PV Powered 3000 Service Manual download pdf (Page 8)

PVI 3000S, 4000S, 5000S, 5300 Series Inverters

Installation and Operation Manual (Rev A)

The string PV concept

The use of string PV concept significantly reduces the cabling costs on a photovoltaic system. The

use of strings of several PV modules in series and multiple parallel strings of PV modules has

proven advantageous by delivering a high operating voltage to the inverter. This advantage

results in a higher system efficiency. Careful optimization of the overall system cost and

efficiency lead to the choice of a 600V DC maximum system voltage for the power levels of the

PVI 3000S, PVI 4000S, PVI 5000S and PVI 5300 for use with 1kW to 7kW PV arrays per inverter.

Data acquisition, display and communication

The integrated data acquisition, display and communication capability of the PVI 3000S - PVI 5300

allows comprehensive tracking of data for understanding of system performance. All error

messages and operating conditions of the PVI 3000S - PVI 5300 as well as the PV system are

shown on the display. Information is not available when the inverter is off at night.

These functions allow complete and continuous monitoring of the photovoltaic system. Read-out

of data over the integrated interface and its display is only possible when the Inverter is in

operation.

An optional full-featured, “inverter-direct” data acquisition and data logging gateway and web-

based service is available from Solectria Renewables LLC, called Solrenview

(http://www.solrenview.com). You have the option to purchase the gateway, which plugs into

the inverter and to the facility’s internet service.

Technical structure of the PVI 3000S, PVI 4000S, PVI

5000S, and PVI 5300

A high frequency switching bridge circuit operating in connection with a high frequency

transformer provides galvanic isolation of the photovoltaic system from the building’s AC power

and electrical utility grid. The PV voltage and current are optimized in such a way that fluctuations

which are caused by differing sunlight strengths and PV module temperatures can still end up

producing the maximum possible power. Internal regulation of the PVI 3000S - PVI 5300 is

achieved using microcontrollers, which control the function of MPP (Maximum Power Point)

tracking.

The input PV voltage window is designed to cover a range of 200 to 550 VDC from the PV array

(600VDC maximum open circuit voltage). This means that modules from most manufacturers can

be used.

The inverter has very little standby power consumption and night–time losses (0.5 W). Even

when running, the control circuit power use of the inverter is reduced to a minimum, which helps

give the inverter high operational efficiency.

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PV Powered 3000 Service Manual Page 8