Solar · Battery · Heat pump · EV charger
The honest number behind your system.
Enermoni recalculates self-consumption, self-sufficiency and battery losses independently of any manufacturer, with your grid meter as the reference. And it tells you when something stops working.
Every app does its own maths
Inverter, battery, heat pump and EV charger often come from different manufacturers. Each app shows its own view, and none of them has to match what your grid meter measures.
Calculated from their own sensors
Vendor apps usually work with readings from their own devices. What your grid meter counts, the energy you pay for and get paid for, often plays no part.
Losses are left out
Battery charge and discharge losses and the inverter’s own consumption are missing from many displays. Self-sufficiency then looks better than it is.
No overall balance
With devices from several manufacturers there is no single place where everything comes together. What your system really delivers remains a guess.
Outages go unnoticed
A string that dropped out, a battery that no longer charges, an inverter that lost its connection: often nobody notices for weeks.
What Enermoni does
One balance across all devices, independent of the manufacturer, with every calculation traceable.
Energy balance
Self-consumption, self-sufficiency, battery losses and savings, calculated from measurements. The grid meter is the reference, and deviations from device readings are shown.
Diagnostics
Rules detect typical faults, such as a battery that does not charge despite surplus solar, or a heat pump that cycles too often.
Outage alerts
If a system stops sending data or produces clearly less than expected, you get a message.
Vendor-independent
Solar, battery, heat pump and EV charger in one balance. At launch, Fronius and Victron systems are connected directly, without Home Assistant; more manufacturers will follow.
The maths, out in the open
No number without a derivation: every figure in Enermoni follows from measurements. These are the basic formulas, each calculated over the same period.
Household consumption
Consumption = grid import + solar generation − grid export − battery charge + battery dischargeGrid import and export come from the grid meter. What the house consumed follows from the energy balance, not from an estimate.
Self-consumption rate
Self-consumption rate = (solar generation − grid export) ÷ solar generationThe share of solar energy that stayed in the house or in the battery.
Self-sufficiency
Self-sufficiency = (consumption − grid import) ÷ consumptionThe share of consumption covered without energy from the grid.
Battery losses
Battery loss = battery charge − battery discharge − increase in stored energyThe energy lost while charging, discharging and on standby.
The full derivation including special cases (charging the battery from the grid, the inverter’s own consumption, missing readings) will be published on the page “How Enermoni calculates”.
Your measurements stay yours
- Hosted in the EU, on servers in Germany.
- Your measurements are not passed on to third parties, including manufacturers.
- On request, your data is deleted completely.
- Advertising is always marked as such and never affects any number shown.
Interested? Get in touch!
Enermoni is in development, and I am glad about every message: a question, a manufacturer you would like to see supported, interest in testing, or just a quick “sounds good”. Reach me whichever way suits you best. I reply personally.
Julian Haag, Haag Automation
The waitlist with email confirmation opens soon. Those who get in touch now will be the first to try it.
Frequently asked questions
Does Enermoni replace my manufacturer’s app?
No. The manufacturer’s app remains the place for device settings. Enermoni adds an independent balance across all devices and monitoring that reports outages.
Which devices are supported?
At launch, Fronius and Victron systems, connected directly without Home Assistant. More manufacturers and a Home Assistant integration will be added step by step.
Why the grid meter as the reference?
The grid meter measures what gets billed: grid import and export. If device readings differ from it, Enermoni shows the difference instead of hiding it.
Where is my data stored?
In the EU, on servers in Germany. Measurements are not passed on and are deleted completely on request.