Growatt WIT 4–15K + AXE LV Battery – 4Blue B.V.

Flexible energy storage from 5 to 400 kWh

The Growatt WIT series consists of three-phase hybrid inverters with power ratings from 4 to 15 kW. These smart inverters integrate solar energy, battery storage, and backup functionality into one solution. Combined with the Growatt AXE LV battery, this creates a cost-effective solution suitable for both residential installations and small-scale commercial applications.

In this article, you will read more about the WIT inverters, the AXE battery modules, and the possibilities this combination offers. We will also discuss the connection options and installation practices.

Key features of the Growatt WIT series

✅ Hybrid function: suitable for both PV and battery storage
✅ Three-phase output: stable load distribution
✅ Asymmetric load: each phase supplies what is needed
✅ Power ratings: 4, 5, 6, 8, 10, 12, and 15 kW
✅ Efficiency up to 98.4%
✅ Advanced monitoring via the Shine app or ShineServer
✅ Integrated backup functionality, switching to backup within 10ms
✅ Generator connection or smart backup control possible
✅ Two battery inputs for larger systems
✅ CT connection included: includes 3 coils (up to 100A)
✅ ShineWiLan-X2 included

These inverters are ideal for installations where self-consumption needs to be optimised and where off-grid operation is desired.

NOTE: The WIT4-15K has an active fan.

Growatt AXE LV Battery

Scalable storage from 5 to 400 kWh

The Growatt AXE 5.0L-C1 is a Low Voltage (48V) battery module based on safe and sustainable LiFePO4 technology. The modular design allows the system to grow with your customer's energy needs. The AXE LV battery is compatible with the WIT 4-15k-HU inverters and the single-phase SPH inverters from Growatt.

Capacity and configuration:

⚡ 5 kWh per module
🔢 Up to 10 modules per stack: max. 50 kWh
🔗 Up to 8 stacks in parallel: max. 400 kWh
🔧 Each stack requires 1 battery base + cable set

So you can start with a single home and scale up to larger commercial setups.

Technical specifications:

Operating voltage: 48V (low voltage)
Communication: CAN/RS485 (automatic detection)
Protection class: IP20 – for indoor installation
Quiet and maintenance-free

What can you do with it?

The combination of the WIT inverter with AXE battery modules gives your customer maximum control over their own energy consumption.

✅ Store excess solar energy
✅ Use energy when needed
✅ Operate more independently from the grid
✅ Ready for the phase-out of net metering
✅ Flexibly expandable from 5 to 400 kWh

The modular design makes the system ideal for various applications – from family homes to commercial environments with larger energy demands.

Installation and connection options

The WIT series can be used traditionally (PV only) or in combination with battery storage and full backup. Thanks to the included CT coils, the system can operate immediately without a smart meter. The CTs are connected to the main connection, but you can also work with a Growatt smart meter (via CN5).

Note: When using this inverter as a retrofit, use 2 smart meters for correct operation. One smart meter on the main connection and one smart meter to measure the PV production of a third party.

Don't forget to add the ShineWilan-X2 for monitoring and configuration.

Backup and smart load

In the event of a grid failure, the system switches to off-grid mode. The home (Primary Load) remains powered at all times. If there is sufficient battery capacity (SOC), a second group – the Smart Load – can also be powered.

This Smart Load is connected to the ‘GEN’ port, which can also be used for connecting a generator. You can therefore use this port flexibly for different applications.

Connecting the AXE LV battery

Installing the battery modules is straightforward:

Stack the modules (max. 10 per stack)
Connect only the top battery to the inverter

When using 2 battery groups, connect them via the two available ports on the WIT inverter. For larger installations, follow diagram 7-2 from the manual.

Cabling:

Power cables: for connection between the top module and inverter
Communication cables:
- 1 battery: PCS ➝ CN1
- 2 batteries: second stack via PCS ➝ CN2

CT coils or smart energy meter:

smart meter: CN5

CT coils: Pins under the CN, see images below.

Summary: the benefits at a glance

✅ Scalable from 5 to 400 kWh
✅ Suitable for residential and commercial projects
✅ Simple, modular installation
✅ Monitoring via Shine app
✅ All-in-one system with backup and smart control

Curious about the complete Growatt WIT + AXE solutions?
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