Growatt MID-HU with GridZeno.

Growatt MID-HU on the compatibility list, updated 31 October 2026.

• Live overview of solar, consumption and gridAll subscriptions
  Works
• Battery state of chargeAll subscriptions · requires a battery
  Works
• Stop selling at negative pricesSmart and Pro · Requires the installer to have turned export limiting on in the inverter. GridZeno only lowers a limit that's already set.
  Works
• Charge from the grid when power is cheapSmart and Pro · requires a battery · Requires Growatt's VPP protocol V2.01 in the inverter's firmware. Without it, GridZeno can only read and limit the export.
  Works
• Discharge the battery when power is expensivePro · requires a battery · Requires Growatt's VPP protocol V2.01 in the inverter's firmware. Without it, GridZeno can only read and limit the export.
  Works

Works: tested and measured on real hardware.

The dongle controls the battery with Growatt's VPP protocol.

Charge, hold and sell

A command with the battery's power and a duration. The dongle removes it itself when the block ends, and after a restart.

What it requires

VPP V2.01 in the inverter's firmware. Without it, GridZeno can only read the inverter and limit the sale.

Stop selling at negative prices

The inverter's export limit is set quarter by quarter by the selling price, but only where the installer has turned export limiting on. GridZeno only lowers a limit that's already set and never turns it on or off.

Another controller

If another system already has a VPP command on the inverter, the dongle leaves it alone and doesn't control the inverter.

Manual

When the control is on Manual, the dongle changes nothing on the inverter. It reads, and if GridZeno has changed something, it puts the inverter's own settings back, including your own charge limits.

The type code 5401, which the MID 33-50KTL3-HU has. The dongle reads it with the MOD TL3-XH map and knows it's a MID because you choose MID when you set up GridZeno.

What it requires

VPP V2.01 in the inverter's firmware (holding 30099 = 201).

How it differs from MOD TL3-HU

MID-HU is the larger of the two: MID 29.9K-50K-HU and MID 20-30KTL3-HU-L. MOD TL3-HU covers MOD 3000-15KTL3-HU, that is 3-15 kW.

Both have the type code 5401, so the dongle can't tell them apart by itself. That's why you choose MID when you set up GridZeno.

The port has the same name, Para.out, but on MID-HU the COM panel sits between the USB port and LOAD, with the ports in three rows.

See the page about MOD TL3-HU

How it differs from its neighbours

• Growatt MOD TL3-HU: The MOD TL3-HU has the same type code and the same port, Para.out with pins 5 and 1, but is 3-15 kW.
• Growatt MID TL3-XH: The MID TL3-XH has the type code 5400 and is connected with pins 3 and 4 in a 30-pin COM connector.

For the installer: the registers

What the dongle uses over Modbus, if you want to follow along or troubleshoot. Don't change the registers yourself while control is set to Automatic.

Control

The VPP command in 30407-30410: 30408 is the duration, 30409 the power in per cent, 30410 = 1 when charging. 30100 = 1 turns it on. The dongle writes in the order 30408, 30409, 30410, 30100, 30407 and removes it with 30407 = 0, 30409 = 0, 30410 back and 30100 = 0.

Protocol

Holding 30099 shows the VPP version: 201 is V2.01.

From the dongle's firmware and our notes on each inverter, not from the datasheet.

Network cable with RJ45 plug. Approx. 25 minutes.

Port

Para.out (RJ45)

Pin

A at pin 5 (485A), B at pin 1 (485B)

Where

In the COM panel on the underside between the USB port and LOAD, under a waterproof cover with four screws. The ports are in three rows: Para.out and DRMS at the top, Dry contact and BAT in the middle, Para.in and Meter at the bottom.

See the full installation guide for Growatt MID-HU

GridZeno Dongle for Growatt MID-HU

This one works.

Growatt MID-HU is the inverter GridZeno has been tested on. Check that your model is under MID 29.9K-50K-HU and MID 20-30KTL3-HU-L, and that a battery is fitted if you want the battery controlled by the electricity price. If it still doesn't suit you, you have 100 days' free return.