Frequently asked questions

Voltary currently offers three dedicated workflows that you can run whether you already have PV or storage installed or are starting from scratch:

• Complete system planning – Design new systems or test if additional PV modules or storage capacity would benefit your existing setup.
• Battery upgrade – Assess how an extra or larger battery performs alongside your current PV system, or explore battery-only scenarios without PV to analyze dynamic price arbitrage.
• Tariff comparison – Simulate your electricity bill under fixed and dynamic tariffs regardless of whether you already have PV and storage or are still comparing options.

Each workflow adapts whether you already run PV and storage or are planning from scratch—choose the one that matches the decision you want to make:

• Optimising or extending an existing setup? Use complete system planning to test additional PV modules or more storage alongside what you already have.
• Focusing on batteries? The battery upgrade flow lets you size new storage for current PV data or explore stand-alone batteries without PV.
• Comparing electricity contracts? Run the tariff comparison to evaluate fixed versus dynamic pricing with or without on-site generation.

Every workflow follows the same structure:

1. Provide input data by uploading measurements, or generating a profile if you have not collected data yet.
2. Configure the scenario with tariffs, hardware choices, and target goals such as ROI or self-sufficiency.
3. Review interactive charts, savings projections, and recommended next actions in the results dashboard.

For the most accurate simulations we recommend hourly consumption and, if available, PV production data.

The upload wizard accepts CSV exports from Home Assistant and other energy portals that include timestamps and consumption in kWh or Wh. During the upload you can map columns and fix units to match Voltary's format.

If you do not have historical measurements you can create a synthetic load profile. Choose your household type, annual demand, working patterns, and large consumers such as EVs or heat pumps. The generator outputs an hourly dataset that feeds directly into every analysis.

Results pages summarise key metrics like annual savings, payback period, self-consumption, and residual grid costs. You can drill into hourly charge and discharge behaviour, review load coverage charts, and inspect how different tariff windows affect economics.

Yes. Adjust battery sizes, tariff structures, and optimisation goals directly in the configuration steps and rerun the simulation. The dashboards update instantly so you can compare ROI, cost savings, or autonomy across scenarios without leaving the flow. After each optimisation you also receive heatmaps that summarise key metrics across alternative configurations.

Charts in the analysis pages can be downloaded as PNG images. After completing an optimisation, you can also export a PDF summary of your results. Generated consumption profiles are available as CSV files from the validation step, so you can reuse them in other tools.

Voltary runs time-series-based simulations across the full analysis period. They are based on real measurements or high-quality synthetic load profiles as well as models for PV generation, battery charging and discharging, grid import, feed-in, and tariff logic. For each configuration, we calculate energy flows, state of charge, self-consumption, grid import, and the resulting costs for every time interval.

For formulas, assumptions, and data sources in more detail, see our Methodology page.

Depending on the workflow, the simulation includes technical and economic parameters. These include, among other things, the consumption profile, PV generation, battery capacity, charge and discharge power, minimum and maximum state of charge, efficiencies, electricity purchase prices, feed-in tariff, analysis period, and assumptions about degradation, price trends, and cost development.

Voltary simulates many configurations systematically and compares them using defined metrics such as savings, self-sufficiency, return, payback period, and grid costs. The recommended results therefore emerge from the interaction of the input data, technical constraints, and the selected optimisation goal.

The results are based on the provided data and the underlying model assumptions. They are a robust basis for decision-making, but they do not replace an on-site technical assessment, an individual installer quote, or legal or tax advice.

For a fuller explanation of model limits and assumptions, see our Methodology page.

No registration is required. All workflows run inside an anonymous session so you can explore the tools without creating an account or sharing contact details.

Uploads are transferred between your browser and our platform over encrypted HTTPS and processed on our servers in the EU in a session-bound workflow. Your uploaded file is stored only temporarily for technical processing and is deleted automatically afterwards.

On pages under app.voltary.de, use the Delete my data action in the footer to clear the current session immediately. This removes uploaded files, generated profiles, and any intermediate results.

If you need assistance beyond the FAQ, reach us through the contact page by email. You can also revisit the guided steps in each workflow at any time—tooltips and in-app hints explain every configuration field.