9 of 12
•
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, when doing so,
each string must include overcurrent protection with a maximum rating of 15A. SunEdison recommends the use of DC
rated fuses or overcurrent protection devices with the appropriate maximum voltage rating.
•
Do not connect modules of three or more strings directly to a parallel bus.
•
The cross-sectional area of cable and the connector type must be selected to align with the overall system design
and should include the maximum short circuit current of the system, maximum operating temperatures, and cable run
lengths.
•
For field connections, use at a minimum #12 AWG/4 mm
2
wires insulated for a minimum of 85°C. Use copper wire only.
5.3 groundIng
warnIng: only negative grounding circuits (negative polarity to ground) shall be used within the array design.
Transformerless inverters with floating grounding are not acceptable.
•
All module frames and mounting racks must be properly grounded in accordance with all local and national electrical
codes, using methods and devices that are UL 1703/2703 certified.
•
Lug Method: A copper, stainless steel, or tin plated grounding lug that is rated for outdoor use and uses no smaller than
a #12 wire is acceptable. The use of a copper split bolt connector is authorized for use as well.
•
Alternative Methods: Other code compliant frame grounding methods that are certified to UL 1703/2703 are
acceptable.
•
The frame has predrilled holes marked with a grounding sign as illustrated below. These holes should be used
exclusively for grounding purposes and may not be used for any other purpose.
Do not drill additional or modify
existing holes in the frame.
Figure 1: Image of the grounding holes
Installation Manual: sunedison silvantis 60 Cell Pv Modules
© Copyright 2013 SunEdison, Inc.
