What the panels produce
PV voltage and power right now, and the solar energy of the day.
Pre-order · ships on 10 November 2026
The missing remote display for your Suntaic inverter
Suntaic Hero and Rack inverters come without a supervision dongle. MoniWatt for Suntaic plugs into their RS232 port and puts every figure from the inverter screen on your phone.
- Colour screen + Wi-Fi dashboard
- No subscription
- 14-day returns, 2-year legal guarantee
< 0.5 Wpowered by USB-C
0settings written to your inverter
€49.00screen and cables included
10 Novpre-orders ship
Suntaic Hero and Rack inverters, such as the 5500 W 48 V model found in many solar kits in Spain, Portugal and France, have a clear front display. You scroll through PV power, battery voltage, grid voltage, output, the split between battery charging and house consumption. The catch: you have to be standing in front of it, and nothing is recorded.
The idea for MoniWatt for Suntaic came from a Suntaic owner who asked us exactly this: could the box we make for Pylontech batteries read his inverter too? The answer is yes. MoniWatt for Suntaic connects to the free RS232 port of the inverter (the RS485 port stays with your battery), and shows the inverter’s data on its own screen, on a dashboard on your phone, and in Home Assistant. It never changes a setting.
What you get
Where the energy goes
Battery charging versus house consumption, as the inverter splits it.
Grid and output
Grid voltage and frequency, output voltage, load power and percentage.
Battery side
Battery voltage, charge and discharge current, level as the inverter sees it.
Second-home friendly
With the optional remote dashboard, check your holiday home’s solar from abroad, with an alert if it stops reporting.
Home Assistant
MQTT discovery and a local JSON API for your automations.
A day of sun, recorded at last
The inverter screen shows the present moment. The dashboard shows the whole day: the morning ramp of the panels, the midday plateau when the battery is full and power is left unused, the evening draw on the battery. After a week you know whether your kit is well balanced between panels, battery and consumption.
Turn on the remote dashboard to keep up to three years of history and follow the installation when you are away.
Live dashboardLive
Solar3.48kW
Load1.21kW
Battery53.1V
SolarLoadState of charge
Up and running in three steps
- PlugThe supplied cable goes into the RS232 port of your Suntaic inverter; 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 Suntaic
| Models | Suntaic Hero and Rack ranges (5500 W 48 V…) |
|---|---|
| Connection | RS232 port, RJ45 cable included |
| Your existing wiring | Untouched — the box reads, it never writes |
| Network | Your home Wi-Fi (2.4 GHz) |
| Integrations | Home Assistant (MQTT auto-discovery), Jeedom, Node-RED, Domoticz |
| Power | USB-C, under 0.5 W |
Another Suntaic model? Tell us when you order: your box is prepared and tested for it.
Your data, your way
The values the box reads can go into Home Assistant, where you build your own dashboards and automations. Here is what a reading looks like.
GET http://moniwatt.local/api.json
{"mode": "Grid", "pv_w": 3180, "pv_v": 288.0,
"load_w": 1240, "out_v": 230.1, "grid_v": 232.4,
"batt_v": 54.2, "batt_chg_a": 31, "batt_dis_a": 0,
"pv_kwh_today": 14.6, "warnings": []}
Uses the free RS232 port
Suntaic Hero and Rack inverters have an RS485 port, used to talk to the battery, and an RS232 port that is usually free. The box connects to the RS232 port with the supplied RJ45 cable and is powered by any USB charger., with a colour screen.
It is the same hardware as Pylon-Monitor, which already communicates over RS232 with Pylontech batteries. The firmware for Suntaic is adapted to the inverter’s serial 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.
MoniWatt for Suntaic
€49.00
VAT not applicable (art. 293 B CGI) · shipping calculated at checkout
- MoniWatt for Suntaic with colour screen
- RS232 cable for the inverter
- USB-C cable
Ships on 10 November 2026 · free cancellation until dispatch
Check your Suntaic system from anywhere
Order MoniWatt for Suntaic. Ships on 10 November 2026, tested on a Suntaic inverter.
Pre-order for €49.00Ships on 10 November 2026 · free cancellation until dispatch