Different size of PV modules will produce different amount of power. To find out the sizing of PV module, the total peak watt produced needs. The peak watt Wp produced depends on size of the PV module and climate of site location. For Thailand, the panel generation factor is 3. To determine the sizing of PV modules, calculate as follows:. An inverter is used in the system where AC power output is needed. The input rating of the inverter should never be lower than the total watt of appliances.
The inverter must have the same nominal voltage as your battery. For stand-alone systems, the inverter must be large enough to handle the total amount of Watts you will be using at one time. In case of appliance type is motor or compressor then inverter size should be minimum 3 times the capacity of those appliances and must be added to the inverter capacity to handle surge current during starting.
For grid tie systems or grid connected systems, the input rating of the inverter should be same as PV array rating to allow for safe and efficient operation. The battery type recommended for using in solar PV system is deep cycle battery. Deep cycle battery is specifically designed for to be discharged to low energy level and rapid recharged or cycle charged and discharged day after day for years.
The battery should be large enough to store sufficient energy to operate the appliances at night and cloudy days. To find out the size of battery, calculate as follows:. The solar charge controller is typically rated against Amperage and Voltage capacities. Select the solar charge controller to match the voltage of PV array and batteries and then identify which type of solar charge controller is right for your application.
Make sure that solar charge controller has enough capacity to handle the current from PV array. For the series charge controller type, the sizing of controller depends on the total PV input current which is delivered to the controller and also depends on PV panel configuration series or parallel configuration. The inverter must have the same nominal voltage as your battery. In case of appliance type is motor or compressor then inverter size should be minimum 3 times the capacity of those appliances and must be added to the inverter capacity to handle surge current during starting.
For grid tie systems or grid connected systems, the input rating of the inverter should be same as PV array rating to allow for safe and efficient operation.
Battery sizing The battery type recommended for using in solar PV system is deep cycle battery. Deep cycle battery is specifically designed for to be discharged to low energy level and rapid recharged or cycle charged and discharged day after day for years.
The battery should be large enough to store sufficient energy to operate the appliances at night and cloudy days. To find out the size of battery, calculate as follows: 4. Solar charge controller sizing The solar charge controller is typically rated against Amperage and Voltage capacities.
Select the solar charge controller to match the voltage of PV array and batteries and then identify which type of solar charge controller is right for your application. Make sure that solar charge controller has enough capacity to handle the current from PV array. For the series charge controller type, the sizing of controller depends on the total PV input current which is delivered to the controller and also depends on PV panel configuration series or parallel configuration.
According to standard practice, the sizing of solar charge controller is to take the short circuit current Isc of the PV array, and multiply it by 1. One 60 Watt fan used for 2 hours per day. One 75 Watt refrigerator that runs 24 hours per day with compressor run 12 hours and off 12 hours.
Whether you use pencil and paper or a computer, these exercises provide a sense of what system size will work for you. A consultant or installer can provide a more detailed analysis and can advise on what will work best for your particular needs. Are you interested in solar electricity because you want to reduce your environmental footprint?
To determine the amount of greenhouse gases you are not emitting into the atmosphere by installing a solar electric system, use Option 1 insert the kWh provided by the solar electric system with the U. McCabe, J. All About Photovoltaic Systems.
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