The main technical parameters of the photovoltaic controller are as follows.
1. system voltage
System voltage, also called rated operating voltage, refers to the DC working voltage of the photovoltaic power generation system, the voltage is generally 12v and 24v, medium and high power controllers also have 48v, 110v, 220v, etc.
2. Maximum charging current
Maximum charge current refers to the maximum current output of solar cell elements or arrays, according to the power size is divided into 5a 6a 8a 10a 12a 15a 20a 30a 40a 50a 70a 100a 150a 200a 250a 300a and other specifications. Some manufacturers use the maximum power of solar cell components to indicate this content, indirectly reflecting the maximum charging current this technical parameter.
3. solar cell square input road number
Small power photovoltaic controller is generally a single input, and high-power photovoltaic controller are multiple input from the solar cell array, general high-power photovoltaic controller can input 6, the most can access 12, 18
4. Circuit loss
Controller circuit loss is also one of its main technical parameters, also known as no-load loss (quiescent current) or the maximum self-consumption current. In order to reduce the loss of the controller and improve the conversion efficiency of photovoltaic power supply, the circuit loss of the controller itself should be as low as possible. The controller’s maximum self-loss shall not exceed 1% of its rated charging current or 0.4w. Depending on the circuit, its own loss is generally 5~20ma.
5. battery overcharge protection voltage (hvd)
Battery overcharge protection voltage is also called full disconnect or overvoltage shutdown voltage, generally can be set between 14.1~14.5v (12v system), 28.2~29v (24v system) and 56.4~58v (48v system), typical values are 14.4v, 28.8v and 57.6v respectively. battery charge protection shutdown The recovery voltage (hvr) is generally set between 13.1~13.4v (12v system), 26.2~26.8v (24v system) and 52.4~53.6v (48v system) with typical values of 13.2v, 26.4v and 52.8v respectively. 6.
6. battery over-discharge protection voltage (lvd)
The battery over discharge protection voltage, also called under voltage disconnect or under voltage shutdown voltage, can generally be set between 10.8~11.4v (12v system), 21.6~22.8v (24v system) and 43.2~45.6v (48v system), typical values are 11.1v, 22.2v and 44.4v respectively, depending on the need and battery type. The shutdown recovery voltage (lvr) of battery over discharge protection is generally set between 12.1~12.6v (12v system), 24.2~25.2v (24v system) and 48.4~50.4v (48v system), with typical values of 12.4v, 24.8v and 49.6v respectively. 7.
7. battery charging float voltage
The battery charge float voltage is typically 13.7v (12v system), 27.4v (24v system), and 54.8 (48v system).
8. Temperature compensation
The controller generally has temperature compensation function to adapt to different ambient working temperature and set more reasonable charging voltage for the battery, the temperature compensation coefficient of the controller should meet the technical development requirements of the battery, and its temperature compensation value is generally -20~-40mv/oc.
9. Working environment temperature
The use or working environment temperature range of the controller varies with the manufacturer generally between -20~+50 oc.
10. Other protection functions
(1) Controller input and output short circuit protection function. Controller input and output circuits should have a short-circuit protection circuit to provide wave protection function
(2) anti-reverse charge protection function. The controller should have the protection function to prevent the battery from charging the solar cell in reverse.
(3) polarity reversal protection function. Solar cell components or battery access to the controller, when the polarity is reversed, the controller should have the function of protection circuit.
(4) lightning protection function. Controller input with protection against lightning strikes, the type and rating of the lightning arrester should ensure the absorption of the expected impact energy.
(5) inrush voltage resistance and inrush current protection. Apply 1.25 times the nominal voltage to the solar cell input of the controller for one hour, the controller should not be damaged. The controller charging circuit current up to 1.25 times the nominal current and continue for one hour, the controller should not be damaged.