Module by module
Each module of the cluster on its own line, so a weaker one stands out.
Pre-order · ships on 10 November 2026
Your WeCo battery, module by module, anywhere in the world
WeCo batteries are built to be stacked. WeCo Monitor shows each module of the cluster on a screen, on your home 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 WeCo 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 / CAN port of your WeCo 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
WeCo designs its LiFePO4 batteries in Italy, near Florence. The 4K4 and 5K3 modules are installed one by one or in clusters of several modules behind a hybrid inverter, and some are sold under the ZCS Azzurro name. The inverter reads the cluster as a whole: one percentage, one power figure. What happens inside each module stays hidden.
WeCo Monitor reads the battery management system over RS485 and shows the cluster as it really is: the charge of each module, the lowest and highest cell, temperatures and alarms. On a small screen by the battery, on your home Wi-Fi, in Home Assistant and, through the free Cloud, anywhere in the world. It only reads, so the link with your inverter stays as your installer set it.
What you get
Cell extremes
The lowest and highest cell of each module and the gap between them.
Temperatures
Cell and board temperatures, with an alert when they leave your limits.
Health and cycles
State of health and cycle count, to follow the battery over the years of its warranty.
Phone dashboard
On your Wi-Fi at home, and anywhere in the world through the free Cloud.
Home Assistant
MQTT discovery and a JSON API for every other automation tool.
Made for the way you use your WeCo
A home battery in the garage
Charge, cells and temperature on your phone, without walking to the battery or opening an app next to it.
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
WeCo 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.
The cluster’s day at a glance
The chart shows when the battery starts charging, when it reaches full, how hard the house draws on it in the evening and what is left at sunrise. Next to it, the modules side by side: if one of them always ends the day lower, you see it after a week instead of after a year.
The free Cloud shows it from anywhere in the world, keeps three years of data and exports it to a spreadsheet.
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 WeCo Monitor shows you about each cell of your WeCo pack. Values simulated.
Lowest
Highest
Gap
Temperature
Cloud Access · 100% Free
Cloud Access · 100% Free: your battery, live, from anywhere
A WeCo cluster is meant to last for many years, and the signs that matter appear slowly: one module ending lower, a cell drifting, the health figure moving. The free Cloud shows them from wherever you are and keeps three years of history to compare against.
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 WeCo battery in Home Assistant, Jeedom and Node-RED
Charge, power, each module, the cell extremes, temperature and state of health become sensors, ready for automations and long-term charts.
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
One module behind
If sensor.weco_monitor_module_2_soc ends the evening more than 5 points under the other modules three days in a row, you get a notification to have the cluster checked.
Surplus as hot water
When sensor.weco_monitor_soc is above 95% and the battery is still charging, the water heater is switched on instead of exporting.
Monthly health report
On the first day of each month, a message gives you the state of health, the cycle count and the widest cell gap of the month.
Evening reserve
Below 30% after sunset, the dishwasher and the tumble dryer wait for the next morning's sun.
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 WeCo 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
EnergyWeCo Monitor
SOC
78 %Power+1 450 W
Cell min3.309 V
Temperature24.5 °C
Soh98 %
Last 24 hours
00:0006:0012:0018:0024:00
SOC
Made for WeCo
| Models | WeCo 4K4 and 5K3 low-voltage modules (LV clusters) |
|---|---|
| Connection | RS485 / CAN 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 WeCo model? Tell us when you order: your box is prepared and tested for it.
A box beside the cluster
An RJ45 cable from a free RS485 port of the cluster to the box, a USB charger for power. Its colour screen shows the essentials next to the battery.
It shares its design with Pylon-Monitor, which already watches Pylontech batteries in many homes, and uses an RS485 / CAN board and firmware written for the WeCo BMS.
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 WeCo 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.
WeCo Monitor
€49.00
Pre-order price until 9 November 2026 · €59 afterwards
Shipping calculated at checkout
- WeCo Monitor with colour screen and RS485 / CAN interface
- RJ45 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
WeCo app, Wi-Fi dongle or WeCo Monitor?
What each option really gives you, in short.
| Bluetooth app | Wi-Fi dongle and maker’s cloud | WeCo 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 | — | — | ✓ |
WeCo Monitor at a glance
- Reads
- WeCo 4K4 and 5K3 modules in low-voltage clusters
- Port used
- A free RS485 port; the inverter keeps its own link
- Data
- Charge of the cluster and of each module, cell extremes, temperatures, health, cycles, alarms
- Cluster size
- From one module to a full cluster: tell us how many you have
- Where you see it
- Screen on the box, home Wi-Fi, Home Assistant, free Cloud
- Price
- €49, cable included, ships from France
Every WeCo module, in one view
Pre-order now. The box is tested on WeCo modules before it ships 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