In any photovoltaic system, all the components must be related to each other; a large number of plates or a high-power inverter cannot be used for batteries that are too small, since if a relationship is not maintained in proportion, the useful life of the The batteries would be shortened, as would the efficiency of the installation. In this entry we will explain the details to take into account:

    The quantity of Solar Panels

    The number of solar panels that we will demand in the installation will be sized by the existing consumption in it; That is, if the installation is going to be used throughout the year, we should cover the average consumption of one day in winter, since it is the time of year in which we will have the least amount of solar hours.

    If the installation is going to be carried out in a home for occasional use, for summer or weekends, we must cover the consumption for an average day between September and October in relation to solar hours. To calculate the number of panels, the peak solar hours (HSP) of the location, the technical characteristics of the panels to be installed and the losses that may occur in the installation must be taken into account.

    Battery capacity for installation

    The energy stored in the batteries will not be enough for the installation if solar energy is not available. As we should not discharge them more than 30%, what we will do is multiply the daily consumption by 2, so that its capacity is doubled, with this we would have one day of autonomy, and we will multiply by the number of days of autonomy that wish to obtain the necessary capacity in batteries.

    Batteries are usually designed for 3-4 days of autonomy, although this depends on the location where the installation is carried out, which would make us multiply the daily capacity by the number of days to have the necessary autonomy.

    Do not confuse power with energy

    Power: It is the instantaneous demand of an electrical device, and the result of the working voltage multiplied by the absorbed current.

    Energy: Consumption of an electrical device per unit of time.

    Example: A 2W light bulb on for 1h will consume 2Wh of energy

    The power of the inverter limits the maximum power in electrical devices that we can have connected in our installation. As with the electricity company's electricity contract, if we exceed that power "the light will go off." In solar inverters what happens is that the inverter stops to protect itself.

    All solar inverters allow power peaks of a few seconds from their rated equipment power. This is used to start the most demanding loads such as motors or pumps.

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