Eltek Valere Theia He-t Manual de usuario descargar pdf (Pagina 25)

User Manual THEIA HE-t String Inverters 357115.013

Issue 1.0, 2011 April

4.3.4. DC Side (PV) Connections

The DC connections includes wiring from the PV modules, possibly through a combiner box,

to the inverter. The inverter may be configured with the optional Stringbox.

DANGER: Never work with live wires!

Disconnect the PV array before starting the connection on the DC side, as the PV

array can supply up to 600 V

to the inverter when exposed to sunlight. Ensure

that the output voltage or current from the PV modules is zero.

String Configuration

A PV string consists of a certain number of PV modules connected in series, which in turn

can be connected in parallel and attached to the inverter. Due to a large voltage range there

are several feasible PV string combinations, which must be accomplished according to the

module manufacturer guidelines and the local and national electrical regulations.

• The grounding configuration of the PV strings and the connection to the DC terminals

depend on the module technology used and the local or national electrical regulations.

• Use the correct system configuration according to the PV module manufacturer guidelines

and the relevant local and national electrical regulations for ungrounded or negative/positive

grounded PV strings.

• The inverter is delivered from the factory in an ungrounded PV string configuration as

standard, but may be configured for positive or negative grounded PV strings.

• The configuration of a negative grounded PV string differs from an ungrounded PV string

with the addition of a grounding strap.

• The configuration of a positive grounded PV string differs from an ungrounded PV string

with the connection to the DC terminal blocks and the addition of a grounding strap.

• String configuration depends on the module technology used. Due to the inverter having

one MPP-tracker the number and type of PV modules, and hence the PV power, should be

identical for every string.

• Both the positive and negative DC terminal block has three pairs of inputs, for parallel PV

string connection. Due to the inverter having one MPP-tracker the number and type of PV

modules and hence the PV power should be identical for every string.

NOTICE!

Maximum Voltage: The open circuit voltage (V

) must never exceed 600 V

under any

conditions. The voltage generated by PV modules is inversely proportional to the

temperature; at lower temperatures the PV voltage increases from the nameplate rating and at

higher temperatures the PV voltage decreases from the nameplate rating. Refer to 3.1.2.

Operation.

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Eltek Valere Theia He-t Manual de usuario Pagina 25