How to select the solar power system equipment

- Jan 14, 2019-

For the selection of solar panel auxiliary equipment, the details are as follows


1. How to configure the battery for solar panels


According to the solar panel optimization design results, determine the voltage and capacity of the battery, select the appropriate battery type and model, specifications, and then determine the number and connection method.


In general, lead-acid batteries can be used. In the case of harsh working conditions, colloidal batteries are sometimes used. For systems that supply important loads, nickel-cadmium batteries or nickel-hydrogen batteries can be used.


2. How to configure the controller for solar panels


According to the requirements of the load and the importance of the system, determine the sufficient and necessary functions of the PV system controller, and configure the corresponding controller.


The controller function is not as good as possible, otherwise it not only increases the cost, but also increases the possibility of failure.


3. Inverter


For AC loads, the corresponding inverter must be equipped. Currently, controllers and inverters are usually made into a body. In some cases, some networked systems can supply power to the load when the amount of photovoltaic power is insufficient, but it is not allowed to send power to the grid when there is excess in photovoltaic power generation. At this time, the controller and the inverter must have a backflow prevention function to prevent reverse power transmission, so as to ensure that photovoltaic power cannot be input to the power grid.


When selecting an inverter for an off-grid PV system, consider the following characteristics: output waveform, power conversion efficiency, rated power, rated load, input voltage, output voltage, voltage monitoring, voltage regulation, voltage protection, frequency, and modularity, power factor, standby current, size and quality, audio and RF noise conditions, meters and switches.


In some cases, the inverter is also required to add the following functions: battery charging, remote control operation with load transfer switch, parallel operation.