Select Solar Controller
Author: Source: Datetime: 2016-09-11 20:15:58
Some customers often found in solar street light for some time, especially after consecutive days of rain, street lights will be several days or even many days without light, to detect the battery voltage is also normal, controller, lights are not faulty.
This question has been so many engineering companies doubts, in fact, this problem is "Exit undervoltage protection," the voltage value, the higher the set value, the recovery time after undervoltage longer, thus causing a lot of days can not light light.
On this issue, the industrial version of the controller can be set so that each customer exit protection voltage value according to the configuration. But it is worth noting that the panel configuration must be reasonable, if the solar panels charge per day can not meet the night of the amount of discharge, over time, often in deep discharge liefePo4 battery life is shortened, so the liefePo4 battery plate configuration must be enlarged margin , the greater the configuration panels, you can exit the protection voltage set by the lower, this will not affect the battery.
Two: LED lamp constant current output
LED because of its own characteristics, it must be constant or limiting through technical means, or does not use. LED lights are common through additional drive power to achieve a constant current to the LED lights, but the driver has accounted for about 10% -20% of the total power of the lamp, such as a theoretical value 42W LED lamp, plus after driving the actual power may be about 46-50W. When calculating the power of solar panels and liefePo4 batteries capacity, it must pay 10% -20% to meet the power consumption caused by driving. In addition, the driver will be more and more a part of the fault generated. Industrial version controller software without constant power, high stability, reducing overall power consumption.
Three: output period
Common controller settings generally only four hours or eight hours after the lights and other closed several hours, has been unable to meet the needs of many customers. Industrial version controller can be divided into three periods, each time period can be set, depending on the environment of use, each period can be set to off. For example, some plant or scenic night no one can put a second period (late at night) off, or the second and third periods are closed, reduce the cost.
Four: LED light output power adjustment
In the application of solar energy lamps which, LED lamps are most suitable to achieve the output pulse width modulated by a different power. Restrict or limit the pulse current at the same time, the entire output of the duty cycle of the LED lamp can be adjusted, for example, a single 1W LED 7 and 5 string together 35W LED lamp discharge at night, early morning and late at night may be periods respectively power regulation, such as the late adjusted to 15W, the morning adjusted to 25W, and the lock current, so that is to meet the night lighting, but also saves battery plates, battery configuration costs. The long-term test proved that the pulse width adjustment mode LED lights, the whole lamp heat generated is much smaller, to extend LED life.
Some lamp factory in order to achieve the purpose of saving the night, the interior LED lights made of 2-way power, closed at night all the way to achieve power output power is halved, but the practice has proved that this method will result in the first half of the light source failure, or the way the light source brightness inconsistencies early damage.
Five: line loss compensation
Line loss compensation current conventional controller hard to do, because of the need to set the software, depending on the diameter and length of the line to give automatic compensation. LDC in the low pressure system is actually very important, because the voltage is low, line loss is relatively large, if there is no corresponding voltage line loss voltage compensation, may be lower than the output of the input of many, this will cause the liefePo4 battery in advance undervoltage protection, the application rate of the liefePo4 battery pack capacity is compromised. It is noteworthy that, when we use low-pressure system, in order to reduce the line loss voltage drop, try not to use too thin cable, cable is also not too long.
Many controllers in order to reduce costs, without considering the heat dissipation problem, so a larger load current or charging current is large, the heat increased, the controller field pipe resistance is increased, leading to a substantial decline in the charging efficiency, field pipe overheating after service life greatly reduced or even destroyed, especially in summer outdoor ambient temperature is high, so good cooling device controller should be essential.
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