How to choose the suitable solar photovoltaic controller?

Mainstream on the market of solar controller is divided into two main categories: 1, solar street lamps controller main features: commonly known as constant current source with constant current output power supply module within the rated to period of time to adjust the size of the output current is also we usually

the mainstream on the market of solar controller mainly divided into two categories: 1. Solar street lamps controller main features: constant current output power supply module, commonly known as constant current source, can be regulated within the rated output current at different times of the, this is what we usually call at different times in different power lighting. After 12 o 'clock in the evening, for example, the pedestrians on the road less and less. At this point, you can reduce the output current of the controller, to reduce the lighting power of the light source, extending battery life. This kind of controller is mainly used for street lamps with led light source. The scope of its choice based on the working voltage of lamp holder and battery voltage range. For example, in some cases, battery specification of 12 v100ah, lamp holder is 40 w, single lamp bead light emitting diode light source specification for 3. 0 ~ 3. 5 v, lamp bead for 10 series of four parallel connection way, the whole lamp holder of the scope of work is 30 ~ 35 v. Then select a booster constant current controller, to increase the voltage from 12 v to 30 ~ 35 v. Then we will choose the controller is depending on the type of battery connection lithium battery controller or lead-acid battery controller. After that, we will according to the power to determine the charging current of solar panels. Finally, we will through a combination of the above three elements to choose to suit our own controller scheme. 2. Off-grid solar controller according to the load of power and electricity first time to determine the power consumption of a day, and then according to the rainy day reserved quantity calculation of the total electricity consumption, according to the total power consumption to determine the total capacity of the battery, and then the reasonable allocation of storage battery to individual capacity, quantity, and connection, and then according to the load power consumption calculation of solar panels power, according to the power of solar panels and system voltage to determine the charging current to select the controller. Multiple protection function of photovoltaic array controller connected reverse polarity protection controller in pv arrays of polarity reversal from being damaged, and after the correct wiring controller will continue to work normally. When the battery reverse polarity connection, the battery polarity reverse connection protection controller from being damaged, and after the correct wiring, it will continue to work normally. Battery over-voltage protection when the battery voltage reaches over voltage disconnect point, the controller will automatically stop to recharge the battery, in order to prevent the damage due to excessive charging battery. Battery over discharge protection when the battery voltage to low voltage disconnect point, the controller will automatically stop the battery discharge, prevent damage of the battery due to over discharge. Battery overheat protection controller via an external temperature sensor detecting battery temperature. When the battery temperature exceeds 65 ℃, it will stop working, and return to work below 55 ℃. Load overload protection if the load current more than 1 rated current controller. 5 times, the controller will delay disconnect the load. Under the condition of overload, in the automatic recovery of the controller output is invalid after five times, must through the press SET key or restart the controller or a decrease in load side of electrical equipment for day and night change ( Night time > 3 hours) To eliminate the protection action.