PVI 3000S, 4000S, 5000S, 5300 Series Inverters
Installation and Operation Manual (Rev A)
8
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.