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Home / Connecting Growatt Monitor

Connecting Growatt Monitor

About a minute to plug in and connect. A screwdriver only if your model uses a terminal block or a cover on its communication ports.

  • ≈ 1 minto plug in and connect
  • 0app to install
  • 0settings changed on the inverter

Try the setup Steps for Growatt →

RJ45 RS485 socket and USB-C power input of Growatt Monitor

In the box

  • Growatt Monitor with colour screen and RS485 / CAN interface
  • Communication cable for the inverter’s RS485 link, matched to your model
  • USB-C cable
Plug & play

The whole installation, in about a minute

Your box arrives prepared and tested for your Growatt model. No app, no driver, no tools, and not a single setting to change on your inverter.

  1. 0:00
    1Plug

    The supplied cable goes into the RS485 port of your Growatt inverter; USB-C into any phone charger.

  2. 0:15
    2Connect

    Join the box’s Wi-Fi from your phone, pick your home network and set a password. No app to install.

  3. 1:00
    3Watch

    Open the dashboard in any browser, add it to Home Assistant, and set your alerts.

Pre-configured for your model

Try it

The setup, screen by screen

Exactly what you will see on the box and on your phone. Click Next.

GROWATT MONITOR

Starting...

The box

14:32

Your phone, as usual

1 / 4Plugged in

Cable in the RS485 port, USB-C in a charger. The box starts.

Simulation. The texts of the box are the real ones, in English as on the box.

Before you start

Almost nothing to prepare

A USB-C charger

Any phone charger near the equipment, or a USB port. The box uses under 0.5 W.

2.4 GHz Wi-Fi where the box sits

Your usual home Wi-Fi: almost every router broadcasts 2.4 GHz. Internet is not even required at home.

Your phone

For the one-minute setup through the box’s own Wi-Fi. No app, any browser.

Nothing else

No tools, no PC, no driver, no setting to change on the inverter. Your box arrives prepared for your Growatt model.

If something is off

What does the screen say?

The box’s screen tells you where it stands. Find your case below.

The screen stays black

The USB-C charger or cable is the usual suspect: try another one, or a computer’s USB port. The box needs very little, under 0.5 W.

The screen says “Setup: join the Wi-Fi”

The box is waiting for your home network. Join the MoniWatt-Setup-… Wi-Fi it shows; if the page does not open, type http://192.168.4.1 in the browser.

My home network is not in the list

The box only sees 2.4 GHz networks. Most routers broadcast both: pick the 2.4 GHz one, or type its name in “Or type its name”.

The screen shows an address but no values

Check that the cable is in the RS485 port of the inverter, not in the battery (BMS) or meter port. Unplug and plug it back firmly.

http://moniwatt.local does not open

Some phones do not resolve .local names. Type the address shown at the bottom of the screen instead, for example http://192.168.1.57.

Still stuck?

Write to [email protected] with a photo of the screen and of the port: a person answers.

In detail

Steps for Growatt

Before you start

  • A Growatt hybrid inverter in normal operation.
  • A USB charger and a socket near the inverter.
  • 2.4 GHz Wi-Fi at the inverter.

Growatt hybrids have several communication connections: the USB port of the Shine stick, the meter link, the battery link (BMS) and the RS485 link for monitoring. Leave the meter and the battery alone. Depending on the model, the monitoring link is an RJ45 socket or two terminals on the communication board. Send us a photo of the port area and the model label with your order; the cable we supply matches your inverter.

2Modbus address

The inverter answers on a Modbus address, 1 unless someone changed it. With several inverters, each has its own address; check them in the inverter settings.

3Connect

Connect the supplied cable to the RS485 link and to the box, then power the box with USB-C.

Switch nothing off and open nothing on the power side of the inverter. This is a low-voltage communication link only.

4Wi-Fi and password

Join the box’s setup Wi-Fi from your phone, choose your home network and set your dashboard password.

5Compare with the inverter

Open http://moniwatt.local. Battery SOC, PV power and grid power should match the inverter display within a few watts.

Troubleshooting

  • No data: wrong link (meter or BMS), A and B wires swapped on a terminal block, or a different Modbus address.
  • Odd values: the model chosen in the settings does not match the inverter (single-phase or three-phase, older or newer protocol).
  • Still stuck: send the diagnostics page and your model to [email protected].
Home Assistant automations

Your appliances run on the sun, by themselves

Growatt Monitor tells Home Assistant how much the panels produce, in real time. Four simple rules, and the washing machine, the water heater and the car use your sun instead of the grid. Watch a day:

10:00

Your solar production

Your consumption

OverviewLive

Automations

  • Washing machine on the sun
  • The car follows the sun
  • Hot water for free
  • Gentle evening heating

Logbook

    • Solar production
    • House and heating
    • Washing machine
    • Water heater
    • Electric car
    • Battery level
    • From the grid
    • Sold to the grid for little
    Solar used at home0 %
    Bought from the grid0
    Self-sufficiency0 %
    Saved on this day0vs. the same day without automation
    Over a year0if 150 days look like this one
    Try the four rules yourself →

    Simulation of a sunny day for a house with 5 kWp of panels, a 10 kWh battery, a car that needs 10 kWh and a water heater. The energy delivered to each appliance is the same in both scenarios; only the timing changes. Your figures depend on your system, your tariff and the weather.

    Then

    Once it runs, in one more minute

    Home AssistantThree fields in the box, and every sensor appears on its own. The free CloudTick one box in the settings to see your system from anywhere, with alerts. What it showsEvery value, explained, and what the dashboard works out for you.

    Questions about the installation

    Do I need to switch anything off?

    No. The RS485 port is a low-voltage communication port: you plug in while the inverter runs, nothing to open inside.

    Do I need an app or an account?

    No. Setup is done in your phone’s browser, through the box’s own Wi-Fi. The free Cloud account is optional, only to see your system from away.

    Will it change my settings?

    No. The box only reads: work mode, charge settings and limits of your inverter stay exactly as they are.

    What if my Wi-Fi changes?

    Change it from the box settings page. If the box cannot reach your network for a few minutes, it opens its setup Wi-Fi again by itself.

    Can my installer set it up for me?

    Yes, and they can follow your system from their own Cloud access, while you keep yours.

    All questions →

    Keep reading

    ◎Features→▤Specifications→⌂Home Assistant→☁Cloud→⏱Runtime calculator→✎Guides→

    Your Growatt inverter, live at home and anywhere in the world

    Order Growatt Monitor today. Prepared and tested for your Growatt model, dispatched on 10 November 2026.

    Plug & play: working in about a minute

    Pre-order for €49Pre-order price · €59 from 10 Nov · ships on 10 November 2026 · free cancellation until dispatch