DC Disconnect Switch
Every solar pump system must be equipped with a properly
sized DC disconnect switch. The switch must be installed
between the PV generator and the controller. It must meet
the following requirements:
minimum rating according to “Table 1: Minimum DC
disconnect rating” on page 17
continuous current rating according to maximum
current of the connected PV generator or higher
the switch must be rated for DC current, not AC
in order to meet UL62109-1 use a minimum 30 A
circuit breaker
A PV disconnect switch matching all requirements above
can be purchased from LORENTZ.
CAUTION – The use of a properly sized
disconnect switch is an important safety
measure and obligatory for a professional
installation of a solar pump system.
Table 1: Minimum DC disconnect rating
Controller Min. DC disconnect switch rating
PS2-150 50V DC
PS2-200 100V DC
PS2-600 150V DC
PS2-1800 200V DC
PS2-4000 375V DC
Electrical Conduit
Electrical conduit is recommended. We recommend the use
of an electrical conduit (pipe) to protect outdoor wiring
from the weather, from human activities and from damage
caused by animals. If you do not use a conduit, use a strong,
high-quality outdoor cable. Where cables enter the junction
box, install sealed strain-relief cable glands.
Wire sizes
CAUTION – In order to meet UL62109-1
the sizing of input and output cable should
be 1.25 times higher than sizing with rated
current.
For signal cables, the min. wire size should be 1.5 mm² (16
AWG). For power cables, the min. wire size should be 2.5
mm² (14 AWG). Compare your wire sizes to the LORENTZ
COMPASS sizing reports. Cables should be shielded to meet
EMC the requirement.
For outdoor use, cables meeting the requirements of 60245
IEC 66 are recommended. For indoor use, the recommended
cable type is defined in 60245 IEC 57. The installer must
always consider the local situation, codes of practice and
regulations and use a cable that meets these requirements.
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