WeCo Monitor FAQ

WeCo 4K4 and 5K3 modules installed in low-voltage clusters. Tell us your models and how many modules you have when you order; we test that setup before shipping.

Not with this edition, which reads low-voltage clusters. Write to us with your configuration; high-voltage stacks are on our list.

Send us the label: many of them share the WeCo BMS, and we confirm before you order.

No. The box uses a free RS485 port and only reads. The cluster keeps talking to the inverter as before.

No. The screen, the local dashboard, MQTT and JSON work without internet. With an internet link, the free Cloud shows the battery from anywhere.

10 November 2026. If we cannot meet it, full refund unless you choose to wait.

Yes, until dispatch, fully refunded including shipping.

14 days to return after delivery, two-year warranty, and 30 days with a full refund and return paid by us if your setup is not supported.

No. Read-only: nothing is ever written to the battery.

No. WeCo Monitor (MoniWatt for WeCo) is an independent accessory designed in France. WeCo is a trademark of its owner.

No, it is plug and play: plug the cable into the RS485 / CAN port of your WeCo battery and USB-C into a phone charger, then join the box’s Wi-Fi from your phone to give it your home network. About a minute, without tools, app or setting changed on the battery. The box arrives prepared for your model.

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

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.

No. The box only reads: the limits, switches and settings of your battery stay exactly as they are.

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.

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

State of charge, voltage, current and power, each cell, temperatures, health and cycles, status and alarms, as the WeCo BMS reports them on its RS485 / CAN port. The exact list depends on the model and firmware: tell us yours when you order.

Every few seconds on the screen and the local dashboard, about every 2 minutes on the free Cloud, which keeps the history.

No. It only sends read requests. Nothing it does can change a setting, a mode or a limit of your equipment.

No. The screen, the local dashboard, Home Assistant and the JSON API work on your home Wi-Fi alone. The internet is only needed for the free Cloud, to see your system from anywhere.

Yes: CSV export from the free Cloud, with up to 3 years of history, and live values at any time through the local JSON API or MQTT.

No. The box talks MQTT, which Home Assistant understands natively, and announces its own sensors (MQTT discovery). Nothing to install on the box, nothing to code.

No: in Home Assistant, Settings › Add-ons › Mosquitto broker › Install, then Start. Home Assistant then offers to configure MQTT: one click. Two minutes, once, and it serves every MQTT device you will ever add.

No. Everything stays on your home network: the box speaks directly to Home Assistant. The free Cloud is a separate option, for seeing your system from anywhere.

Yes. Screen, local dashboard, Home Assistant and Cloud all work together, and none of them changes anything on your battery.

No. All of them read the box directly on your home network, through MQTT or the local JSON API. The Cloud is only for seeing your system from away, or for online services like IFTTT.

On the box’s page, Settings › Access key & Cloud. You can generate a new one at any time; the old one then stops working.

The box keeps the latest reading, refreshed every few seconds. Polling every 30 to 60 seconds is plenty; MQTT pushes each new reading without polling.

No. The box only reads your equipment: no command sent through MQTT or the API can change a setting.

Not natively. IFTTT, Make.com or Apilio can read the private JSON link of the free Cloud and trigger Tuya or SmartLife scenes.

Yes, with no subscription and no paid tier: live dashboard, 3 years of history, CSV export and e-mail alerts are included with the box.

No. You sign in with your e-mail: we send you a one-time link. Your box is linked to your account with its access key.

The screen, the local dashboard and Home Assistant keep working at home. The Cloud picks up again as soon as the connection is back, and can e-mail you if the box stays silent for 6 hours.

Yes. Your installer, or anyone you give the access key to, can link the box to their own account. You can change the key whenever you like.

Untick the option in the box settings and it stops sending at once. Stored readings are deleted on request, with one e-mail.

No. It uses a free RS485 port and only reads. The cluster keeps talking to the inverter exactly as before.

Write to us first: this edition reads low-voltage clusters, and we tell you honestly whether yours can be read.

Pre-orders ship on 10 November 2026. Delivery then takes 2 to 10 days depending on the country; you receive the tracking link by e-mail the day it leaves.

Yes, at any time before dispatch, for any reason: reply to your confirmation e-mail or use the online form. You get 100% back, shipping included.

Return the box within 30 days of delivery: we refund it in full and pay the return shipping.

Payment is handled by Stripe. Your card details never reach our servers, and your bank may ask you to confirm the payment.

Not within the European Union. Elsewhere (United Kingdom, Switzerland, Norway, United States…), import duties and taxes may be charged by the carrier on delivery.

The WeCo app works over Bluetooth or through the maker’s cloud. WeCo Monitor adds a dashboard on your Wi-Fi at home and, through the free Cloud, on any phone or PC anywhere in the world, with three years of history. Nothing to install.

Yes: open http://moniwatt.local in any browser on your network, or the free Cloud dashboard from anywhere. No Windows software, no USB adapter.

Yes. WeCo Monitor reads the battery through its RS485 / CAN port, shows it on its own screen and on your Wi-Fi, and keeps working even without internet.

Enter your MQTT broker in WeCo Monitor: Home Assistant creates every sensor by itself, charge, power, cells, temperatures and alarms. No Bluetooth proxy, no ESP32, no YAML.