SMA Sunny Boy 3000TL-US, SB 3000TL-US-22), Sunny Boy 3800TL-US, SB 3800TL-US-22), Sunny Boy 4000TL-US Technical Note
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EPSCompl-US-TB-en-14 | Version 1.4
CA
US
1 Introduction
The Secure Power Supply (SPS) feature is a factory-installed option to the following types of inverters:
• Sunny Boy 3000TL-US (SB 3000TL-US-22)
• Sunny Boy 3800TL-US (SB 3800TL-US-22)
• Sunny Boy 4000TL-US (SB 4000TL-US-22)
• Sunny Boy 5000TL-US (SB 5000TL-US-22)
• Sunny Boy 6000TL-US (SB 6000TL-US-22)
• Sunny Boy 7000TL-US (SB 7000TL-US-22)
• Sunny Boy 7700TL-US (SB 7700TL-US-22)
When equipped with an SPS module the inverter is capable of switching from interactive operation
to stand-alone operation. In stand-alone operation the inverter can supply standby power to a
dedicated power outlet that has been wired to the SPS module within the inverter. When sufficient
sunlight is available this outlet can be used to run small appliances and charge electronic devices
during prolonged utility power outages.
2 Code Compliance
Article 690 Solar Photovoltaic (PV) Systems of ANSI/NFPA 70, National Electrical Code® defines
an interactive system as "a solar photovoltaic system that operates in parallel with and may deliver
power to an electrical production and distribution network," and a stand-alone system as "a solar
photovoltaic system that supplies power independently of an electrical production and distribution
network."
Sunny Boy TL-US inverters are intended to be installed and operated primarily in utility-interactive
systems. When equipped with the SPS module the inverter is capable of switching from interactive
operation to stand-alone operation to supply power to a dedicated 120 V power outlet.
Section 690.61 of ANSI/NFPA 70, National Electrical Code®, permits a normally interactive system
to operate as a stand-alone system when disconnected from the utility electrical power system.
SunnyBoy TL-US inverters equipped with the SPS module comply with National Electrical Code
®
690.61 for interactive and stand-alone operation.
Section 690.10(B) of ANSI/NFPA 70, National Electrical Code
®
requires overcurrent protection for
conductors “between the inverter output and the building or structure disconnecting means” in a
stand-alone system. When installed and wired according to the installation manual, the SPS outlet
conductors form a dedicated circuit that is isolated from other premises wiring of the building or
structure. Power to the SPS outlet can only be supplied from the inverter and the inverter operates as
a current limited device. Therefore, the conductors between the inverter and the SPS outlet should not
require additional overcurrent protection.
SUNNY BOY 3000TL-US / 3800TL-US / 4000TL-US /
5000TL-US / 6000TL-US / 7000TL-US / 7700TL-US
Secure Power Supply
Technical Note
2 Code Compliance SMA America, LLC
2 EPSCompl-US-TB-en-14 Technical Note
Figure1: Inverter in utility-interactive operation
Figure2: Inverter in stand-alone operation (secure power)
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