GoodWe GW3600-SBP-203.68kW single-phase AC-coupled battery inverter for 48V batteries

Overview

The GW3600-SBP-20 is the 3.68kW model of GoodWe's SBP G2 AC-coupled battery inverters. It is installed on the AC side of an existing single-phase PV system and charges a 48V lithium battery at up to 75A and 3.6kW, discharging at up to 3.9kW. The backup output supplies 3.68kVA with 7.36kVA for 10 seconds and switches over in under 10ms. It suits homes that already have a PV inverter and want to add storage and backup without rewiring the PV side.

• Retrofit storage on the AC side of existing PV
• 48V battery input, 40–60V, up to 120A
• 3.68kW, 5kW and 6kW single-phase models
• Backup under 10ms, overload for 10 seconds
• Isolated topology, IP65, natural convection

How it works

The SBP G2 is a battery inverter without PV inputs. It connects on the AC side of a house that already has a grid-tied PV inverter, measures the power flow with its meter and charges a 48V lithium battery when there is surplus, then discharges it to cover household demand. The existing PV inverter stays in place, which makes the SBP G2 a straightforward way to add storage to an older installation.

If the grid fails, the BACK-UP output switches over in less than 10ms and supplies selected circuits from the battery, with a 10-second overload of up to 10kVA for starting appliances. Operating modes such as self-consumption, backup and time-of-use are selected in the app, and the battery reserve for outages can be set as a backup state of charge.

Installation and compatibility

The battery port covers 40–60V and accepts up to 75A on the 3.6kW model and 120A on the 5 and 6kW models. Approved batteries include GoodWe Lynx Home U (LX U5.0-30, LX U5.4-L, LX U5.4-20) and Lynx Home A, plus listed BYD, LG and Pylontech 48V models; lead-acid batteries are not supported. The isolated, fanless unit weighs about 19.5kg and is wall-mounted indoors or outdoors (IP65).

A two-CT meter such as GM1000D or GMK110D, purchased separately, measures both the grid connection and the PV inverter. GoodWe notes that a zero-export limit cannot be combined with an AC-coupled system and an existing PV inverter: the export limit must stay above 5% of the PV inverter's rated power. Several SBP G2 units of the same model can be paralleled, but not in a coupling scenario.

Monitoring and settings

The SBP G2 shares its user manual with the ES G2 series. Set-up runs through the SolarGo app and monitoring through SEMS+ using a Wi-Fi, WiFi/LAN or 4G dongle; the battery communicates over CAN and the meter over RS485. CEI 0-21, VDE-AR-N 4105 and EN 50549-1 certificates are shared with the ES G2, and the CEI 0-21 approval covers Lynx Home U and Lynx Home A batteries.

Questions and answers