Energy decisions aren't made on monthly averages. They're made on 8,760 hours.
SiteEnergy models what actually happens between your solar array, battery and the grid — hour by hour, from your measured load curve — then finds which investment package genuinely pays for itself.
The problem
Spreadsheet sizing fails in three places
It works on monthly averages
The split between self-consumption and export is decided hour by hour. On monthly averages, solar and battery payback is routinely wrong.
It evaluates upgrades one at a time
A heat pump raises electricity demand, which solar then partly covers. Assessed separately, both numbers come out wrong.
Reporting is a separate job
Regulatory filings and ESG figures get assembled by hand afterwards — even though every input already sits in the calculation.
How it works
Three steps from data to decision
Load your data
Hourly or quarter-hourly consumption from Excel or CSV, inverter logs, meter readings. Weather and solar-yield data are fetched automatically from the site's coordinates.
Hourly calculation
Every hour of a full year: how much goes to self-consumption, how much charges the battery, how much is exported — priced with your actual tariff.
Decide and report
The optimiser finds the best-returning package with NPV and IRR; the report module produces printable regulatory and ESG documentation.
Features
What the system does
Every module works from the same hourly dataset — no separate models, no manual transfer between tools.
Hourly energy flows
Reconstructs the flow between solar, battery and grid from your measured load curve — hour by hour, across a full year, with a monthly chart.
Investment optimisation
From 11 development types — solar, battery, heat pump, insulation, EV fleet, CHP and more — it finds the best combination, with payback, NPV and IRR.
Regulatory reporting
The Hungarian energy-officer annual report (Gov. Decree 122/2015) and the small-scale producer data sheet, filled from the calculation, ready to print.
Energy communities
Links several sites hour by hour with rule-based settlement: how much energy can be shared, and what each member gains from it.
ESG and ISO 50001
Scope 1–2 accounting, energy performance indicators and target tracking — from the same data that drives the sizing.
Four languages, four markets
Hungarian, English, German and Polish interface, with 30 real electricity tariffs from Hungarian, Polish, Austrian and German suppliers.
What it looks like
Not an illustration of the product — the product itself
These are screenshots from the application, showing genuine results for a demo site. Behind every figure sits a full year of hourly dispatch.
Optimiser — cost matrix
451 sizing combinations evaluated. The optimum is 400 kWp of solar with no battery: 6.9-year payback, €22,850 saved per year. The matrix also shows that for this load profile a battery doesn't pay — every battery row costs more.
Printable report
The demo project's report runs to 15 pages: executive summary, economics, sensitivity analysis, technology inventory, CO₂ balance, ESG and ISO 50001 chapters — ready to hand to a client.
The screenshots show a fictional site called Verőfény Ipari Kft. — we do not publish real client data. The load curve is modelled; the weather and solar-yield data come from a real measurement archive, and every result was computed by the application's own engine.
Who it's for
For people who have to stand behind the number
Energy consultants
Sizing you can defend in front of a client — hourly, with payback, not a rule of thumb copied from a table.
Solar installers
A printable analysis alongside the quote: what size is justified, and how long it takes to pay back.
Energy officers
Annual report chapters assembled from measured data, methodology footnotes included.
Industrial operators
Site comparison, energy breakdown by area, ESG accounting and community settlement in one place.
Plans
Three tiers, matched to the depth of your work
Two months free on annual billing. 30% founding discount for the first 10 customers. Full comparison and pricing →
Basic
For straightforward sizing
- Sites and load curves
- Solar and battery
- Hourly energy-flow calculation
- Investment optimisation
- Regulatory reporting
Advanced
For consulting work
- Everything in Basic
- Heat pump, insulation, EV
- Investment optimisation with payback
- System analysis report
- Regulatory and ESG reporting
Complex
Full access
- Everything in Advanced
- CHP, wind, hydrogen, thermal storage
- Regulatory annual report
- ESG and ISO 50001 module
- Energy communities
A free trial will be available at launch, no card required.
Frequently asked
Worth knowing
What data do I need to get started?
The essential input is a measured load curve: an hourly or quarter-hourly Excel or CSV file from your supplier or meter. Weather and solar-yield data are fetched automatically from the site's coordinates.
Does it need installing?
No. It runs in the browser — nothing to install or maintain.
Where is my data stored?
In a Hungarian data centre, within the EU. It is not transferred to third countries. Details are in the privacy notice.
Can I use it for regulatory filing?
Yes. The system follows the format of the Hungarian energy-officer annual report (Gov. Decree 122/2015) and assists with the small-scale producer data sheet. Responsibility for submission and content remains with the energy officer.
What happens to my data if I cancel?
Your data remains exportable for a grace period after cancellation, then it is deleted. The exact period is set out in the terms of service.
Will I get an invoice?
Yes — every payment is invoiced under Hungarian rules, with the required tax authority reporting.
We'll let you know when it goes live
The system is in development. Leave your email and we'll tell you first — no spam, no commitment.