Professional Solar & Storage
Simulation Platform
GreenWatt is a professional solar PV and battery energy storage system (BESS) simulation platform built for energy consultants worldwide. Model any time-of-use tariff structure, grid outage scenarios with pre-charge battery scheduling, peak demand shaving, diesel generator backup, and produce financial projections including ROI, IRR, NPV, LCOE, and payback period in multiple currencies. Import Helioscope or PVSyst solar data, compare PPA vs lease vs outright purchase, and generate professional custom reports. Start your free 14-day trial today.
How It Works
A self-service simulation platform for energy professionals — design, model, and finance solar & BESS projects all in one place.
Self-Service Simulation Platform
Built for EPC contractors, energy consultants, and project developers who want full control. Design and simulate solar PV and BESS systems with engineering-grade modelling, comprehensive financial analysis, and professional reporting — all at your fingertips.
- 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
IPP, Bank & Funding Partners
Submit your projects for PPA and financing offers directly through the platform. Independent Power Producers (IPPs), banks, and funding partners will be able to review anonymised project data, submit competitive term sheets, and engage with EPC contractors — all within GreenWatt's secure marketplace.
- Request PPA and financing offers from vetted funding partners
- Anonymised project data protects client confidentiality
- Compare term sheets side-by-side from multiple providers
- Secure NCA workflow before full project details are disclosed
Everything You Need for Professional Analysis
Professional-grade tools for energy consultants worldwide — flexible tariff modelling, grid outage resilience, and comprehensive financial analysis.
Interactive Energy Flow Diagram
Comprehensive Feature Set
Professional-grade tools for energy consultants worldwide — flexible tariff modelling, grid outage resilience, and comprehensive financial analysis.
Solar PV Modelling
Import Helioscope, PVSyst, or PVSol 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.
Grid Outage Resilience
Model battery backup during scheduled or unscheduled grid outages. Pre-charge scheduling ensures battery state-of-charge targets are met before outage periods.
Peak Demand Management
Peak shaving threshold optimization to reduce demand charges. Watchdog mode protects against peak periods with configurable lead times.
Flexible Tariff Builder
Build any utility tariff structure worldwide — Time-of-Use, flat-rate, demand-based, or seasonal. Configure energy rates, demand charges, network 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 in any currency.
Excel & PDF 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.
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.
Advanced BESS Scheduling
Define custom interval-based charging and discharging schedules with per-month overrides. Control exactly when the battery charges and discharges using flexible time windows, day-type filters (weekday/Saturday/Sunday), and AND/OR logic across intervals.
Ready to Start Your Analysis?
Join energy consultants worldwide who trust GreenWatt for their solar and BESS feasibility studies.
Try it free for 14 days — no credit card required.
Grow Your Renewable Energy Portfolio
Join our provider marketplace to access qualified deal flow from vetted EPC contractors and energy consultants across the globe.
Qualified Deal Flow
Receive pre-qualified project leads with bankable simulation data and detailed feasibility reports — no cold outreach needed.
Bankable Simulation Data
Every project comes with GreenWatt's engineering-grade energy modelling, financial analysis, and load-shedding impact assessments.
Term Sheet Management
Submit and manage term sheets directly through the platform. Track deal progress from initial enquiry to financial close.
We'll be in touch within 24 hours to discuss your requirements.
Terms & Conditions
1. Platform Usage
The GreenWatt 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 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 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.