Practical tools.
Clearer energy decisions.
Explore browser-based calculators and engineering tools designed to make early-stage energy planning easier. Start with Rensys for a preliminary solar PV yield estimate, with more tools for building energy, HVAC, wind and other technologies planned.
Tools for energy planning
Choose an available tool or see what is planned next. Upcoming tools are labelled clearly and are not available to use yet.
Rensys · Solar PV Yield Calculator
Estimate photovoltaic energy production using location and system assumptions. Rensys is designed for fast, preliminary yield screening in your browser.
- Annual and monthly yield estimates
- Location and array configuration inputs
- Free, browser-based access
HVAC Sizing & Load Estimator
A planned tool to help explore preliminary heating and cooling loads and understand the inputs that influence equipment sizing.
- Heating and cooling load screening
- Climate and building inputs
- Guidance for early-stage planning
Wind Energy Estimator
A planned calculator for preliminary wind resource and energy-yield exploration, with site and turbine assumptions made explicit.
- Wind speed and resource inputs
- Turbine performance assumptions
- Indicative annual energy estimates
Building Energy Estimator
A planned early-stage tool for exploring building energy demand, major end uses and potential efficiency opportunities.
- Building use and envelope inputs
- Energy demand screening
- Efficiency scenario comparison
Battery & Storage Planner
A planned tool to explore battery capacity, usable energy and how storage may complement a renewable energy system.
- Load and usage assumptions
- Storage capacity scenarios
- Preliminary system comparisons
EV Charging Load Planner
A planned estimator for exploring charging demand, charging schedules and the potential electrical load of EV charging installations.
- Vehicle and charging assumptions
- Energy demand estimates
- Preliminary load planning
Important: Coming-soon items describe planned tools, not released products. Preliminary calculator outputs are not a substitute for site-specific engineering, code compliance checks or professional design.
Tools that make assumptions visible
A useful estimate should help you understand the problem:not hide the assumptions behind a single number.
Designed for early-stage decisions
Renwaves tools aim to make common energy calculations easier to explore, with focused inputs and outputs that support initial feasibility checks and informed questions.
- Clear input and output descriptions
- Practical workflows for common energy questions
- Links to relevant documentation where available
Know the limits of an estimate
Results depend on input quality, data sources, model assumptions and real site conditions. A quick calculator is a starting point, not a certification.
- Check assumptions before comparing results
- Use qualified review for consequential decisions
- Request project-specific design when required
How to use Renwaves tools
Start broad, refine your assumptions, and bring in engineering support when the decision requires it.
Choose a tool
Select the calculator that matches your question. Rensys is available now for preliminary solar PV yield estimates.
Review your inputs
Enter realistic location, equipment and system assumptions. Read the tool documentation and note any unavailable details.
Use results responsibly
Treat outputs as estimates. For permitting, procurement, financing or construction, confirm the requirements and obtain appropriate professional review.
Questions about our tools
A few details to help you choose the right starting point.
Which tools are available now?
Rensys, the solar PV yield calculator, is available now. HVAC, wind, building energy, battery storage and EV charging tools are listed as planned and are not yet available.
Are the tools free to use?
Rensys is presented as a free tool. Availability and access terms for future tools will be stated when they are released.
Can I use calculator results for a permit or financing application?
Do not rely on a preliminary estimate alone. Requirements vary by project and authority; consult a qualified engineer and use the analysis required for your specific decision.
Can Renwaves help with a complete project?
Yes. If your project needs detailed calculations or engineering design, visit our Services page or request expert advice.
Need more than a quick estimate?
Explore Renwaves engineering services for project-specific calculations, simulation and renewable system design.