 |
Photovoltaic charge controllers can basically be divided into five types: parallel photovoltaic controllers, series photovoltaic controllers, pulse width modulation photovoltaic controllers, intelligent photovoltaic controllers, and maximum power tracking photovoltaic controllers.
1. Parallel type photovoltaic controller. When the battery is full, the output of the photovoltaic array is diverted to the internal shunt resistor or power module using electronic components and then consumed as heat. Parallel-type photovoltaic controllers are generally used in small, low-power systems, such as voltages of 12V, 20A, and systems. This type of controller is very reliable and does not have mechanical parts such as relays.
2. Tandem photovoltaic controller. The use of mechanical relays controls the charging process and shuts off the photovoltaic array at night. It is generally used in higher power systems. The capacity of the relay determines the power level of the charge controller. It is easier to make a series-connected photovoltaic controller with a continuous current of 45A or more.
3, pulse width modulation type photovoltaic controller. It switches the input of the PV array in PWM pulses. When the battery tends to be full, the pulse frequency and time are shortened. According to the research of Sandia National Laboratories of the United States, this kind of charging process forms a relatively complete state of charge, which can increase the total cycle life of the storage battery in the photovoltaic system.
4, intelligent photovoltaic controller. Based on MCUs (such as Intel's MCS51 series or Microchip's PIC series), high-speed real-time acquisition of the operating parameters of the photovoltaic power system, and according to a certain control law by the software program to separate and connect single or multiple PV arrays control. For medium and large photovoltaic power systems, distance control can also be performed through the MCU's RS232 interface with a MODEM modem.
5, the maximum power tracking controller. The solar battery voltage V and current I are detected and multiplied to obtain power P. Then, it is determined whether the output power of the solar battery reaches the maximum at this time. If not, the pulse width is just adjusted, the output duty ratio D is modulated, and the charging is changed. The current is sampled again in real time and a judgment is made as to whether or not to change the duty ratio. Through this optimization process, the solar cell can always be operated at the maximum power point to fully utilize the output energy of the solar cell array. At the same time, the PWN modulation method is used to make the charging current a pulse current to reduce the polarization of the battery and improve the charging efficiency.
Sliding pocket doors are a great way to conserve space as well as recover space lost to swinging doors. They can also be used to add a door when swing clearance is limited. The pocket frame kit includes solid wood studs encased in extruded aluminum to reduce corrosion and minimize any bowing effect.
Features
Allows sliding doors to be completely concealed within walls
Requires less than 5 lbs of horizontal force to open
Space saving sturdy design
Knock down construction
Extruded aluminum studs with solid wood core
Includes chrome plated steel hangers
Material: Wood & steel
Sizes: 80 inches,84 inches,96 inches
Usage: Pocket door system.
Color: Wood & Zinc plated
Pocket Door Hardware,Pocket Door Kit,Pocket Door Frame Kit,Pocket Door Hardware Kit,Pocket Door Parts
Foshan Nanhai Xin Jianwei Hardware Factory , https://www.aag-hardware.com