Free solar tools: Wattuneed calculators and simulators

Are you considering a photovoltaic system but unsure about sizing, profitability, or technical aspects? Wattuneed offers a complete suite of free solar tools to support you at every stage of your project. Whether you're an individual, a professional installer, or a business, our calculators and simulators help you make the right decisions.

Why use our solar calculation tools?

Investing in photovoltaics represents a significant financial commitment. To maximize your return on investment and avoid costly mistakes, it is essential to correctly size your installation. Our professional tools allow you to:

• Accurately estimate your solar production based on your region
• Calculate the profitability of your battery investment
• Size your cables to avoid voltage drops
• Optimize your self-consumption and reduce your bills
• Get a personalized quote tailored to your specific needs

"Thanks to the Wattuneed solar simulator, I was able to size my system in 10 minutes and get an accurate projection of my savings over 25 years. An invaluable time saver!" – Jean-Marc, Wattuneed customer

Our simulation and sizing tools

Advanced solar simulator: your project in just a few clicks

Our free solar simulator is the most comprehensive tool for assessing the potential of your photovoltaic system. In just a few minutes, get a detailed analysis including:

The simulator takes into account Belgian specificities: prosumer tariff, green certificates, regional bonus, and guides you towards the optimal configuration.

🚀 Launch my free simulation

Sizing guide: the professional methodology

For those who wish to fully understand the sizing of a photovoltaic system , our comprehensive guide will walk you through it step by step. You will discover how to:

1. Calculate your annual electricity consumption and identify energy-intensive appliances.
2. Determine the required power in kWp based on your consumption profile
3. Optimize the orientation and tilt of your solar panels
4. Choose the appropriate components : inverter, battery, regulator
5. Anticipate the evolution of your needs (electric vehicle, heat pump)

📘 Consult the complete guide

Professional technical calculators

Voltage drop calculator: zero energy loss

Voltage drops in cables can significantly reduce the performance of your solar installation. Our professional calculator allows you to precisely size your electrical cables to guarantee optimal efficiency.

Advanced features:

• Multi-configuration of circuits (DC and AC)
• Calculation according to standard NF C 15-100
• Taking ambient temperature into account
• Cable cross-section recommendations
• Calculation of losses as a percentage and in watts

A voltage drop exceeding 3% can lead to significant production losses. Use our tool to select the appropriate cable cross-section that complies with applicable standards.

⚡ Calculate my cable cross-section

Battery profitability calculator: Invest wisely

Is adding a storage battery to your photovoltaic system profitable? Our calculator will give you the answer by analyzing your personal situation.

"In Belgium, with the prosumer tariff and current electricity prices, storing your surplus can be more advantageous than feeding it back into the grid. Our calculator helps you make the right decision." – Wattuneed Technical Team

The calculator generates a detailed amortization schedule and indicates the return on investment period. This allows you to compare several battery capacity scenarios.

💰 Analyze the profitability of my battery

Personalized services and expert support

Custom quote module: create your tailor-made project

Our interactive quote tool allows you to design your own installation by freely choosing each component. You benefit from:

• Production simulation based on your location
• Consumption analysis to determine the most appropriate sizing
• Amortization schedule with projection over 25 years
• Free choice of equipment from our premium catalog
• Transparent pricing with a breakdown of each component

This tool is particularly appreciated by self-installers and professionals who want to control every aspect of their project.

🛠️ Create my personalized quote

Quotes from our experts: tailored support

Would you prefer to be guided by professionals? Request a personalized technical and commercial study conducted by our team of experts. This free service includes:

• In-depth analysis of your energy situation
• Recommendations for equipment that fits your budget
• Optimizing the configuration to maximize your profitability
• Advice on administrative procedures (Brugel, network manager)
• Detailed quote with guarantees and services included

Our experience of more than 10 years in photovoltaics in Belgium allows us to offer you proven solutions perfectly adapted to the Belgian regulatory context.

📞 Request my free expert quote

Technical resources and assembly diagrams

Electrical schematics library

For experienced installers and DIY enthusiasts, Wattuneed offers a comprehensive library of technical diagrams . You'll find detailed plans for:

All our diagrams comply with Belgian (RGIE) and European (NF C 15-100) electrical standards . They include recommended cable cross-sections, mandatory protections, and points of attention for a safe installation.

📐 View technical diagrams

How can we use our tools effectively?

To get the most out of our solar toolkit , we recommend following this step-by-step approach:

1. Start with the simulator to get an initial overall estimate
2. Consult the sizing guide to understand the technical issues.
3. Use the battery profitability calculator if you are considering storage.
4. Validate the cable sizing with our voltage drop calculator
5. Create your personalized quote or contact our experts for assistance.
6. Download the technical diagrams corresponding to your configuration

"Wattuneed's strength lies in offering professional tools accessible to everyone. Even without advanced technical knowledge, I was able to confidently size my installation." – Sophie, Liège

The advantages of Wattuneed tools

Reliability and precision

All our calculators use proven algorithms and real meteorological data. Production simulations are based on sunshine data from the Royal Meteorological Institute of Belgium (IRM) to ensure realistic estimates.

Regulatory compliance

Our tools incorporate the specificities of the Belgian market: prosumer tariff , compensation mechanism, green certificates, regional subsidies (Wallonia, Brussels, Flanders). This gives you a precise view of the actual profitability in your region.

Regularly updated

The photovoltaic sector is evolving rapidly: new tariffs, new technologies, and changing regulations. Our tools are regularly updated to reflect current market conditions.

Free and without obligation

All our tools are completely free to use. You can run as many simulations as you like, without creating an account and without any obligation to purchase.

Additional support

Beyond online tools, Wattuneed offers personalized support at every stage:

• Responsive customer service : Mon-Fri 8:30am-5:00pm by phone, email or chat
• Technical expertise : Advice on hardware selection and configuration
• After-sales support : Assistance with installation and troubleshooting
• Blog and guides : Educational resources to deepen your knowledge

Our goal is to democratize solar energy by making it accessible, understandable and profitable for everyone.

Frequently asked questions about our tools

Are Wattuneed tools suitable for the Belgian market?

Yes, absolutely. All our calculators and simulators are specifically designed for the Belgian context. They take into account local sunshine data, the prosumer tariff , compensation mechanisms, and the regulatory specificities of the three regions (Wallonia, Brussels, Flanders). The electricity prices and feed-in tariffs used correspond to Belgian market values.

Do I need to create an account to use the tools?

No, most of our tools are accessible without creating an account. Only the custom quote module requires free registration to save your settings and receive quotes by email. This registration also allows you to track your project's progress and modify it at any time.

Are the simulations reliable?

Our simulations are based on real data and proven algorithms . However, these are estimates that can vary depending on several factors: actual shading, precise orientation, effective panel performance, and price fluctuations. We apply a safety margin to ensure realism. For a precise analysis, we recommend requesting a personalized quote from our experts.

Can I use these tools for a professional installation?

Yes, our tools are used by both individuals and professional installers . The voltage drop calculator and technical diagrams are particularly valued by professionals for their accuracy and compliance with standards. For large-scale projects (over 10 kWp), we recommend contacting our sales team for dedicated support.

How are the savings calculated in the simulator?

The simulator calculates your savings by comparing your current situation (total purchase from the grid) with your future situation (self-consumption + feed-in). It takes into account: the cost of purchasing electricity, the feed-in tariff, any applicable prosumer tariff , estimated energy inflation, and the gradual degradation of the panels (0.5% per year). The amortization schedule shows you the year-by-year evolution.

What is the difference between the simulator and the quote module?

The solar simulator quickly provides an estimate of production and savings for a typical configuration. The personalized quote module goes further: it allows you to precisely choose each component (panel brand and model, inverter, battery), obtain a detailed price, and generate a complete payback schedule. It's the ideal tool if you already know which equipment you're interested in.

Ready to start your solar project?
Use our free tools now and discover the potential of your photovoltaic installation.

🧰 Access all Wattuneed tools

Wattuneed SPRL – Your trusted partner for solar energy in Belgium
Photovoltaic expertise since 2012 | Premium equipment | Dedicated customer service | Free delivery on orders over €3000*