SMA PT100M-NR - Manual (Page 8)

Installation and Electrical Connection SMA Solar Technology AG
8 PT100MNR-IEN083510 Installation Guide
4.1 Cabling Recommendations
The cable length and quality will affect the signal quality. To achieve a good quality signal, observe
the following cabling instructions:
Outdoors
For outdoors, use a cable with the following basic properties.
• Cross-section: min. 4 x 0.25 mm
2
, min. 4 x AWG 24
• UV-resistant
We recommend the following cable types:
• Lapp cable: Unitronic S-LifY11Y 4 x 0.34 mm
2
, order no.: 7038 861
• UL-listed Lapp cable: UNITRONIC S-LifY11Y 4 x 0.34 mm², order no.: 7038 865
Indoors
If you protect the cable against UV radiation for use outdoors by means of a suitable cable channel,
you can also use a non-UV-resistant (indoor) cable with the basic properties mentioned above.
We recommend the following cable types:
• Lapp cable: Unitronic LiYY 4 x 0.25 mm
2
, order no.: 0028 304
• UL-listed Lapp cable: UNITRONIC LiYY UL/CSA 4 x AWG22/7, order no.: 0022 604
• Helukabel: TRONIC LiYY 4 x 0.25 mm
2
, order no.: 18031
4.2 Selecting Where to Install
Consider the following points when selecting where to install:
• Select a solar cell which is never in the shade during the day.
• The module temperature sensor is fixed to the rear.
• Take into account the prefabricated cable length of 2.5 m.
4-wire system
To offset measuring errors which occur as a
result of cable resistance, connect the
temperature sensor via a 4-wire system. This
type of connection ensures the current feed and
voltage measurement are performed by separate pair cables. The cable length must not
exceed 30 m.
Protect the connection interfaces against weather conditions.
When extending the sensor cable, protect the connection interface against weather
conditions (e.g. by using a junction box or terminal box).