The battery’s own SOC
Read from the BMS, so it stays right even when the inverter’s estimate drifts.
Read-only · local · Home Assistant ready
Know what your Felicity Solar battery is really doing
Felicity batteries offer a lot of storage for the money. Felicity Monitor adds the one thing they lack: a simple, local way to see inside them from your phone.
- Colour screen + Wi-Fi dashboard
- No cloud, no subscription
- 2-year warranty, 14-day returns
< 1 Wpowered by USB-C
~5 srefresh on your network
3 yearsof optional history
0settings written to your battery
Felicity Solar’s FLB series LiFePO4 batteries are found everywhere from European homes to off-grid installations in Africa and the Middle East, often paired with Felicity or Voltronic-style hybrid inverters. They work well, but what they report usually stops at the inverter display: a percentage and a voltage.
Felicity Monitor reads the battery’s own BMS through its RS485 port. You see the state of charge as the battery calculates it, every cell voltage, temperatures and alarms, on a small screen by the battery and on a dashboard on your home Wi-Fi. Home Assistant gets everything through MQTT. Nothing goes to a cloud unless you decide so, and nothing is ever written to the battery.
What you get
Cell voltages
All sixteen cells with the spread between highest and lowest.
Heat check
Cell and electronics temperatures, important in hot climates and closed rooms.
Alarm log
Each protection event with its time, so you know what happened while you were away.
Phone dashboard
Open it in any browser at home. Optional remote access when you travel.
Home Assistant
MQTT discovery and a JSON API for every other automation tool.
Your solar day at a glance
The chart shows when the battery started charging, when it reached full, how hard the house drew on it in the evening and how much was left at sunrise. In regions with daily power cuts, it shows exactly how many hours the battery bought you.
With the optional remote history you keep three years of data and can export it to a spreadsheet.
Live dashboardLive
SOC82%
Power-416W
Cell Δ12mV
ChargeDischargeState of charge
Up and running in three steps
- PlugThe supplied cable goes into the RS485 port of your Felicity Solar battery; USB-C into any phone charger.
- ConnectJoin the box’s Wi-Fi from your phone, pick your home network and set a password. No app to install.
- WatchOpen the dashboard in any browser, add it to Home Assistant, and set your alerts.
Made for Felicity Solar
| Models | Felicity Solar FLB series 48 V |
|---|---|
| Connection | RS485 port, RJ45 cable included |
| Your existing wiring | Untouched — the box reads, it never writes |
| Network | 2.4 GHz Wi-Fi, works without internet |
| Integrations | Home Assistant (MQTT discovery), JSON API, Node-RED, Jeedom, Domoticz |
| Size | 70 × 70 × 36 mm, 1.8" colour screen |
Another Felicity Solar model? Tell us when you order: your box is prepared and tested for it.
Your data, your way
Everything the box reads is published to Home Assistant through MQTT and available as JSON on your own network. Build dashboards, automations or your own tools, without asking anyone’s cloud for permission.
GET http://felicity-monitor.local/api.json
{
"soc": 72, "voltage": 52.6, "current": -9.8, "power": -515,
"cells": [3.287, 3.290, 3.285, ...], "delta_mv": 8,
"temp": 29.5, "cycles": 143, "alarms": []
}
One cable, one charger
An RJ45 cable from the battery’s RS485 port to the box, a USB charger for power. The box is 70 × 70 × 36 mm with a colour screen.
It shares its design with Pylon-Monitor, which already monitors Pylontech batteries in many homes, and uses an RS485 / CAN board and firmware written for the Felicity BMS.
Designed and assembled in France
Each box is built, flashed and tested in our workshop near Paris before it ships, by the team that makes Pylon-Monitor for Pylontech owners.
Questions before buying? Write to [email protected]: a person answers, usually the same day.
Felicity Monitor
€49.00
VAT not applicable (art. 293 B CGI) · shipping calculated at checkout
- Felicity Monitor with colour screen and RS485 / CAN interface
- RJ45 cable for the battery’s RS485 port
- USB-C cable
Dispatched within 6 weeks · free cancellation until dispatch
A clear view of your Felicity battery
Order now. The box is tested on Felicity batteries before it ships, within six weeks.
Order for €49.00Dispatched within 6 weeks · free cancellation until dispatch