The type labels are on the right-hand side of the enclosure. The type labels must be permanently affixed to the DC Disconnect. Symbols on the type labels Actuating the DC Disconnect interrupts the flow of current and the DC cabling can be safely disconnected from the inverter. Page Communication The inverter can be fitted with a Piggy-Back to enable cable-based communication with special data capture devices or a PC with the relevant software for information about supported communication products for communication via Piggy-Back, see www.

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Basic concepts about a PV inverter? Solar Inverter Performance: The efficiency of any photovoltaic inverter is affected not only by the losses produced by switching but also by losses due to passive elements, such as transformers, filters, capacitors, etc. In general the efficiency of an pv inverter is higher in those with low void losses, and the efficiency increases if the DC input voltage of the solar panels grows. Fundamental requirements: The flow of electric energy normally always goes in the direction of charges, when a power outage occurs, the inverter has to stop and stop injecting into the power grid.

The inverter must meet the required specifications of the electrical network. The safety of operators must always be taken into account there may be unknown active parts. Photovoltaic installations should not deliver power to a power line without protections. Disconnection of the inverter must be automatic as soon as a fault appears.

There must be an easy disconnect point border switch that is accessible to employees of the power company at any time. The inverters must operate with a power factor equal to one.

Electrical isolation between the photovoltaic system and the grid must be carried out. The new connection will be enabled after a certain time 3 minutes normally , time that the control system and network protection waits to try a new connection.

The harmonic content in the output signal of an inverter for photovoltaic use is difficult to fix because there is not much information available. The effects of harmonic distortion on the electrical network itself and on the loads connected to it are not sufficiently studied and, finally, there are many difficulties in measuring the distortion obtained.

Within all specifications, the ones related with the current should be taken into account more than the voltage, since current harmonics are the most troublesome cause and because it is easier for the equipment manufacturer to demonstrate full compliance with the specification of current injection.

This specification is usually given in terms of total harmonic distortion THD. The magnitude representing any of the harmonics separately is called simple harmonic distortion SHD and is equally interesting for power companies. Electrical isolation: Another need of considerable importance in the connection with the electrical network is the obtaining of an adequate isolation.

This can be obtained with a transformer located between the network and the inverter. Several regulations from EU countries indicate that a solar inverter can not be connected to the grid unless some form of isolation is provided.

The self-generator and the electric company must use protections that can interrupt continuous fault currents. A fault in the inverter with continuous levels can saturate the distribution transformer of the electric company and cause service malfunction to other subscribers. This includes detecting that the photovoltaic field has enough power to be able to connect to the grid, closing a contactor at that moment and starting to operate as soon as there is sun light.

At night the inverter must be fully disconnected. The control logic of the photovoltaic inverter will include a protection system that detects abnormal operating situations such as: Lack of continuous ground. Abnormal conditions in the electrical network voltage, frequency, etc. Losses in one phase. Stop the solar inverter. The inverter must be protected against voltage transients using varistors on the DC and AC side.


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