For existing buildings with PV production exceeding the demandĬonnecting the PV system upstream from the main low-voltage switchboard is frequently the approach taken in existing buildings when the PV production being added is greater than the building’s consumption. Limited upgradability, because an increase in the PV system production capacity or the addition of other local production or storage may require significant changes such as resizing the existing electrical infrastructureģ.Complexity of the design, management, and maintenance of the installation, especially if there are several dispersed PV-sources. However, this architecture presents important limitations including Connecting the photovoltaic system to a secondary LV switchboard nearby can minimize cable length and facilitate integration of the photovoltaic system. Indeed, in such situations, the cable length between the PV system and the main LV Switchboard can be considerable. This approach is used primarily in existing multi-floor buildings, where the PV production, usually on the roof, is far from the main LV switchboard, which is usually at ground level. For existing buildings with small-scale PV productionĬonnecting PV generators to the closest secondary low-voltage switchboard is an architecture used mainly in existing buildings where the PV production is much lower than the building consumption. It is recommended for both new and existing buildings. This architecture is simple and safe to maintain because the photovoltaic production can be disconnected at a single point. If the conversion of the power produced by the solar panels is done by more than one photovoltaic inverter, it is recommended that the output of those inverters be grouped by connecting them to a secondary LV switchboard, which is then connected to the main LV switchboard at a single point. One option is to connect the photovoltaic system to the main low-voltage switchboard of the electrical installation. Recommended design: connect to the main LV switchboard Main options for connecting photovoltaic system to an electrical installation: (1) to the main LV Switchboard (2) to a secondary LV Switchboard and (3) upstream from the main LV switchboard 1.
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