SMA SI-TB-BOX-10 - Manual (Page 41)

SMA America, LLC 6 Electrical Connection
Installation Manual SI_TDBOX-IA-eng-IUS122211 41
6.7 Connecting the PV Plant
1. Make sure that each PV inverter is protected in the Smartformer or in the AC sub-distribution of
the PV plant according to its rated current (see the PV inverter installation manual).
2. Connect the PE conductor to a vacant spring clamp terminal of a "Grounding" connecting
terminal plate (see Section 6.5).
3. Connect the N conductor to a vacant spring clamp terminal of a "Neutral N" connecting
terminal plate (see Section 6.5).
4. Shorten insulated conductors L1 and L2 and strip the insulation by
3
⁄
8
in. (10 mm).
Danger to life due to fire in incorrectly connected PV inverter
An excessive current load can overheat the AC connection of the PV inverter and cause a cable fire.
• Protect the AC output of each PV inverter according to the maximum permissible AC electrical
current strength (see the PV inverter installation manual).
• If 1 PV inverter is connected to the Sunny Island system, protect the PV inverter with miniature
circuit-breakers "F4" and "F5" of the Smartformer.
• If several PV inverters are connected to the Sunny Island system, install the AC sub-distribution
for the PV plant according to the locally applicable standards and regulations, and protect
the PV inverters individually.
• When selecting the wire size, consult the PV inverter installation manual and adhere to the
locally applicable standards and regulations.
PV inverter Rated current Replace the miniature
circuit-breaker?
Sunny Boy 2000HF-US / 2500HF-US / 3000HF-US 25 A Yes: see Section 12.2
Sunny Boy 3000-US / 3800-US / 4000-US 25 A Yes: see Section 12.2
Sunny Boy 5000-US / 6000-US 50 A No*
* The "F4" and "F5" miniature circuit-breakers of the Smartformer are preinstalled with 50 A on delivery.
In stand-alone grids:
Sunny Boy 7000-US /8000-US 50 A No*