How to choose the right Solar PV system?

The design of a Solar PV system means a very broad concept that it would cover all tasks and specifications that have to be performed and taken into account to that a photovoltaic system works satisfactorily, with the greatest reliability and at the lowest possible cost. In this sense, there will be a great multitude of factors that will affect this design such as the consumption profile of the loads that are going to Sizing of Solar PV systems feed the photovoltaic system and the solar radiation of the place where the Installation, mainly.

The dimensioning concept would be a less broad concept and would be included among the design tasks Sizing of a photovoltaic system means the calculation of optimal installation size. The fundamental task of sizing a system Solar PV with the structure will consist mainly of the determination of the optimum size of both the photovoltaic generator and the battery or set of batteries that form the system. Since these two elements are the most important of the Solar PV system should pay special attention to its size. At a later stage, and without diminishing importance, it will be necessary to dimension also the other elements that also participate in the installation such as the inverter, the charge regulator and wiring.

The demand for energy imposes many of the characteristics of the installation, so in the planning of needs, everything related to the difference must be noted electrical appliances that will be the system charge. The energy that the user will need daily must be calculated. To do this you must determine the power of all the devices that will be included in the installation, individually, along with the average time of use of each of them. In case of doubt, both the power as the average time of use should be rounded up.

Sizing of Solar Battery

To define the size of the solar battery storage Mackay, the following must be taken into account parameters:

  • Maximum Depth of Discharge: is the maximum discharge level that is allowed to the battery before disconnecting the regulator, to protect the duration of the regulator. In stationary lead-acid batteries, an adequate value of this parameter is 0.7
  • Days of Autonomy: is the number of consecutive days that in the absence of sun, the system accumulation is able to meet the consumption, without exceeding the maximum depth of battery discharge. The possible days of autonomy, depending among other factors of the type of installation and climatic conditions of the place.

Sizing of Solar Inverter

The operating characteristics that define a DC – AC inverter or converter are:

  • Nominal Power (kW)
  • Nominal Input Voltage (V)
  • Nominal Output Voltage (V)
  • Operating frequency (HZ)
  • Performance (%)

The input voltage at the solar inverters in Cairns of a photovoltaic installation will not always be constant, so the inverter must be able to transform different continuous voltages within a certain range. That range is usually 15%.

The nominal voltage value is a reference data within the operating range which serves to identify the type of converter.

When sizing the inverter, the power required by the load will be taken into account AC, so that an inverter whose nominal power is somewhat higher than the maximum will be chosen Sizing of Solar PV systems demanded by the load. However, inverter oversizing should be avoided to try to make it work in the area where it has better efficiencies.

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