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solar controller
The Parameters of Solar Controller 2017-12-15 11:38:57

1. System voltage

System voltage, also known as the rated operating voltage, refers to the photovoltaic power generation system DC voltage, the voltage is generally 12v and 24v, the high-power controller also has 48v, 110v, 220v, etc.


2. Maximum charge current

The maximum charging current is the maximum current outputted by the solar cell element or the square array, and is divided into a variety of specifications according to the power size: 5a 6a 8a 10a 12a 15a 20a 30a 40a 50a 70a 100a 150a 200a 250a 300a. Some manufacturers use the maximum power of solar cells to represent this content, indirectly, the maximum charge current reflects the technical parameters.


3. Number of solar cell array input

Low-power photovoltaic controllers are generally single input, and high-power photovoltaic controller are made by the solar cell array multi-channel input, the general high-power photovoltaic controller can enter 6, the maximum can access 12 Road, 18 Road


4. circuit itself loss

The controller's own circuit loss is also one of its main technical parameters, also known as no-load loss (quiescent current) or maximum self-consumption current. In order to reduce the loss of the controller and improve the conversion efficiency of the photovoltaic power supply, the controller's own circuit loss should be as low as possible. The maximum self-loss of the controller shall not exceed 1% or 0.4w of its rated charge current. According to the circuit of their own loss is generally 5 ~ 20ma.


5. Battery overcharge protection voltage (hvd)

Battery overcharge protection voltage is also called full or disconnected or overvoltage shutdown voltage, generally according to the needs and battery type, set to 14.1 ~ 14.5v (12v system), 28.2 ~ 29v (24v system) and 56.4 ~ 58v (48v system), the typical values were 14.4v, 28.8v and 57.6v. The shutdown recovery voltage (hvr) of the battery charge protection is typically set at 13.2 to 13.4v (12v system), 26.2 to 26.8v (24v system) and 52.4 to 53.6v (48v system), typically 13.2 v, 26.4v and 52.8v.


6. Battery over discharge protection voltage (lvd)

Battery over-discharge protection voltage is also called undervoltage or undervoltage shutdown voltage, generally according to the needs and battery type, set at 10.8 ~ 11.4v (12v system), 21.6 ~ 22.8v (24v system) and 43.2. ~ 45.6v (48v system), the typical values were 11.1v, 22.2v and 44.4v. The shutdown recovery voltage (lvr) of the battery overdischarge protection is generally set between 12.1 ~ 12.6v (12v system), 24.2 ~ 25.2v (24v system) and 48.4 ~ 50.4v (48v system), the typical values are 12.4v, 24.8v and 49.6v.


7. Battery charging float voltage

Battery charging float voltage is generally 13.7v (12v system), 27.4v (24v system), and 54.8 (48v system).


8. Temperature compensation

The controller generally has a temperature compensation function to meet the different environmental operating temperature for the battery to set a more reasonable charging voltage, the controller temperature compensation factor should meet the battery technology development requirements, the temperature compensation value is generally -20 ~ -40mv / oc.


9.Working ambient temperature

The use of the controller or working environment temperature range with the manufacturers in general between -20 ~ +50 ℃.


10. Other protection functions

(1) controller input and output short circuit protection function. Controller input and output circuits must have a short circuit protection circuit to provide wave protection

(2) anti-charge protection function. The controller should have the protection function to prevent the battery to reverse charge to the solar cell.

(3) polarity reverse polarity protection function. Solar cell components or battery access controller, when the polarity is reversed, the controller should have the function of the protection circuit.

(4) anti-lightning protection function. The controller input has a lightning protection function, and the type and rating of the arrester should ensure that the expected impact energy is absorbed.

(5) impact resistance and impact current protection. The controller should not be damaged by applying 1.25 times the nominal voltage to the solar cell input of the controller for one hour. The controller charging circuit current reaches 1.25 times the nominal current for one hour and the controller should not be damaged.

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