UL AND IEC INSTALLATION GUIDE
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Installation Instructions UL-1703 and IEC
/ Rev. 05-2018 V.5
RECOM © Copyright 2018
www.recom-solar.com
4. ELECTRICAL INSTALLATION
Planning and Design
All modules are manufactured with a sealed junction box, pre-attached cables and locking connectors. These
components should not be modified or tampered with in any way.
• Ensure connectors are clean and dry before establishing connection.
• Ensure that all wire, fusing and disconnects are appropriately sized for the system design according to
national, regional, and local codes.
• Electrical characteristics are within plus or minus 5% of rated values for Isc, Voc, Impp and Vmp. Pmax
ranges between 0% to +3% of rated Pmax at standard test conditions (STC). However, modules will operate
under conditions that may be significantly different than STC. RECOM suggests multiplying specified rat-
ings by a minimum of 1.25 or more when designing the system and balance of system components. Refer
to local codes before planning and designing the system.
• Determine the maximum number of modules that may be connected in series using the following formula
Ns =maxs/Vocm
Where:
Ns
equals the maximum modules in series.
Vmaxs
equals the maximum system voltage.
Please refer to module data sheet for actual Vmax rating, as some models are rated for 1000 V UL
and 1000 V IEC.
Vocm
equals the module open circuit voltage at coldest conditions for the site (refer to local codes).
Module Wiring
• The module includes wires and polarized locking connectors from the junction box on the back of the
module. Field replacement of connectors or cables must be avoided and will void the product warranty. Po-
larized locking connectors of the same type, make and manufacturer are required for all series string wiring.
The maximum operating temperature of the wires and connectors should not exceed 85
0
C.
• When installing modules in landscape orientation, use the 1.3 meter lead lengths to ensure enough cable
length to make adjacent module-to-module string connections (assumes a maximum spacing of 50 mm
between adjacent modules).
• Always wire modules so that proper polarity is maintained. Avoid placing excessive tension on the cables.
• There is no limit to the maximum number of series strings that can be combined in parallel. However, each
string must include overcurrent protection with a maximum rating of 15 A. RECOM recommends the use of
