Every cell, all the time
Each cell voltage, with the lowest and highest flagged and the spread computed for you.
Pre-order · ships on 10 November 2026
Your JBD smart BMS, on Wi-Fi and anywhere in the world
JBD boards protect a large share of DIY LiFePO4 packs and many ready-made batteries. JBD Monitor keeps them on screen all the time, not only when your phone is next to the pack: at home on your Wi-Fi and, through the free Cloud, from anywhere in the world.
- Plug & play: working in about a minute
- Colour screen + Wi-Fi dashboard
- Home Assistant · JSON · Jeedom
- Free Cloud, no subscription
Secure paymentFree cancellation2-year warrantyShipped from France
≈ 1 minto set up, plug & play
< 0.5 Wpowered by USB-C
0settings written to your battery
€0for the Cloud, forever
Plug & play
Plug it in, it works: about one 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.
- 0:001Plug
The supplied cable goes into the RS485 port of your JBD battery; USB-C into any phone charger.
- 0:152Connect
Join the box’s Wi-Fi from your phone, pick your home network and set a password. No app to install.
- 1:003Watch
Open the dashboard in any browser, add it to Home Assistant, and set your alerts.
- No app to install
- No driver, no PC
- No tools, no soldering
- Nothing changed on your battery
Pre-configured for your model
JBD, short for Jiabaida, makes the smart BMS found in countless home-built packs and inside a good number of commercial batteries. The board measures each cell, the temperature probes and the current, and most owners read it through the Bluetooth app while standing next to the battery. That works for a check. It does not tell you what happened last night.
JBD Monitor stays connected to the BMS through RS485 and keeps the data in view: on its own colour screen, on a local web dashboard you open from your phone, and in Home Assistant. It only reads, so the protection settings you chose in the JBD app stay exactly as they are.
What you get
Charge and current
State of charge, remaining capacity, voltage, current and power, live from the BMS.
Temperatures
The NTC probes wired to the board, with an alert when they cross your limits.
Protections and MOS
Charge and discharge MOSFET state and the protection the BMS has triggered, with its time.
Home Assistant
MQTT auto-discovery creates the sensors; a JSON API covers everything else.
Read-only, at home and in the Cloud
On your Wi-Fi and anywhere in the world through the free Cloud; nothing is written to the BMS.
Made for the way you use your JBD
DIY pack builders
Every cell and the balancing, to check your build and catch a weak cell early.
Off-grid, van or boat
Works without internet on the local Wi-Fi; with a connection, the Cloud shows it from anywhere.
A smart home
Every value in Home Assistant or Jeedom in about a minute, to drive your own automations.
Installers
Follow your customers’ systems with your own Cloud access, without asking for their passwords.
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
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
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.
See how the pack behaves over a whole day
The chart follows charge, discharge and state of charge hour by hour. With the cell spread next to it, you see at a glance whether the balancing keeps the cells together at the top of charge or whether the same cell runs ahead every afternoon.
With the free Cloud, follow the pack from anywhere in the world, compare weeks and export CSV files.
Live dashboardLive
SOC82%
Power-416W
Cell Δ12mV
ChargeDischargeState of charge
Try it
Your cells, as the box shows them
Pick a situation: this is what JBD Monitor shows you about each cell of your JBD pack. Values simulated.
Lowest
Highest
Gap
Temperature
Cloud Access · 100% Free
Cloud Access · 100% Free: your battery, live, from anywhere
A JBD board is often closed inside a battery case or a van floor, where nobody checks it. The free Cloud shows its cells, its MOS state and its protections from wherever you are, as long as the box has an internet link.
Live dashboard from anywhere
Every value and every cell, refreshed on their own, on your phone.
Up to 3 years of history
Charge, kWh in and out, temperatures, cell spread, day by day.
An e-mail if it goes quiet
Six hours without news from your box and we tell you.
Public JSON link
Home Assistant, Node-RED, a widget… no port forwarding, no VPN.
CSV export
Everything stored, ready for your spreadsheet.
Installer access
Your installer sees the system without your password; you keep your own access.
€0per month, per year, forever
Optional: your box stays fully local if you prefer. Switch the Cloud on or off in its settings at any time.
How the free Cloud works →Your JBD BMS in Home Assistant, Jeedom and Node-RED
Cell voltages, MOS state, temperatures and protections become sensors, so your automations can step in before the BMS has to cut the pack.
Home AssistantMQTT auto-discovery, no YAML
MQTTReadings published on your broker
JSON APIGET /api.json on your network
JeedomJSON plugin
Node-REDhttp request node
DomoticzHTTP/JSON polling
openHABHTTP binding
IFTTT · MakeThrough the free Cloud JSON link
Ideas people set up first
Know why the BMS cut
When binary_sensor.jbd_monitor_charge_mos turns off, a notification gives you the highest cell at that moment, the usual reason for a charge cut.
Shed load before the cut-off
If the lowest cell falls under 3.0 V, the dryer and the oven are switched off on smart plugs before the discharge MOS opens.
Surplus to the water heater
When the pack is above 95% and still charging, the water heater is switched on so the sun is not wasted.
Cold charging guard
When sensor.jbd_monitor_temperature_1 reads under 2 °C, a heating pad is switched on and you get a note that charging may be limited.
Plug & play
In Home Assistant in about a minute
Type the address of Home Assistant in the box, a user and its password: that’s it. The JBD Monitor device and all its sensors appear on their own, ready for your dashboards and the Energy page.
- No YAML, no HACS, no ESPHome
- 100 % local, works without internet
- Also JSON API, Jeedom, Node-RED, Domoticz
EnergyJBD Monitor
SOC
78 %Cell 01 voltage3.312 V
Cell delta9 mV
Temperature 124.5 °C
Cycles142
Last 24 hours
00:0006:0012:0018:0024:00
SOC
Made for JBD
| Models | JBD smart BMS with RS485 (SP series with RS485 module, UP16S inverter BMS) |
|---|---|
| Connection | RS485 port, RJ45 cable included |
| Your existing wiring | Untouched: the box reads, it never writes |
| Network | Your home Wi-Fi (2.4 GHz); works without internet |
| Integrations | Home Assistant (MQTT auto-discovery), JSON API, Jeedom, Node-RED, Domoticz, openHAB |
| Cloud | Free and optional: live dashboard, 3 years of history, CSV |
| Power | USB-C, under 0.5 W |
Another JBD model? Tell us when you order: your box is prepared and tested for it.
A wired link instead of a Bluetooth session
The box connects to the RS485 side of the JBD board with an RJ45 cable and is powered by any USB charger. Its colour screen shows the essentials next to the pack, and the Bluetooth app keeps working alongside it.
The design is that of Pylon-Monitor, which already watches Pylontech batteries, with an RS485 / CAN board and firmware written for the JBD protocol.
Designed and assembled in France
Each box is prepared and tested in France before it ships, by the team that makes Pylon-Monitor for Pylontech owners.
Questions before buying? Write to [email protected]: a person answers.
From your order to your first reading
- TodayYou pre-order at €49
Payment confirmed by e-mail, with your reference.
- Before dispatchWe prepare your box
We set it up for your JBD battery and test it before it leaves.
- 10 NovDispatch with tracking
You receive the tracking link by e-mail the same day.
- 2 to 10 days laterPlugged in, in about a minute
Cable in, USB-C power, your Wi-Fi: your readings appear.
JBD Monitor
€49.00
Pre-order price until 9 November 2026 · €59 afterwards
Shipping calculated at checkout
- JBD Monitor with colour screen and RS485 / CAN interface
- Communication cable
- USB-C cable
- Free Cloud Access, no subscription
Ships on 10 November 2026 · free cancellation until dispatch
- Secure paymentCard by Stripe
- Free cancellationUntil dispatch, 100% refunded
- 14-day returnsAfter delivery
- 2-year warrantyPlus 30 days if your model is not supported
- Shipped from FrancePrepared and tested before it leaves
JBD BMS app, Wi-Fi dongle or JBD Monitor?
What each option really gives you, in short.
| Bluetooth app | Wi-Fi dongle and maker’s cloud | JBD Monitor | |
|---|---|---|---|
| Readable from anywhere in the world | — | ✓ | ✓ |
| Keeps working without internet | ✓ | — | ✓ |
| Home Assistant sensors without ESP32 or YAML | — | — | ✓ |
| A screen next to the equipment | — | — | ✓ |
| Never changes a setting | — | — | ✓ |
JBD Monitor at a glance
- Reads
- JBD smart BMS with an RS485 port or the JBD RS485 module
- Port used
- The RS485 communication port of the BMS
- Data
- Every cell, temperatures, current, state of charge, cycles, MOSFET state, protections
- Pack sizes
- From 4S packs to 16S home storage and beyond: tell us your cell count
- Where you see it
- Screen on the box, home Wi-Fi, Home Assistant, free Cloud
- Price
- €49, cable included, ships from France
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