GROWATT APX Battery Set 40kWh for MID XH inverter

Prices were last updated on February 1, 2026

Technical Specifications

Category	Specification
Product Type	High‑Voltage (HV) Battery Storage System
Total Usable Capacity	40 kWh (8 × 5 kWh modules)
Battery Chemistry	Lithium‑Iron Phosphate (LFP), cobalt‑free
Included Components	8 × APX high‑voltage batteries, BMS controller, high‑voltage to inverter cable, APX series connection cable, 2 × battery bases
Modular Design	Stackable battery modules for easy expansion
Protection Rating	IP65 (dust and water resistant)
Warranty	Up to 10 years
Installation	Floor‑mounted, modular, indoor & outdoor
BMS Monitoring	SOC, cell voltage, temperature protection
Cell Voltage Balancing	Integrated for longer battery life
Compatible Inverters	Growatt MID XH series three‑phase hybrid inverters

The GROWATT APX Battery Set 40kWh for MID XH inverter offers a complete and scalable energy storage solution for three-phase solar systems. Its modular, stackable design ensures easy installation, flexible capacity expansion, and efficient space usage. The integrated Battery Management System continuously monitors both overall battery performance and individual cell conditions, providing advanced protection, active cell balancing, and extended battery life. With IP65-rated protection, the system is suitable for indoor or outdoor installations, while remote firmware updates and Growatt’s 10-year warranty guarantee long-term reliability, safety, and peace of mind for residential and commercial applications.

GROWATT APX Battery Set 40kWh for MID XH inverter include:

Configuration for one MID XH inverter:

8 x APX batteries 5 kWh
1 x BMS (controller for batteries)
1 x Cables for splicing the BMS with the inverter – APX H – Hight voltage
1 x Growatt APX cable for connecting battery sets in series
2 x battery base – APX

GENERAL INFORMATION

Works with MID XH 3-phase series inverters
APXs LFP (lithium-iron-phosphate) batteries are cobalt-free batteries and achieve excellent levels of safety and reliability
Easy installation thanks to modular, stackable design
Remote firmware update
Long life, 10-year warranty
One battery + BMS controller for 3-phase inverters are required for commissioning.
APX batteries are IP65 rated for extended trouble-free operation indoors and outdoors
The batteries have a compact housing (690/185/295mm) and weigh only 50kg for each one
APXs monitor not only the total state of the battery, but also the individual cells, and provide complete protection of the battery system
Balancing the voltage of the cells allowing the battery to last longer
Growatt waranty plan

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