Solar Array Maximum Voltage; Galvanic Considerations Outdoor Unit; Solar Module Installation - SOLAR AC DC DLMDWA1-ACDC-18K Installation Manual

Solar Array Maximum Voltage.

The maximum Voltage Open Circuit (VOC) must be calculated to account for low
temperature voltage rise. Failure to do may damage the equipment and void warranty.
For guidance see AS / NZS 5033 4.2 PV array maximum voltage.
The maximum Voltage Open Circuit for this equipment is 380 Vdc.
For example, if the lowest recorded temperature is 4 to 0 degrees C and the VOC of a
module is 44.2 Vdc, one would multiply 44.2 by 1.1 equalling 4.42 volts.
Adding 44.2 and 4.42 equals the low temperature VOC of 48.62.
Dividing the maximum VOC input of 380 Vdc by 48.62 yields the maximum number of solar
modules 7.81. Rounding down yields 7 modules max at that low temperature.
From AS / NZS 5033 4.2 PV array maximum voltage.
considerations outdoor unit.
Galvanic
The outdoor unit is to be treated as a non-galvanically isolated regulator. The solar isolation
switches must be rated for the full array voltage and current. If connected to the AC supply,
the outdoor unit must be connected to the 230-volt AC distribution board via a type A or B
residual current and overcurrent device.

Solar Module installation

This manual contains information regarding the installation and safe handling of solar
photovoltaic module(s). All instructions should be read and understood before attempting to
install. If there are any questions, please contact our sales department for further
explanation. The installer should conform to all safety precautions listed in this guide when
installing the modules. Local codes and regulations must be followed.
Revision 25 July 2021 Page 15 of 36