved. , But sometimes even surpass the ternary lithium battery in terms of price. The gel battery can be used in the temperature range of -40 ℃-65 ℃, the low-temperature performance is better, and it can be used in the northern cold regions. It has good seismic performance and can be used safely under various harsh conditions. The service life is double or even more than ordinary lead-acid batteries.



 Li-ion lithium battery

Li Ion battery
The advantages of  Li-ion lithium batteries are many. It has a high specific energy, small size, fast charging, and high price. The number of deep cycles is about 500-800 times, the life is similar to that of gel batteries, and the temperature range used is -15℃-45℃. However, the ternary lithium battery also has disadvantages, and its battery is not stable inside. If it is a  Li-ion lithium battery produced by an unqualified manufacturer, it may happen that it may explode during the overcharge processor in a high-temperature environment. 




LiFeP04 Lithium  battery

solar street light battery price

LiFeP04 Lithium battery is a battery that integrates many advantages. It has a higher specific energy, small size, fast charging, long service life, and good stability, but the price is the highest of all batteries. The number of deep cycle charging is generally 1500-2000 times, a group of lithium iron phosphate batteries under normal use, can generally be used for 8-10 years, can be used in an environment of -40 ℃ -70 ℃, the use of temperature The scope is relatively wide.

1. The charge and discharge times of LiFePO4 Lithium battery are 2000 times, but Li-ion Lithium battery is only 800 times. The lifespan of LiFePO4 is 2.5 times that Li-ion.

2. In hot summer LiFeP04 Lithium battery is stable, but the Li-ion Lithium battery is easy on fire.

3. LiFePO4 battery is twice expensive as the Li-on lithium battery and more stable. The lifespan of LiFePO4 is 10 years, Li-ion battery is only 4 years.

Conclusion

It can be concluded from this that the use of  LiFeP04 Lithium battery in solar street lights is of course the best, but the price is relatively high. LiFeP04 Lithium battery is a domestically developed energy storage battery with mature and independent property rights.

There are many manufacturers, and the use conditions and safety protection are also very well done, so the use of a lithium iron phosphate battery is the best choice. Questions about solar street lights and solar batteries are welcome to interact with Belinda or Clodesun.com.