The KOSTAL PLENTICORE G3 L is a powerful and highly flexible 3-phase high-voltage hybrid inverter designed for larger residential, agricultural, and light commercial photovoltaic systems that require strong performance, future-proof expandability, and intelligent energy management in one compact platform. 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 via an external switchover device, and compatibility with selected high-voltage battery systems.

A major advantage of the PLENTICORE G3 L is its scalable power concept. The unit starts with a basic AC power of 15 kW and can be upgraded to 17.5 kW or 20 kW, allowing greater system flexibility without replacing the inverter. On the DC side, the L version offers 3 DC inputs, 1 combined PV / battery input, 3 independent MPPTs, a 95 V start-up voltage, 1000 V maximum system voltage, and a 75–900 V working voltage range. The optional battery input on DC3 supports a 95–650 V battery working voltage range and a maximum battery charge / discharge current of 30/30 A. The L model also supports high DC input currents of 30 A and up to 18 kW max. battery power per DC input, making it especially suitable for larger high-voltage storage systems.

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 advanced energy-management applications. Optional Type 2 DC overvoltage protection can also be retrofitted.

The PLENTICORE G3 L is also designed for practical installation and long-term reliability. It features IP65 protection, is suitable for indoor and outdoor installation, and comes in a compact housing size of 561 x 409 x 237 mm with a weight of 24.3 kg. The inverter reaches up to 98.21% maximum efficiency and 97.72% European efficiency, while standby consumption is only 3.5 W. The L version has a maximum output current of 32.0 A and a 3N~, 230/400 V, 50 Hz grid connection, making it a strong choice for demanding three-phase PV and storage applications.

If backup functionality is required, the PLENTICORE G3 L is backup-capable when used with an external switching device. For the L version, KOSTAL specifies 20 kVA nominal apparent power in backup mode, with 6.66 kW nominal power per phase, a start-up time of under 5 seconds with the manual KOSTAL BackUp Switch, and under 30 seconds with an automatic backup box.

Key product advantages

• 3-phase high-voltage hybrid inverter with optional battery activation

• Basic power 15 kW, upgradeable to 17.5 kW or 20 kW

• 3 independent MPPTs for flexible string design

• 3 DC inputs with 1 combined PV / battery input

• High DC input currents up to 30 A

• 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 L

• Product type: 3-phase high-voltage hybrid inverter

• Basic AC power: 15 kW

• Optional power upgrades: 17.5 kW / 20 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

• MPP range at rated output: 170 / 198 / 227 V up to 800 V, depending on activated power level

• Max. input current DC1 / DC2: 30 A

• Max. input current DC3: 30 A

• Max. PV short-circuit current DC1 / DC2: 42.0 A

• Max. PV short-circuit current DC3: 42.0 A

• Max. battery charge / discharge current: 30/30 A

• Battery working voltage range: 95–650 V

• Max. battery power per DC input: 18 kW

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

• Max. output current: 32.0 A

• Backup apparent power: 20 kVA

• Nominal backup power per phase: 6.66 kW

• Max. efficiency: 98.21%

• European efficiency: 97.72%

• Standby consumption: 3.5 W

• Protection class: IP65

• Installation: indoor / outdoor

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

• Weight: 24.3 kg

• Interfaces: 2 x LAN, WiFi, webserver, data logger, 4 digital outputs, Modbus/SunSpec (TCP)

• 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 BYD, Pylontech, and AXITEC configurations. For example, BYD compatibility is specified from BMU 1.13 / BMS 3.19, Pylontech Force-H1-V2 requires BMS module FC0500-40S-V2, Pylontech Force-H2-V2 requires FC0500M-40S-V2, and AXITEC SV1 / SV2 batteries require their corresponding dedicated BMS modules.

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.