Home / Specifications
BSLBATT Monitor: technical specifications
Everything about the box, its software and the free Cloud, on one page, for your BSLBATT battery.
A BSLBATT battery comes with a long warranty, and long warranties come with conditions: how the battery was charged, at what temperature, how deep it was discharged. Very few owners can show any of that years later. The box keeps a record without you thinking about it: charge, cells, temperatures and alarms, every few seconds, with up to three years of history in the free Cloud.
It reads the battery over its RS485 communication port. The CAN link to your inverter keeps doing its job, the box never writes anything.
The box
| Screen | 1.8" colour screen: charge, power and the box’s address on your network |
|---|---|
| Size | 70 × 70 × 36 mm |
| Power | USB-C, 5 V, under 0.5 W: any phone charger or a power bank |
| Connection | CAN / RS485 port, RJ45 cable included |
| Network | 2.4 GHz Wi-Fi (no Ethernet port); a small router without internet is enough at home |
| Mode | Read-only: the box never changes a setting of your battery |
| After a power cut | Restarts on its own and picks up where it left off |
Local software
| Setup | The box opens its own Wi-Fi network on first start: pick your home network from your phone. No app, no account. |
|---|---|
| Local dashboard | http://moniwatt.local in any browser, password-protected, works without internet |
| JSON API | GET /api.json on your network, protected by a key |
| MQTT | Readings published on your broker, Home Assistant auto-discovery (no YAML) |
| Other platforms | Jeedom, Node-RED, Domoticz, openHAB |
Free Cloud (optional)
| Access | Live dashboard on any phone or PC, from anywhere, no port forwarding or VPN |
|---|---|
| History | Up to 3 years, CSV export |
| Alerts | E-mail if the box goes quiet for 6 hours; thresholds for charge, temperature and alarms |
| Sharing | Private JSON link; an installer can follow the system with their own access |
| Privacy | Off by default, encrypted (HTTPS), switched off in one click in the box settings |
| Price | Free, no subscription |
Compatibility
| Models | BSLBATT 48 V rack and wall batteries |
|---|---|
| Port on the battery | RS485 communication port, RJ45 |
| Inverter link | CAN link left as it is |
| Records | History up to 3 years, CSV export |
| Your existing wiring | Untouched: the box reads, it never writes |
| Another model? | Tell us when you order: your box is prepared and tested for it. |
Order and service
| Price | €49.00 · Pre-order price · €59 from 10 Nov |
|---|---|
| Dispatch | Pre-order: ships from France on 10 November 2026. |
| Delivery | 38 countries in Europe, North Africa, North America, Australia and Japan; shipping shown before payment |
| Returns | 14 days after delivery; 30 days and return paid by us if your model is not supported |
| Warranty | 2 years |
| Support | By e-mail, from the team that makes Pylon-Monitor, in English, French, German, Dutch, Spanish and Italian |
Keep reading
Give your BSLBATT system a second pair of eyes
Order BSLBATT Monitor. Ships on 10 November 2026, tested on BSLBATT batteries.
Pre-order for €49Pre-order price · €59 from 10 Nov · ships on 10 November 2026 · free cancellation until dispatch