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Configuration calculation of Solar street lamp
- Dec 06, 2018 -

Calculate the current

such as: 12V battery system, 30W lamp 2, a total of 60 watts.

Current = 60W÷12V= 5 A

Capacity calculation

For example: Street lamp lighting time of 9.5 hours per night, the actual full load illumination of 7 hours (h);

Example one: 1-way LED lamp

(If 100% power is turned on at 7:30, the night 11:00 drops to 50% power, 4:00 after 100% power, 5:00 closes)

Example II: 2-way non-led lamps (low-pressure sodium lamps, cathode lights, energy-saving lamps, etc.)

(If the two roads are opened at 7:30, the night 11:00 closes 1, 4:00 opens 2 road, 5:00 closes) Lighting needs need to be met for 5 days of continuous rainy days.

(5 days plus lighting one night before rainy days, 6 days)

Battery = 5AX7HX (5+1) Day

= 5ax42h=210 AH In addition, in order to prevent battery overcharge and over-release, the battery is generally charged to about 90%, discharge residual 5%-20% or so. So 210AH is just about 70%-85% of the real standard in the app.

In addition, according to the different load, the actual loss is measured, the actual working current is affected by constant current source, ballast, line loss and so on, may increase on the basis of 5 a 15%-25%.

Peak calculation

The cumulative lighting time per night for street lights takes 7 hours (h);

★: On average, the battery board receives an effective illumination time of 4.5 hours per day (h);

At least relax the 20% reservation required for the battery board.

WP÷17.4V = (5ax7hx120%) ÷4.5h

WP÷17.4V = 9.33

WP = 162 (W)

★:4.5H daily illumination time is the sunshine coefficient in the area near the middle and lower reaches of the Yangtze River In addition, in the Solar Street lamp assembly, line loss, controller loss, and ballast or constant current source power consumption are different, the actual application may be around 15%-25%.

So 162W is also only a theoretical value, according to the actual situation needs to increase.

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