SMA SC 500HE-US Installation - Manual (Page 57)

SMA America, LLC 8 Electrical Connection
Installation Manual SC500HEUS-IA-US_en-14 57
8.4 Connection Options
There are various options for connecting the Sunny Central to the public grid and the PV modules.
When placing your order these options will enable you to adapt the Sunny Central connection area
to the characteristics of the PV modules and the grid. This section demonstrates the various connection
options.
8.4.1 DC Fuses
The Sunny Central must be equipped with 6 to 9 DC fuses. All other numbers of fuses contradict
UL listing of the inverter system. Every fuse has a separate rail to which 1 or 2 DC strings can be
connected.
The fuse characteristics have to match the following to ensure UL listing of the inverter system:
• Supplementary cartridge fuses suitable for branch circuit protection
• Type LDC, manufactured by Littelfuse
• Provided for branch circuit protection of DC field wiring
• Rated 600 Vac/Vdc
• Rated 130°C
• Maximum current rating of 450 A, no minimum limit
• Intermixing of different fuse ratings is possible
Such fuse types will be installed as defined in the option code upon order. The Sunny Central can be
delivered without fuses which are allowed to be provided in the end installation. Such fuses can be
ordered via SMA Service.
8.4.2 Grounding the PV modules
Depending on the configuration option, you can connect positive or negative grounded PV modules
to the Sunny Central.
8.4.3 Cable connection
You can connect all AC and DC cables to terminals or to busbars. Use cable lugs to connect the
cables to the busbars.
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The DC fuse installation on site must be done by SMA Service only.