Data tools to forecast, size,
and standardize your solar data.
No credit card, no install, no lock-in. Run a next-day generation forecast, estimate solar ROI on any roof, and normalize inverter data from any OEM with the open-source ODSE standard.
Free tools, ready to use now
Forecast tomorrow’s generation, size a system on any roof, and standardize inverter data from any OEM — all free and open.
24-Hour Solar Forecast
Upload a .csv download from your inverter monitoring portal and get a P50 next-day solar production forecast using localized weather data. Works with any supported OEM file format — no installation needed.
- Upload any supported OEM .csv file
- Immediate forecast — no waiting
- Supports Huawei, Enphase, Solarman, SolarEdge, Fronius, Switch, Lux and more
- Email results delivery
Solar ROI Estimator
A free alternative to Helioscope. Drop a pin anywhere on the map, draw your available roof area, and get an instant system size, cost breakdown, and payback period — all calculated against live TOU tariff data. No login, no credit card, no usage limits.
- Map-based roof area drawing — like Helioscope, in your browser
- Peak sun hours by latitude
- Live TOU tariff rates
- System sizing, panel count & inverter selection
- 25-year financial projection with PDF export
Open Data Schema for Energy (ODSE)
Every OEM speaks a different data language. ODSE is an open specification that standardizes fragmented inverter data from Huawei, SolarEdge, SMA, Enphase, Fronius and more into one validated, interoperable format — so you build one pipeline instead of one per vendor.
- JSON Schema 2020-12 specs for timeseries, assets & maintenance
- YAML transforms for 11+ inverter brands — auto-detected
- Zero-dependency Python reference implementation
- Serialize to JSON, CSV, Parquet or DataFrame
- Independently verifiable — no proprietary lock-in
Supported inverter manufacturers
If your OEM is in the list, we can ingest your data. Auto-detected from .csv file columns — no installation needed.
OEM not listed? Contact us — most can be added within a few days via the open ODSE standard.
Common questions
Are these tools really free?
Yes. The 24-hour forecast and the Solar ROI Estimator are free with no sign-up, no trial, and no seat limits. ODSE is free and open-source under an MIT license — install it, fork it, ship it.
How is the Solar ROI Estimator different from Helioscope?
It covers the core Helioscope workflow — map-based roof drawing, system sizing, production modeling, and a financial projection with PDF export — in your browser, for free, with no account. Helioscope is a paid commercial product; this is a free alternative for quick sizing and ROI estimates against live Eskom TOU tariffs.
What data do I need for the free forecast?
A CSV export from your inverter monitoring portal. We auto-detect the OEM format — Huawei, SolarEdge, Enphase, Solarman, Fronius and more — so there’s no manual configuration. Add your site’s capacity and coordinates and you get a next-day generation forecast in seconds.
What is ODSE and who is it for?
The Open Data Schema for Energy is an open specification that normalizes inverter data from any OEM into one validated format. It’s for asset managers, ESCOs, utilities, and system integrators who are tired of building a separate data pipeline for every vendor. Install with pip install odse.
Which inverter brands does ODSE support?
Production-tested transforms for Huawei FusionSolar, Switch, and Solarman. Demo-ready for Enphase, Fronius, and SMA. Spec-complete for SolarEdge, FIMER, SolaX, SolisCloud, and Higeco. A generic CSV transformer covers anything else — including meters and loggers.
Do I need to install anything to use the forecast or estimator?
No. The forecast and the Solar ROI Estimator run entirely in your browser — just upload a CSV or drop a pin on the map. ODSE is the only tool here that requires an install, and that’s just pip install odse if you want to normalize data programmatically.
Start with a free tool today.
Forecast tomorrow’s generation, size a system on any roof, or standardize your inverter data with the open ODSE standard — all free, no sign-up required.