Security
SMA America, LLC
10
SBCBTLUS-IUS094510
Installation Guide
2 Security
2.1 Appropriate usage
The Sunny Boy Combiner Box is a string combiner connecting up to 6 strings and linking them to the
inverter. All inputs must be fused in accordance with
National Electrical Code
®
NEC 690. The
Combiner Box is designed for the use with transformerless SMA PV inverters.
Principle of a PV power system with the Sunny Boy Combiner Box
Do not use the Sunny Boy Combiner Box for purposes other than those described here. Alternative
uses, modifications to the Sunny Boy Combiner Box or the installation of components not expressly
recommended or sold by the manufacturer void the warranty claims and operation permission.
The Sunny Boy Combiner Box can only be used in ungrounded array installations.
Position
Description
A
PV modules
B
Sunny Boy Combiner Box
C
Sunny Boy with DC Disconnect
D
AC main circuit breaker
E
Load
F
Meter
G
Grid
