Introduction - Eltek Valere Theia He-t User Manual

1. Introduction

The THEIA HE-t inverters are among the most efficient single phase grid connected (grid-tie)
inverters on the market, which will result in high yields from the solar array.
In a grid connected photovoltaic system, the interface between the solar array
DC to AC
and the utility grid consists of an inverter, which converts DC produced from
the solar array into AC adapted to the voltage and frequency of the utility grid.
Figure 1.1: System overview
THEIA HE-t The topology of the THEIA HE-t series consists of an embedded high
series frequency transformer, which provides galvanic isolation from the utility grid
and thereby meets the strictest safety standards. Because of great adaptability
and user friendliness, the THEIA HE-t is the perfect choice for any
photovoltaic (PV) installation. Different configuration options make it suitable
for crystalline as well as thin-film modules, and make it easy and affordable to
configure for various conditions and country specific requirements. The
compact and lightweight construction provides for easy and straightforward
installation and maintenance.
Integrated The inverter is equipped with an integrated web server, which records data on
Web Server a daily, monthly, and yearly basis. All information is displayed numerically
and in graphs on a color LCD screen on the front of the inverter. The data is
also accessible either directly from a PC or via the internet. All settings and
data are saved in the integrated logger, which provides storage of data with
fifteen minutes intervals for one week, daily intervals for one year or weekly
intervals for thirty years.
Automatic The system is fully automatic. The inverter starts up in the morning when the
System solar array generates enough power. During the day the maximum power point
tracking (MPPT) function ensures the highest possible energy harvest from the
PV panels. The inverter goes into 'sleep' mode at dusk when the solar array
stops generating power, ready to automatically start-up again in the morning.
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User Manual THEIA HE-t String Inverters
357115.013, Issue 1.0, 2011 March