SMA Sunny Boy Storage 3.7 (SBS3.7-10)3.68kW single-phase AC-coupled battery inverter

Overview

The SBS3.7-10 is the 3680W version of Sunny Boy Storage, with 16A nominal output current at 230V. It charges and discharges a high-voltage battery of 100–550V through up to three 10A DC inputs and can supply 4600W for up to 60 seconds in battery-backup operation with an approved transfer switch. It has the widest battery approval of the three sizes, including LG RESU 10M, which SMA approves only for this model. Typical use: adding storage to an existing single-phase PV system.

• AC-coupled: works alongside any existing PV inverter
• 3.68, 5.0 and 6.0kW single-phase output
• Three battery DC inputs, 100–550V, 10A each
• Overload of 4.6–7.5kW for 60s in backup mode
• Manual 16A secure power supply socket
• IP65, 26kg, operation up to 3000m

How it works

Sunny Boy Storage is a battery inverter without PV inputs. It is connected on the AC side of the house and charges a high-voltage lithium-ion battery from surplus PV power measured by an SMA Energy Meter or Sunny Home Manager 2.0, then discharges it when the household draws from the grid. Because coupling happens on the AC side, it can be added to an existing PV system of any make, and PV and storage can be expanded independently of each other.

Key features

SMA describes it as a multistring battery inverter: three DC inputs of 10A each allow up to three battery units, with a 100–550V operating range and 600V maximum. Rated output is 3680, 5000 or 6000W, and in battery-backup operation the inverter can deliver 4600, 6300 or 7500W for up to 60 seconds after switching. Maximum efficiency is 97.5%. A manually switched secure power supply outlet of up to 16A keeps one circuit powered during an outage without extra hardware.

Installation and compatibility

The 535×730×198mm, 26kg enclosure is IP65 and convection cooled for indoor or outdoor walls up to 3000m. Full battery-backup needs an automatic transfer switching device approved by SMA; self-built switching circuits are not permitted. Approved batteries include BYD Battery-Box H, Premium HVS and HVM, LG RESU 7H/10H type C, RESU 10H/16H Prime and RESU Flex, Pylontech Force-H1-V2 and H2-V2, BMZ Hyperion, IBC era:powerbase and AXITEC AXIstorage Li SH, some with limited approval on the larger models.

Monitoring and grid codes

Commissioning uses the integrated web server via WLAN or Ethernet, or the SMA 360° App, and data reach Sunny Portal via Webconnect and the SMA Energy App. Interfaces are Ethernet, WLAN, CAN for the battery and RS485 for Modbus RTU, plus Modbus SMA/SunSpec. The datasheet lists CEI 0-21, VDE-AR-N 4105, EN 50549-1, C10/11, G99-1, IEC 62109-1/2, IEC 62477-1 and IEC 62040-1. Warranty extends from 5 to 10 years with product registration.

Questions and answers