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Home / Connecting JBD Monitor

Connecting JBD Monitor

About a minute to plug in and connect, for JBD smart BMS owners.

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

Try the setup Steps for JBD →

JBD Monitor RJ45 socket and USB-C power socket

In the box

  • JBD Monitor with colour screen and RS485 / CAN interface
  • Communication cable
  • USB-C cable
Plug & play

The whole installation, in about a minute

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

  1. 0:00
    1Plug

    The supplied cable goes into the RS485 port of your JBD battery; 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.

JBD 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 battery. Your box arrives prepared for your JBD 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 battery, firmly clicked in. With several batteries, use the port given in the steps below.

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 JBD

Check your board

JBD boards come with different communication options: Bluetooth, a UART connector, an RS485 port, sometimes CAN. JBD Monitor uses RS485. If your board only has the UART connector, JBD sells an RS485 module that plugs into it; if you are not sure, write to us with a photo before ordering.

1Locate the RS485 port

On boards and batteries with an RJ45 RS485 socket, use it directly. On SP boards with the RS485 module, connect the module to the BMS as JBD intends and plug the box into the module. If the Bluetooth module sits on the same connector, tell us: we check your setup before shipping.

2Connect and power

Plug the supplied cable into the box, then power the box from a USB charger. The screen turns on.

Never connect the box to the balance leads or the pack terminals. Communication port only.

3Wi-Fi

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

4Dashboard

Open http://moniwatt.local. Cells and pack values appear within seconds. Compare one cell voltage with the JBD app to be sure everything matches.

If it stays empty

  • Some JBD boards go to sleep when the pack is idle: a small load or a charge wakes them up.
  • Check that the RS485 module is the one JBD supplies for your board.
  • Send us the diagnostics page and a photo of the board label.
Home Assistant automations

Your appliances run on the sun, by themselves

JBD Monitor tells Home Assistant when the battery fills up and when it runs low. 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 battery runs, nothing to open.

    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: the limits, switches and settings of your battery 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→

    Give your JBD BMS a permanent dashboard

    Order JBD Monitor, shipped on 10 November 2026 and tested on a JBD smart BMS before it leaves.

    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