How to configure a solar power system

This method is mainly suitable for off-grid users
1: The configuration algorithm of the controller
The voltage of the controller should be the same as the voltage of the inverter, and the output voltage level after connecting with the solar panel should be the same, and then the current will be counted;
The size of the current is determined by the power of the solar panels, such as four 200W solar panels, no matter how they are connected, the total power is 800W. Assuming that the output voltage level after connection is 24V, the current is 800/24=33A. If the charge and discharge controller is larger than 33A, we can choose the charge and discharge controller of 24V/40A;
It is emphasized that the size of the controller is determined by the solar power generation panel; that is, the power (voltage * current) of the charge and discharge controller should be greater than or equal to the total power of all power generation panels;
2: Algorithm of the inverter
The size of the inverter is determined by the load, which is determined by the equipment behind it, but the equipment is divided into inductive load and resistive load. The inductive load refers to the motor, fan, water pump, air conditioner, etc. Equipment, these devices will have 4 to 7 times the inrush current when they are turned on (except for variable frequency startup, which has no effect). When calculating these devices, at least 4 times the power should be calculated. When there is no or very small inrush current, such as lamps, computers, monitors, etc.; these devices can be calculated according to the original power;
The choice of the inverter should be at least larger than the maximum power after the amplification of the equipment carried at the back end; for example, with a 1KW water pump and a 1KW computer, the water pump will have more than 4 times the impact, the computer will not, Then the maximum power must be 4+1=5KW, so the inverter must be at least 6KW or more;
3: Battery Algorithm
The choice of battery also depends on the power of the device behind it and the length of time it needs to be powered by the battery;
The power is the sum of the power of all the devices in the back, but don't count the shock, because the power-on shock is only for a short time and has little effect on the battery;
The formula is: (total power/DC voltage) * time = capacity of a single battery; number of battery cells = DC voltage / single battery voltage;
For example: the load has a 1KW motor and a 1KW computer, and it needs emergency power supply for 2 hours, the total power is 2000W, if the DC voltage is 24V, the single-cell battery voltage is 12V;
Battery capacity=(2000/24)*2=166, that is to say, 180AH/12V batteries are used; the number of battery cells=24V/12V=2 cells; so this case needs to use 180AH/12V batteries 2 cells;
4: Configuration of solar panels:
Option 1: The solar panel only charges the battery, which depends on the capacity and voltage of the battery;
(Example 1: A 100AH/12V battery is used; according to 5 hours of full sun a day, a charging current of 20A is required, 20A*12V=240W; that is, the solar panel must be greater than or equal to 12V /240W solar panel ;)
Option 2: The user hopes that when the solar energy is sufficient, the solar panel can be output directly through the inverter, then the power of the solar panel must be greater than or equal to the load power; the DC voltage level range is different from the DC voltage level input by the inverter. place.