A brief discussion on solar power system configuration scheme
Release time：2018-3-5 20:47:56 Number of clicks：480
Recently, a lot of inquiries were sent from clients who wanted to install a solar system on the roof of their home, but they didn't know how to calculate and configure the package. Through the on-site measurement of our technicians and the active cooperation of local dealers, the following simple algorithms for computing solar power generation system are obtained:
1. Configuration algorithm of the controller.
The voltage of the controller is the same as the inverter voltage, which is the same as the output voltage level after the solar panel is connected, and then the current is calculated.
Current size is decided by the power of the solar panels, such as the four 200 w solar panels, no matter what method, total power is 800 w, in the case that the connection is 24 v output voltage grade, the current is 800/24 = 33 a, which is more than 33 a charge and discharge controller, we can choose 24 v / 40 a charge and discharge controller;
Emphasis: the size of the controller is determined by the solar panel; The power (voltage * current) of the charging and discharging controller is greater than or equal to the total power of all the generators;
2: algorithm of inverter.
The size of the inverter is determined by the load, which is determined by the back with the equipment, the equipment is divided into inductive load and resistance load and inductive load refers to the motor, fan, water pump, air conditioning and other open opportunity to move equipment, these devices boot will have 4 to 7 times the impact of the current (unless the frequency conversion start, there is no change of frequency conversion start), calculate the equipment, according to at least 4 times the power to calculate; Resistive load refers to those that have no or small impact current, such as electric light, computer, monitor, etc. The equipment is calculated according to the original power;
The selection of the inverter should be at least as large as the maximum power of the device at the back end. For example, with a 1KW water pump and a 1KW computer, the pump will have more than four times the impact. The computer won't, so the maximum power is 4+1=5KW, so the inverter should be at least 6KW.
3: the algorithm of battery.
The battery's choice also depends on the power size of the device in the rear and the length of the battery life.
Power is the sum of the power of all the devices in the rear, but do not count the impact, because the boot impact is only a short time and has little impact on the battery.
The formula is :(total power/dc voltage)* time = single battery capacity; Battery number = dc voltage/single node battery voltage.
For example, the load has a 1KW motor, a 1KW computer, and emergency power supply for 2 hours. The total power is 2000W. If the dc voltage is 24V, the single battery voltage is 12V.
Battery capacity =(2000/24)*2=166, which is to use 180AH/12V battery; Battery number =24V/12V=2;
So this case is going to be using 180AH/12V battery 2.
4. Configuration of solar panels:
Plan 1: solar panels charge the battery, which depends on the battery's capacity and voltage;
(for example, plan 1: the battery section of 100AH/12V is used; For five hours a day, the charging current of 20A is required,20A*12V=240W; Solar panels must be greater than or equal to 12V/240W solar panels.
Plan 2: the user hopes that when the solar energy is enough, the direct solar panel can be directly passed through the inverter, which requires the power of the solar panel to be greater than or equal to the load power; The dc voltage level ranges from the dc voltage level input to the inverter.
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