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Is A Solar Charge Controller Necessary?

Views:77     Author:Site Editor     Publish Time: 2020-02-11      Origin:Site


The solar controller is called the solar charge and discharge controller. It is used in the solar power system to control the multi-channel solar cell array to charge the battery to supply power to the solar inverter load.



Installation Precautions of Solar Power Systems Controller


1) Unpack the solar power controller and fix it in a suitable position (please avoid direct sunlight and moisture).


2) Connect the battery lead first (in order to make the automatic identification function not to make errors), and wait for the controller to complete the identification process (the level indicator indicates the battery power) and then connect the solar panel lead, finally connect the load line when the load is turned off. 


3) In order to use safety, do not make excessive load or increase the solar panel too much. Replace the solar battery with a power source such as a power supply to charge the battery.


4) When charging, remove the solar panel and the charging current should not be too large.


5) Pay attention to the positive and negative terminals of the battery.



Common Troubleshooting of Solar Power Systems Controller


1) The load does not work


① During the day, whether the controller has light control.

② The battery is low.

③ Whether wiring is correct.

④ Remove all the wires and repeat the above installation process for the controller to recognition.



2) It can be used in the first few days and does not work in a few days.

① The solar battery wiring is incorrect.

② The solar battery is not connected.



3) It Can't be in light control.

① The solar battery wiring is incorrect.

② This function is not set, please reset it.



4) Work when it is turned on, it can not be in light control or time control.

① This function is not set, please reset it.

② The ambient light of the solar panel is strong enough.



5) Work instructions flash with nonstop

The load has a short circuit or the load is too large.



Protection Mode of Solar Power Systems Controller

1) Direct charge protection point voltage: Direct charge is also called rapid charge. It belongs to fast charge. Generally, the battery is charged with high current and relatively high voltage when the battery voltage is low. However, there is a control point, which is also called protection. When the battery terminal voltage is higher than these protection values during charging, the direct charge should be stopped. The direct charge protection point voltage is also the "overcharge protection point" voltage. When charging, the battery terminal voltage cannot be higher than this protection point, otherwise it will cause overcharge and damage to the battery.


2) Equalization control point voltage: After the direct charge is completed, the battery will be statically set by the charge and discharge controller for a period of time, so that its voltage will fall naturally. When it falls to the “recovery voltage” value, it will enter the equalization state. Why design such a charge? That is, after the direct charge is completed, there may be some batteries that are “backward” (the terminal voltage is relatively low). In order to pull these individual molecules back and make all the battery terminal voltages have uniform consistency, it is necessary to match the high voltage with moderate voltage. The current is recharged for a short while, so the so-called equalization, that is, "balanced charging" can be seen. The charging time should not be too long, usually from a few minutes to ten minutes. If the time setting is too long and it is harmful. For a small system with a two-cell battery, it doesn't make much sense. Therefore, the street light controller generally does not have an equal charge, only two stages.


3) Float control point voltage: Generally, after the equalization is completed, the battery is also allowed to stand for a period of time, so that its terminal voltage naturally falls. When it falls to the “maintenance voltage” point, it enters the floating state, when the battery voltage is at a low level, it will be charged a little, so as to avoid the battery temperature continuously rising, which is very beneficial for the battery. Because the internal temperature of the battery has a great influence on the charge and discharge. In fact, the PWM method is mainly designed to stabilize the battery terminal voltage, and the battery charging current is reduced by adjusting the pulse width. This is a very scientific charging management system. Specifically, at the end of charging, when the remaining capacity (SOC) of the battery is >80%, it is necessary to reduce the charging current to prevent excessive outgassing (oxygen, hydrogen, and acid gas) due to overcharging.


4) Over-discharge protection termination voltage: Battery discharge can not be lower than this value, which is the national standard. Although the battery manufacturers also have their own protection parameters, but ultimately they must move closer to the national standard. It should be noted that, for safety reasons, the 12V battery over-discharge protection point voltage is artificially added plus 0.3v as the zero-drift correction of the temperature compensation or control circuit, so that the over-discharge protection point voltage of the 12V battery is: 11.10v, then the over-discharge protection point voltage of the 24V system is 22.20V.



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