The KOSTAL PLENTICORE G3 S is a highly flexible 3-phase hybrid inverter designed for photovoltaic systems that require performance, expandability, and intelligent energy management in one compact unit. The inverter can be used as a PV inverter, and with optional activation it can also operate as a hybrid inverter with battery connection. KOSTAL positions the PLENTICORE G3 platform as an all-in-one solution with 3 independent MPP trackers, optional battery input, optional power upgrade, backup capability with an external switchover device, and compatibility with selected high-voltage batteries.

A major advantage of the PLENTICORE G3 S is its scalable power concept. The unit starts at 4.0 kW basic power and can be upgraded to 5.5 kW or 7.0 kW, allowing greater system flexibility without changing the inverter. On the DC side, the S version offers 3 DC inputs, 1 combined PV/battery input, 3 independent MPPTs, a 95 V start-up voltage, 1000 V max. system voltage, and a 75-900 V working voltage range. The optional battery input on DC3 supports a battery working voltage range of 95-650 V and a maximum battery charge/discharge current of 17/17 A.

The inverter is built for smart and efficient operation. KOSTAL highlights features such as fast self-learning shadow management, dynamic active power control, 24-hour home-consumption measurement with a compatible energy meter, and low conversion losses due to DC coupling and high-voltage battery support. For system integration, the PLENTICORE G3 includes 2 x LAN, WiFi, integrated webserver, data logger, 4 digital outputs, and Modbus/SunSpec (TCP) for Smart Home and energy-management applications.

The PLENTICORE G3 S is also designed for practical installation and long-term reliability. It features IP65 protection, is suitable for indoor and outdoor installation, supports optional Type 2 DC overvoltage protection, and offers a compact housing size of 561 x 409 x 237 mm. The inverter achieves up to 98.03% maximum efficiency and 97.20% European efficiency, with a standby consumption of 3.5 W. The S version has a maximum output current of 11.2 A and a 3N~, 230/400 V, 50 Hz grid connection.

If backup functionality is required, the PLENTICORE G3 platform is backup-capable when used with an external switching device. For the S version, KOSTAL specifies 7.0 kVA nominal apparent power in backup mode, with a start time of under 5 seconds when used with the manual KOSTAL BackUp Switch and under 30 seconds with an automatic backup box.

Key product advantages

• 3-phase hybrid inverter with optional battery activation

• Basic power 4.0 kW, upgradeable to 5.5 kW or 7.0 kW

• 3 independent MPPTs for flexible string design

• 3 DC inputs with 1 combined PV / battery input

• Backup-capable with external switchover device

• 2 x LAN, WiFi, webserver, data logger, 4 digital outputs

• Modbus/SunSpec (TCP) for advanced system integration

• Self-learning shadow management and dynamic power control

• IP65 protection for indoor and outdoor installation

• Compatible with selected high-voltage battery systems and a required compatible KOSTAL energy meter for approved battery operation

Technical specifications

• Brand / Series: KOSTAL PLENTICORE G3 S

• Product type: 3-phase hybrid inverter

• Basic AC power: 4.0 kW

• Optional power upgrades: 5.5 kW / 7.0 kW

• Number of MPPTs: 3

• Number of DC inputs: 3

• Combined PV / battery input: 1

• Battery input: DC3, optional activation

• Start-up voltage: 95 V

• Max. system voltage: 1000 V

• Working voltage range: 75-900 V

• Battery working voltage range: 95-650 V

• Max. battery charge / discharge current: 17/17 A

• Grid connection: 3N~, 230/400 V, 50 Hz

• Max. output current: 11.2 A

• Max. efficiency: 98.03%

• European efficiency: 97.20%

• Standby consumption: 3.5 W

• Protection class: IP65

• Installation: indoor / outdoor

• Dimensions (H x W x D): 561 x 409 x 237 mm

• Warranty: 10 years (5 + 5), subject to KOSTAL Smart Warranty / Smart Warranty Plus conditions

Compatible batteries

Important: Battery operation requires optional battery activation, and KOSTAL also specifies a compatible energy meter for approved battery use. Final compatibility should always be checked against the current KOSTAL release list, inverter software version, and battery/BMS version.

Released battery families for PLENTICORE G3

• AXITEC AXIstorage Li SV

  • SV1 10.1 / 13.5 / 16.9 / 20.2 / 23.6

  • SV2 6.7 / 10.1 / 13.5 / 16.9

• BYD Battery-Box HV

  • 6.4 / 7.7 / 9.0 / 10.2 / 11.5

• BYD Battery-Box Premium HVS / HVM

  • HVS 5.1 / 7.7 / 10.2 / 12.8

  • HVM 8.3 / 11.0 / 13.8 / 16.6 / 19.3 / 22.1

  • Certain configurations reference the BYD Battery-Box Premium HV Combiner Box CBH-40A.

• Dyness Tower

  • T7 / T10 / T14 / T17

• Dyness Tower Pro

  • TP7 / TP11 / TP15 / TP19

• LG RESU FLEX

  • FLEX 8.6 / 12.9 / 17.2

• PYLONTECH Force H1

  • H1 10.65 / 14.20 / 17.76 / 21.31 / 24.86

• PYLONTECH Force H2

  • H2 7.10 / 10.65 / 14.21 / 17.75

• PYLONTECH Force H3

  • H3 10.24 / 15.36 / 20.48 / 25.6

• VARTA.wall

  • 10 / 15 / 20

• ZYC SIMPO HV

  • 6.4 / 9.6 / 12.8 / 16 / 19.2 / 22.4 / 25.6

Important compatibility notes

• Battery input is optional and must be activated before battery operation is possible.

• A compatible KOSTAL Smart Energy Meter / KOSTAL Energy Meter is required for approved battery combinations listed by KOSTAL.

• KOSTAL’s documentation also notes battery- and BMS-specific requirements for some approved systems, including certain Pylontech and AXITEC configurations.

Note: Optional battery and power upgrades are available separately. Battery functionality requires activation and a compatible KOSTAL energy meter. Backup operation requires an external switchover device. Battery compatibility must always be verified against the latest KOSTAL approved battery list.