Deye and generator power monitor: see what powers your home
Small displays in your rooms show where the power is coming from right now: the grid, the battery or the generator. Battery charge, time left, generator load and the fuel in the tank. When something changes, you get a Telegram message.
SDS · Power monitorGrid power came back at 21:10. The outage lasted 2 h 28 min; the battery supplied 3.4 kWh and is now charging.
What you get
No guesswork during an outage
Source
See the power source at a glance
Grid, battery or generator, shown with a coloured ring. No trips to the panel and no need to open the inverter app.
Battery
Charge and time left
Charge level, charge or discharge power and how many hours the battery will last at the current load.
Load
A warning before overload
The display shows inverter and generator load in percent. When it gets close to the limit, it lights up, a hint not to run the water heater and the oven at the same time.
Generator
Fuel, run hours, service
Tank level, run hours and a reminder to change the oil on the manufacturer's schedule.
Telegram
Alerts for what matters
Power lost and restored, low battery, generator start, low fuel, overload. The whole family in one chat.
Automation
Heavy loads switch off by themselves
When the battery runs low or the inverter or generator nears overload, the water heater, air conditioner and underfloor heating switch off automatically, and back on when grid power returns.
History
How long the outages lasted
Duration of each outage, how much energy the battery supplied and how many hours the generator ran.
Display options
Build your display from the options you need
Turn on the options you need and see how the displays change. The basics — power source, battery and load — are always there when we read data from the inverter.
Tap an option to turn it on or off — the displays will change.
Battery64%≈5 h · 1.4 kW
Round 1.28″
SourceBattery
Battery64%
Time left≈5 h
Load1.4 kW
Generatoroff
Square 4″
SourceBattery
Battery64%
Time left≈5 h
Load1.4 kW
Generatoroff
Panel 7″
Generator
Adds: generator status and load in percent, with an overload warning
Needs: on Deye, the inverter GEN port; if the generator feeds the inverter input through a transfer switch, a Shelly EM meter on the grid feed
Fuel and run hours
Adds: fuel level, approximate hours left, a run-hour counter and service reminders
Needs: a fuel level sensor in the tank (float or capacitive) and a cable to the gateway
Solar panels
Adds: current solar output and the day’s yield
Needs: nothing extra if the panels are connected to the hybrid inverter
3 phases
Adds: the load on each phase, so no single phase gets overloaded
Needs: a three-phase inverter or a Shelly Pro 3EM meter (with a single-phase inverter only one phase is powered during an outage)
Load shedding
Adds: the water heater, air conditioner, underfloor heating and other heavy loads switch off automatically when the battery drops below a set level or the inverter or generator nears overload, and switch back on when grid power returns
Needs: smart relays or contactors on those circuits in the board, plus rules in the gateway or Home Assistant
No inverter
Adds: just “grid or generator”, voltage on both feeds and generator load — for a house with a generator and a transfer switch but no battery
Needs: a meter on each feed: a Shelly EM on the grid feed and one on the generator feed (Shelly Pro 3EM for three phases)
Without an inverter there is no battery, so the battery and time-left tiles disappear.
How it works
We read the inverter without cutting a single wire
We install the SDS gateway, an industrial DIN-rail controller with RS485, in your distribution board. It reads data from the Deye inverter through a separate RS485 (Modbus) port, which most hybrid models have, in read-only mode: it never changes inverter settings, and the Deye Wi-Fi logger and app keep working as before. We check the port against your inverter model. The displays refresh every 2–3 seconds. If the link drops for more than a few seconds, the display says so instead of showing an old number.
power linesinverter datasensor and gateway signals
The gateway, router and displays must run from the inverter output, otherwise they go dark with the lights during an outage. If the generator is connected through a transfer switch to the grid input rather than to the GEN port, we add a Shelly EM meter on the grid feed (a Shelly Pro 3EM for three phases), so the display knows the grid is back even before the switch-over. In a metal distribution board the gateway gets an external antenna.
Generator under control
Fuel and run hours without walking to the tank
Fuel level
A sensor in the generator tank or a separate tank
We pick the sensor type for your tank: float or capacitive; for petrol generators a separate fuel tank is sometimes easier. Percent and approximate litres on the display, with alerts at 30% and 15% and an estimate of how many hours are left at the current load.
Run hours
Counted automatically
The gateway sees when the generator is producing voltage and keeps a counter. It may differ slightly from the generator's own hour meter. You get a reminder before the oil change is due.
Auto start
The generator starts on its own
Deye starts the generator when the battery drops to a set level and stops it once the battery is charged. This needs a generator with an electric starter and two-wire remote start, or an auto-start module. The monitor logs every start, the battery charge at that moment and the run time.
Load
No generator overload
Generator load as a percent of its rated power. When it gets close to the limit, the display shows a warning.
We give an exact price after a site survey. A site visit costs from 1,500 UAH in Kyiv and from 2,000 UAH in Kyiv Oblast; this amount is credited toward the job.
Deye and generator monitoring FAQ
Will it work if I don't have a Deye?
This page covers Deye because it is the inverter we install most. Other hybrid inverters with an RS485 (Modbus) port can be read too, but the data available depends on the model. Send us the model and we will tell you what you will see.
Could the gateway change my inverter settings?
No. The gateway only reads inverter registers and never writes to it. The Deye Wi-Fi logger and app keep working as before.
Do the displays work without internet?
Yes. The gateway sends the status to the displays directly; internet is only needed for Telegram. Just make sure the gateway, displays and router run from the inverter.
Can I use it without a generator?
Yes. The display then shows the grid and the battery, and the generator section is hidden. A fuel sensor and run-hour tracking can be added later.
How accurate is the time-left estimate?
It is accurate for lithium batteries that report BMS data to the inverter. With lead-acid batteries the charge is estimated from voltage, so the estimate is rough.
How much does it cost?
It depends on the number of displays and whether you need a fuel sensor. We give an exact price after a site survey. A site visit costs from 1,500 UAH in Kyiv and from 2,000 UAH in Kyiv Oblast; this amount is credited toward the job.