How to read the parameters of solar charge controller?

1.System voltage

The system voltage is also called the rated operating voltage, which refers to the DC operating voltage of photovoltaic power generation systems. The voltage is generally 12v and 24v. The middle and high power controllers also have 48v, 110v, 220v, etc.

2.Maximum charging current

The maximum charging current refers to the maximum current output by a solar cell element or a square array, which 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 represent this content, which indirectly reflects the technical parameter of maximum charging current.

3. Number of input channels of solar cell square array

Low-power photovoltaic controllers are generally single-input, while high-power photovoltaic controllers are multi-input from solar cell square arrays. Generally, high-power photovoltaic controllers can input 6 channels, and a maximum of 12 and 18 channels can be connected.

4. Circuit self-loss

The controller circuit‘s own loss is also one of its main technical parameters, also called no-load loss (static 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 loss of the controller‘s circuit itself should be as low as possible. The maximum self-loss of the controller must not exceed 1% or 0.4w of its rated charging current. According to the circuit, its own loss is generally 5 ~ 20ma.

5. Battery overcharge protection voltage (hvd)

The battery overcharge protection voltage is also called full disconnect or overvoltage shutdown voltage. Generally, it can be set to 14.1 ~ 14.5v (12v system), 28.2 ~ 29v (24v system), and 56.4 ~ 58v according to different needs and battery types. (48v system), the typical values ​​are 14.4v, 28.8v, and 57.6v. The shutdown recovery voltage (hvr) of the battery charging protection is generally set to be between 13.1 ~ 13.4v (12v system), 26.2 ~ 26.8v (24v system) and 52.4 ~ 53.6v (48v system), with typical values ​​of 13.2 respectively. v, 26.4v, and 52.8v.

6. Overdischarge protection voltage of storage battery (lvd)

The over-discharge protection voltage of the battery is also called under-voltage disconnection or under-voltage shutdown voltage. Generally, it can be set to 10.8 ~ 11.4v (12v system), 21.6 ~ 22.8v (24v system) and Between 43.2. ~ 45.6v (48v system), the typical values ​​are 11.1v, 22.2v and 44.4v. The shutdown recovery voltage (lvr) of the 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). Typical values ​​are 12.4v, 24.8v, and 49.6v.