subject: On the practical application of solar lights and accessories selection - Full Electric Stacker [print this page] On the practical application of solar lights and accessories selection - Full Electric Stacker
1: now restrict the application of solar power is one of the most important part of the price of solar energy to a two-way street, for example, two-way load of 60 watts total, (middle and lower reaches of Yangtze effective light 4.5h / day, night Discharge 7 hours, 20% increase in battery plate aside amount) of its solar panels will need about 160W, 30 yuan per watt basis, the solar panels would cost 4,800 yuan, plus the cost of batteries 180AH are about 1800 about the whole street into a one-time cost is much higher than the circuit city lights, solar street light applications created a major bottleneck.
Two: the battery life should consider the entire street system applications, the average battery warranty for three years or five years, but generally the battery in a year or even six months later there will be charge dissatisfaction, some of the actual charge rate may drop to 50%, this is bound to affect the continuous rainy days during the normal night-time lighting, so select a good battery is particularly important.
3: Some Contractors are often used as a solar LED street lamp lighting, but the layer of poor quality LED lights missing, LED light serious decline six months is likely to decay 50% of the illumination. So be sure to select the LED lights light decay slowly, or use electrodeless lamp, low pressure sodium lamp and so on.
4: the choice of the controller is also often overlooked is a problem in engineering business, the controller layer of poor quality and missing, 12V/10A controller market price of 100-200 per month, although the value of the entire streetlight system, the smallest some, but it is a very important link. Controller will have a direct impact on solar street lamp system component life and overall system cost of procurement,
A: You should choose a low-power controller, the controller 24 hours of work, as they own large power consumption, it will consume some power, the best choice for power in one milliampere (MA) under control.
2: To select high efficiency charge controller with MCT charge mode controller to automatically track the maximum current of solar panels, especially in the winter or periods of insufficient light, MCT charging mode about 20% higher than the efficiency.
3: should be selected with two-way power adjustment controller, the controller has a power adjustment has been widely promoted, few pedestrians at night time can be automatically shut down all the way or two-way lighting, saving electricity, you can adjust for power LED lamps . In addition to the above selected power-saving features, should also pay attention to the controller on the battery and other components of protection, as a trickle charge mode of the controller can well protect the battery, increasing battery life, while setting the controller voltage protection value, as the undervoltage protection value adjustments in 11.1V, to prevent excessive battery discharge.
5: a place far away from the city should also pay attention to security work, a lot of business because of the construction project oversight, there is no effective anti-theft, resulting in batteries, solar panels and other components were stolen, not only affect the normal lighting, but also caused unnecessary damage to property. Present the case of stolen works mostly for the batteries, battery buried pouring cement is an effective anti-theft measures in the battery box to install poles to the best welding reinforcement.
6: Controller's waterproof, the controller usually installed in the lamp, battery box, generally not water, but in the case of the actual project controller port connection cable is often because the water flows down the cable caused by short circuit controller. Therefore, the construction should pay attention to the internal wiring of bent "U" shaped and solid type, the external connection line can also be fixed for the "U" type, so that rainwater can not Linru short circuit caused by the controller, while also including the outside Apply waterproof glue interfaces.
7: Among the many practical applications of solar lights, solar lights in many places can not meet the normal lighting needs, especially in the rainy days more prominent, in addition to using low-quality-related components, the other main reason is persistently lower group parts cost, not the design configuration according to demand, reduce the use of solar panels and batteries standard, thus resulting in the rainy day can not provide street lighting. The following provides solar panels and battery configuration formula:
1: First calculate the current:
Eg: 12V battery system;
30W lamp 2, a total of 60 watts.
Current = 60W 12V
= 5A
2: Calculate the battery capacity needs:
Such as: street light night time lighting the need for total 7 hours at full load (h);
(Eg 8:00 pm to open, close a road 11:30 at night, open 4:30 am 2 Road, close 5:30 am)
Need to meet the continuous overcast and rainy days 5 days lighting needs. (5 days plus a rainy day lighting the night before, namely, 6 days)
Battery = 5A 7h (5 +1) days
= 5A 42h
= 210AH
In addition to prevent overcharging and deep discharge battery, battery charging to 90% of normal; discharge the remaining 20%. So 210AH only real application of the standard 70%.
3: calculated peak demand for the battery plate (WP):
Total night time street lighting needs to 7 hours (h);
: Average daily solar panel to accept an effective illumination time was 4.5 hours (h);
Relaxation of solar panels at least 20% of the reserved amount of demand.
WP 17.4V = (5A 7h 120%) 4.5h
WP 17.4V = 9.33
WP = 162 (W)
: 4.5h daily illumination time for the areas near the Yangtze River sunshine factor.
Another component in the solar street light, line loss, the loss of control, and ballast or current source of power vary, the application may be about 5% -25%. So 162W is only theoretical value, based on the actual situation requires increased.
