Professional Solar & Storage
Simulation & Consulting
GreenWatt Consulting is South Africa's purpose-built solar PV and battery energy storage system (BESS) simulation platform. Unlike international tools that lack local context, GreenWatt natively models Eskom TOU tariffs (Megaflex, Miniflex, Ruraflex, Municflex, Nightsave) and also allows for Custom Tariff configurations, load shedding stages 1–8 with pre-charge battery scheduling, peak demand shaving, diesel generator backup, and produces financial projections including ROI, IRR, NPV, LCOE, and payback period — all in South African Rand. Import Helioscope or PVSyst solar data, compare PPA vs lease vs outright purchase, and generate professional custom reports. Start your free 14-day trial at greenwattconsulting.co.za.
Two Ways to Work With Us
Choose the approach that fits your needs — from self-service modelling to full consultancy support.
Self-Service Platform
Perfect for Engineering & EPC companies who want to run their own simulations. Our powerful modelling platform gives you complete control over system design, with all the tools you need to deliver professional feasibility studies and investment analysis.
- Full access to simulation engine and financial modelling
- Upload load profiles and Helioscope / PVSyst data
- Generate professional Excel reports for clients
- Collaborate with team members on projects
Professional Consulting
For organizations seeking expert advisory, our Professional Engineering team delivers comprehensive feasibility studies and system design recommendations. We handle the technical complexity so you can focus on decision-making.
- System sizing optimization for solar PV and BESS
- Technical feasibility studies with detailed modelling
- Financial analysis and investment case preparation
- Tariff structure optimization and grid connection
- Load shedding resilience planning
- PPA and lease structure advisory
Everything You Need for Professional Analysis
Our simulation platform handles the full complexity of solar and BESS projects with South African conditions in mind.
Interactive Energy Flow Diagram
Comprehensive Feature Set
Purpose-built for South African conditions with full support for Eskom tariffs, load shedding, and local regulatory requirements.
Solar PV Modelling
Import Helioscope or PVSyst simulation data, or configure PV systems with degradation rates, orientation, and annual generation profiles. Scale systems dynamically.
BESS Optimization
Advanced battery dispatch with TOU arbitrage, peak shaving, watchdog charging, and SOC management. Configure charge/discharge rates and depth of discharge.
Load Profile Analysis
Upload actual hourly data (CSV/Excel) or generate profiles from TOU patterns. Supports weekday/weekend/holiday variations with kW and kVA tracking.
Load Shedding Resilience
Model battery backup during Eskom load shedding stages 1-8. Pre-charge scheduling ensures SOC targets are met before scheduled outages.
Peak Demand Management
Peak shaving threshold optimization to reduce demand charges. Watchdog mode protects against TOU peak periods with configurable lead times.
Grid Tariff Structures
Complete support for Eskom TOU tariffs (Megaflex, Miniflex, Ruraflex), municipal rates, demand charges, network access fees, and feed-in tariffs.
Financial Analysis
Comprehensive 25-year cashflow projections with NPV, IRR, ROI, LCOE, and payback period. Model financing options, PPA/lease structures, and escalation rates.
Excel Reports
Export detailed reports with all inputs, energy flows, financial metrics, hourly data, and charts. Perfect for client presentations and due diligence.
Project Collaboration
Share projects with team members with view or edit permissions. Perfect for engineering teams and client reviews.
MPC Optimizer
Linear Programming based Model Predictive Control — solves 8,760 hourly LP problems to find the globally optimal BESS dispatch for peak shaving, energy arbitrage, and curtailment management.
Sensitivity Analysis
Multi-variable what-if scenarios — sweep battery size, tariff escalations, PV capacity, and other key parameters to understand how project economics respond to uncertainty.
Eskom DDPM
Eskom Demand Distribution Management Programme — model compensation for reducing grid demand during evening peak hours. Calculates quarterly payments over a 24-month sustainability term based on contracted MW, average kW reduction during DDPM windows, and pro-rata performance.
PPA & Lease Modelling
Compare financing structures — Power Purchase Agreement (PPA), lease, and outright purchase side by side. Model escalation rates, contract terms, and true cost of energy to help clients choose the optimal financing path.
Yield Performance Guarantee
PV exceedance probability analysis (P50, P90, P99), availability factor modelling, and guaranteed yield compensation tables. Use performance guarantee values to run conservative simulations based on bankable yield estimates.
Tariff Change Analysis
Model the financial impact of upcoming tariff changes — compare current vs. new rate structures side by side. Evaluate how TOU shifts, demand charge adjustments, and escalation changes affect project economics before they take effect.
Off-Grid Feasibility
Assess the viability of full grid disconnection — model standalone solar + BESS systems with diesel backup, evaluate autonomy days, unserved energy risk, and compare the total cost of off-grid supply against continued grid dependence.
Eskom Offset & Banking
Model Eskom's SSEG offset and banking mechanisms — excess solar export offsets import consumption within TOU periods each month, with surplus credits banked from April through March. Automatically disables feed-in tariffs when active.
Ready to Start Your Analysis?
Join engineering teams across South Africa who trust GreenWatt for their solar and BESS feasibility studies.
Try it free for 14 days — no credit card required.
Terms & Conditions
1. Platform Usage
The GreenWatt Consulting platform is provided as a professional engineering analysis tool for solar photovoltaic (PV) and battery energy storage system (BESS) feasibility studies. By creating an account and using this platform, you agree to use it solely for lawful purposes and in accordance with these terms. Access is granted on a per-user subscription basis, and account credentials may not be shared with or transferred to third parties.
2. Simulation Results & Disclaimer
All simulation outputs, financial projections, energy yield estimates, and reports generated by this platform are intended for preliminary feasibility assessment only. Results are based on the input data, assumptions, and mathematical models applied, and should not be construed as guaranteed performance or financial returns. GreenWatt Consulting (Pty) Ltd does not warrant the accuracy, completeness, or suitability of the simulation results for any particular investment decision. Users are advised to engage qualified professionals for detailed engineering design and independent financial due diligence before committing to any capital expenditure.
3. Data Privacy & Confidentiality
Project data, load profiles, and uploaded files are stored securely and are accessible only to the account holder and any users with whom the project has been explicitly shared. GreenWatt Consulting will not disclose, sell, or share your project data with third parties without your express written consent. We implement industry-standard encryption and access controls to protect your information. You retain full ownership of all data you upload to the platform.
4. Intellectual Property
All platform software, algorithms, simulation models, user interface designs, branding, and documentation are the intellectual property of GreenWatt Consulting (Pty) Ltd. Reports and analysis outputs generated for your projects may be freely used, distributed, and presented by you for business purposes. However, the underlying platform technology, methodology, and proprietary calculation engines may not be reverse-engineered, reproduced, or redistributed.
5. Subscription & Payment
Subscriptions are billed on a monthly basis as per the pricing plan selected. All fees are quoted in South African Rand (ZAR) and are payable in advance. GreenWatt Consulting reserves the right to adjust subscription pricing with 30 days' written notice. Failure to maintain an active subscription may result in restricted access to projects and reports, though your data will be retained for a minimum of 90 days following account deactivation.
6. Limitation of Liability
To the maximum extent permitted by South African law, GreenWatt Consulting (Pty) Ltd shall not be liable for any indirect, incidental, consequential, or special damages arising from the use of this platform, including but not limited to loss of profits, business interruption, or loss of data. Our total liability in connection with these terms shall not exceed the fees paid by you in the twelve (12) months preceding the claim.
7. Governing Law
These terms are governed by and construed in accordance with the laws of the Republic of South Africa. Any disputes arising in connection with these terms shall be subject to the exclusive jurisdiction of the courts of the Republic of South Africa.
Last updated: March 2026. GreenWatt Consulting (Pty) Ltd reserves the right to update these terms at any time. Continued use of the platform constitutes acceptance of the revised terms.