Give you a reference for the calculation formula of solar panel and battery configuration. Solar panel and battery configuration calculation formula
1: First calculate the current:
For example: 12V battery system
2 30W lamps, a total of 60; watt.
Current=60W÷12V=5A 2: Calculate the required battery capacity:
For example: the cumulative lighting time of a street lamp should be 7 hours ( h) fully charge every evening;
(For example, turn on at 8:00 p.m., turn off channel 1 at 11:30 p.m., turn on line 2 at 4:30 a.m., and turn off at 5:30 p.m.; morning)
Need to meet lighting requirements required for 5 consecutive rainy days. (5 days plus lighting the night before rainy days, totaling 6 days)
Battery = 5A × 7h × (5 + 1) days = 5A × 42h = 210AH
From more, in order to avoid the battery Overcharging and overdischarging, the battery istypically charged to about 90% and leaves about 20% when discharged.
So 210AH is only about 70% of the actual standard in applications. Three: Calculate the peak demand (WP) of the panel:
The cumulative lighting duration of the street light should be 7 hours (h) each night
★: The panel; receives effective light on average each day. The time is 4.5 hours (h).
At least 20% of the reservation for battery panels should be relaxed.
WP÷17.4V＝(5A×7h×120%)÷4.5h
WP÷17.4V＝9.33
WP＝ 162(W)