Institute of Solar Technology (IST) - Cloud App (Software)

☀️ IST PVSolar Simulator v8.1.0

IST PVSolar Simulator v8.1.0, a major version update for renewable energy design software, it is used to simulate, plan, and optimize photovoltaic power systems, model microclimates, or calculate energy generation based on meteorological data.

Key Features of ☀️ IST PVSolar Simulator v8.1.0

The primary features often included in a Version 8.1 solar simulation environment are:

• Row Spacing Calculator popup: to ensure zero inter-row shadow during the design shading window. For each season (Winter Dec 21, Equinox Mar 20, Summer Jun 21), the calculator sweeps the shading window in 15-minute steps and finds the worst-case (minimum) solar altitude.
• Grid-Connected System Design: Tools to design and estimate energy yield for large-scale, standard grid-tied PV systems
• Meteorological Data Integration: Importing global or local weather files (e.g., typical meteorological year) to model long-term climatic impact.
• Full simulation + 6 result: Monthly charts, Loss cascade, P50/P75/P90/P99, Economics (NPV/LCOE/Payback), CO₂ balance, 25-year projection
• Financial & Economic Analysis: Calculating levelized cost of energy (LCOE), ROI, and system installation profitability.

No Need for .PAN and .OND Files

Unlike many conventional PV simulation software packages that require proprietary PV module (.PAN) and inverter (.OND) files, IST PVSolar Simulator eliminates this limitation.
Many PV module and inverter manufacturers do not provide downloadable .PAN and .OND files, making it difficult and time-consuming to evaluate different equipment in traditional simulation software.
With IST PVSolar Simulator, users can directly create a complete PV module or inverter model using the manufacturer's PDF datasheet.
Key Benefits

• 1. No dependency on proprietary .PAN or .OND files.
• 2. Supports virtually any commercially available PV module and inverter.
• 3. Easy entry of electrical specifications from manufacturer datasheets.
• 4. Quickly build a customized equipment database.
• 5. Compare multiple manufacturers without waiting for simulation files.
• 6. Ideal for feasibility studies, EPC design, technical due diligence, and bankable energy yield assessments.
• 7. Reduces engineering time and increases flexibility during equipment selection.

Users simply enter the required electrical parameters from the manufacturer's datasheet, and the software automatically creates the simulation model. Once created, the PV module and inverter are saved in the project database and can be reused in future simulations.
This feature makes IST PVSolar Simulator one of the most flexible and user-friendly PV design and energy simulation platforms, enabling engineers to simulate projects using their preferred equipment—even when official simulation files are unavailable.

IST PVSolar Simulator is an advanced solar photovoltaic (PV) system design and simulation software developed to support engineers, entrepreneurs, students, and renewable energy professionals in designing efficient solar power systems. The software initiative is associated with the visionary work of Sanjib Kr. Roy, Founder of Institute of Solar Technology, and IST R&D team members. Institute of Solar Technology IST, a leading renewable energy training and entrepreneurship development institution in India.

The simulator is designed to simplify complex solar engineering calculations and provide high accuracy design support for rooftop, C&I and utility-scale solar projects. IST PVSolar Simulator integrates AI based technical design methodologies, solar resource analysis, system sizing, electrical calculations, and performance estimation tools that help users to generate real-world solar plant simulation.

IST PVSolar Simulator V8.1.1 is a professional, browser-based PV simulation platform aligned with IEC 61724-1:2021, IEC 61853, BIS IS 16169, CEA Technical Standards 2010 (Amended 2023), and MNRE 2025 guidelines. The simulation engine uses POA transposition, cell temperature (Uc+Uv model), monthly energy, PR, P50/P90 exceedance probability, and LCOE/NPV/IRR financial analysis.
It supports project development in areas such as:

1. Solar PV system sizing and simulation
2. Rooftop and ground-mounted solar plant design
3. Energy yield estimation and performance analysis
4. Electrical design calculations
5. Solar water pumping system calculations
6. ACDB/DCDB engineering design
7. Battery and hybrid system analysis
8. Project documentation and techno-commercial evaluation

IST PVSolar Simulator Performance

1. Simulation Engine & Time Resolution

Feature	IST PVSolar Simulator	PVsyst	SAM (NREL)	Helioscope
Monthly simulation	✅	✅	✅	✅
Hourly (8,760 steps)	✅	✅	✅	✅
Sub-hourly (15-min, 35,040 steps)	✅	❌ (hourly only)		✅
POA Transposition Model	Perez	Perez / Hay-Davies	Perez / Isotropic	Perez
IAM Model	Martin-Ruiz	Martin-Ruiz / ASHRAE	ASHRAE	Physical
Cell Temp Model	NOCT + Faiman (Uc/Uv)	Faiman + NOCT	Sandia / King	NOCT
Air-mass spectral correction	✅	✅	✅	Partial

2. Irradiance & Weather Data

Feature	IST PVSolar Simulator	PVsyst	SAM (NREL)	Helioscope
NASA Hourly TMY	✅ (direct)	Manual	✅	❌
PVGIS TMY import	✅ (direct)	Manual	Via EPW	✅
Manual monthly entry	✅	Manual	✅	Limited

3. Loss Modeling

Live Electrical Safety Checks

Loss Component	IST PVSolar Simulator	PVsyst	SAM (NREL)	Helioscope
Thermal losses (NOCT/Uc/Uv)	✅
Soiling	User-defined %	Monthly variable	Monthly variable	Monthly variable
Row-to-row shading	✅ self-shading	3D near-shading	3D near-shading	3D layout engine
Far-horizon shading	✅ IEC 61724-1 §13.7	Horizon profile import	Horizon profile	Skyline tool
Inverter clipping	✅ true hourly/sub-hourly	✅	✅	✅
Mismatch, LID, aging	User-defined %	Modeled separately	Modeled	Partial
P50/P75/P90/P95	✅ (σ-based, IEC method)	✅	✅	✅
Interannual variability	✅	✅	✅	Limited

#	Check	Formula	Standard
1	Voc_max ≤ Inverter Max DC Voltage	Voc_STC × [1 + TC_Voc/100 × (T_min−25)] × N_mod	IEC 62548:2016 §6.1; IS 16221 Part 1
2	Vmp_max ≤ MPPT Max Voltage	Vmp_STC × [1 + TC_Voc/100 × (T_winter−25)] × N_mod	IEC 62548:2016 §6.2; IS 16221 Part 2
3	Vmp_min ≥ MPPT Min Voltage	Vmp_STC × [1 + TC_Pmax/100 × (T_summer−25)] × N_mod	IEC 62548:2016; inverter MPPT range
4	Array Current/MPPT ≤ MPPT Imax	Imp_STC × Strings_per_MPPT	IEC 62548:2016 §6.3; fuse >2 strings
5	Total DC Current/Inverter ≤ Inv Max DC Current	Imp × Str/MPPT × MPPT_used	IEC 62109-1:2010 §12; IS 16221 Part 1

Simulation Results & Analysis: Simulation Engine

The simulator runs a 12-month energy model (monthly resolution approach):

1. POA irradiance (H_POA from transposition)
2. Effective irradiance: apply IAM correction, soiling factor
3. Cell temperature: NOCT model or Uc+Uv model (per Uc, Uv, wind speed)
4. E_array: Pnom × H_POA_eff × temperature correction × DC loss chain × bifacial gain
5. Clipping: apply ILR-based clipping loss
6. E_AC: E_array × η_inverter × (1 − AC_wiring_loss)
7. P50/P75/P90/P95: apply Gaussian IAV uncertainty

POA Irradiance is the actual sunlight hitting a solar panel at its specific tilt and orientation. TMY (Typical Meteorological Year) is a synthetic dataset of hourly weather values meant to represent an "average" year over a long historical period To get the most accurate performance estimate for a PV plant, system designers take the raw horizontal GHI data from a TMY file and mathematically transpose it into POA Irradiance using the planned panel angles.

Sanjib Roy has played a significant role in renewable energy skill development, mentoring solar entrepreneurs and engineers through practical training, software-based learning, and entrepreneurship development programs. Industry and institutional profiles describe him as a solar technology mentor and corporate trainer with extensive experience in PV solar system design and business development.

Final Report Intelligence

Full A4-style report with cover page, summary, system parameters, losses table, monthly results, P50-P90, economics, CO₂, signatures.

• Project Summary: Geographical Site - Solar Resource — Monthly Averages import from NASA ESS upto 2024.
• Tilt Angle and Azimuth: Tilt angle auto optimization, Calculate Annual POA,
• System Summary: PV Array Characteristics, Inverter Detail, System Loss Diagram,
• Main Results: System Production, Energy Injected into Grid vs Year of Operation, Performance Ratio vs Year of Operatio
• Economic Evaluation & Financial Analysis: P50 / P75 / P90 / P95 Evaluation, Cost of the System & Financial Analysis, Detailed Economic Results — Year by Year
• CO₂ Emission Balance
• PDF (print-quality) report file

🔆 IST Solar DCDB Designer v3.0

🔆 IST Solar DCDB Designer v3.0 is an electrical planning and specification tool used to correctly size and configure Direct Current Distribution Boxes (DCDB) for solar photovoltaic (PV) power plants. Developed by the Institute of Solar Technology (IST), it helps EPC contractors and engineers safely design the DC circuit.

Key Features and Capabilities

• String Calculations: Automatically calculates the current and voltage ratings based on the number of strings and the specifications of the solar panels.
• Component Selection: Recommends the correct sizing for safety equipment like DC Surge Protection Devices (SPDs), DC Fuses, and DC Isolators/MCBs based on IEC/IS standards.
• Bill of Quantities (BoQ): Generates a comprehensive materials list and estimates to ensure budget accuracy.
• Safety & Compliance: Ensures the DCDB layout complies with the safety guidelines required for high-voltage DC circuits to protect inverters from surges and short circuits.

🔆 IST Solar ACDB Designer v4.1

🔆 IST Solar ACDB Designer v4.1, Professional engineering tool for complete ACDB design for solar power plants — residential rooftop to utility scale. MCCB/MCB/SPD/CT/Busbar/Cable/RCBO design. A4 PDF print · PASS/FAIL verification.

Standards: IEC 61439, IEC 60947-2/3, IEC 61643-11, IEC 60364, IEC 60529, IS 13947, IS 694, IS 3043, IS 8623, CEA Regulations 2010, IEEE 519.

Key Features of v4.1

• Automated Sizing: Accurately calculates required MCB/MCCB ratings, Surge Protection Devices (SPDs), and wire gauges based on inverter capacity.
• Safety Configurations: Automatically defines IP-rated enclosures, copper busbars, and terminal blocks for both single-phase (240V) and three-phase (415V) systems.
• Full Calculation Engine: • XLPE vs PVC separate derating tables (7 temperature points each), • Grouping factor K_g (IEC Table B.52.17), • Auto-match MCCB/MCB/Cable/Busbar/SPD with PASS/WARN, • PVC vs XLPE ampacity correction,

IST Solar SLD Designer V3.0 Pro

IST Solar SLD Designer, your complete Solar Power Plant SLD CAD Tool V3.0 Pro— a full professional-grade Solar power plant Single Line Digram SLD drawing tool.

Key Features of SLD Designer V3.0 Pro

• PV Array, Rooftop Structure, Pole Mount Structure, Tilt Angle Detail.
• String CB, DCDB, Inverter (triangle symbol), ACDB, Solar Meter, Net Meter, Grid, Battery.
• Circuit Breaker, MCCB, Fuse, SPD, Isolator, RCCB, Lightning Arrester, Earth Pit (section view).

Drawing Intelligence

• X/Y axis coordinate system (like CAD software) with snap-to-grid
• All objects draggable — click and drag to move anywhere
• 8-handle resize — drag corner/edge handles to resize any object
• Right-click context menu with full operations
• IEC Reference Table — 11 IEC/IS standards
• PDF (print-quality), SVG, Print (white background)

☀️ IST Solar Water Pump System Designer V3.0

IST Solar Water Pump System Designer, a major version update for Solar powered water pumping system for Drinking Water Supply, PV KUSUM, Irrigation — Drip, Irrigation — Surface, Irrigation — Sprinkler, Industrial / Commercial uses, Livestock Watering system.

Key Features of ☀️ IST Solar Water Pump System Designer V3.0

The primary features often included in a Version 3.0 :

• System block diagram auto-generated with actual calculated values
• Pump auto-recommendation — finds best matching pump from Database
• Full simulation Result: A4 print report with all formulas, Calculation Steps with Full PASS/FAIL Verification.

☀️ IST Solar Proposal Generator

IST Solar Proposal Generator , is a professional proposal with quotation generator, generate proposal by the name and Logo of your company.

Key Features of IST olar Proposal Generator

The primary features often included:

• KEY PROJECT HIGHLIGHTS System Capacity, Annual Generation (kWh), Year-1 Annual Savings, Payback Period, IRR (27-Year).
• Report Pages: — Cover Letter, Detail Quotation with your company detail, PROJECT TERMS AND CONDITIONS
• DESIGN OVERVIEW: SYSTEM DESIGN OVERVIEW, Monthly Solar Generation vs Energy Consumption (kWh), Monthly Electricity Bill Savings (₹) — Solar vs Grid
• FINANCIAL ANALYSIS: CAPEX / OPEX / ROI (27 YEARS), 27-Year Annual & Cumulative Savings Projection, GOVT. SUBSIDY CALCULATION
• COMPANY PROFILE: About your company, installed project history, project ongoing, project pipe line, Registration detail etc.

Generated Proposal includes 7 A4 pages:

• Branded Cover Page (KPIs + Benefits)
• Cover Letter (Page 1)
• Quotation with GST Breakdown (Page 2)
• Terms, Conditions & Disclaimer (Page 3)
• System Design + Monthly Charts (Page 4)
• Financial Analysis — CAPEX/OPEX (Page 5)
• 27-Year Projection Chart & Table (Page 6)
• Subsidy Details + Company Profile (Page 7)

⚡ EVCS Pro — EV Charging Station Design Framework V2.0

EVCS Pro — EV Public Charging Station Engineering Design Framework, a major version update for EV Public charging station development design selection of CHARGER CONFIGURATION, LOAD DEMAND CALCULATION - Total Connected Load (TCL), Daily Energy Demand E(daily), Average Power Demand P_avg, Peak Demand P_peak (Fast Charging Concurrency), Design Demand with Expansion, TRANSFORMER SIZING & SELECTION, HT CONNECTION DESIGN, LT PANEL DESIGN — 415V, 3Φ, 4W, 50Hz, IS and IEC Standard, EARTHING SYSTEM — IS 3043:2018, COMPLIANCE SUMMARY, APPLIED STANDARDS REFERENCE.

Key Features of EV Charging Station Design Framework V2.0 <

The primary features often included in a Version 2.0 :

• STANDARDS COMPLIANCE CHECK — BIS / IEC / CEA: EV Charging Equipment, Transformer, LT Panel, Protection, HT System, Earthing, Civil & Safety, and Harmonic Distortion. 30+ checks across BIS, IEC, CEA, IS standards — PASS / WARN / FAIL Verification.
• Full simulation Result: A4 print report with all formulas, Calculation Steps with Full PASS/FAIL Verification.

⚡ 2W / 3W EV Battery Pack Designer V6.0

Lithium-ion Battery Pack Design, for 8 Vehicle Types with auto-defaults: E-Bike, E-Scooter, E-Moped, E-Motorcycle, 3W Cargo, 3W Passenger, LSEV, Golf Cart. E-Bike — Typical: 250W motor, 36–48V, 20–40km range. Governed by BIS IS 16893 Part 1. Max speed 25 km/h for EPAS class, ESCOOTER — E-Scooter — 1–2.5kW, 48–60V, 60–100km range. ARAI AIS-049. Speed up to 70 km/h, EMOPED — E-Moped — 800W–2kW, 48V, 50–80km range. BIS IS 16893 + AIS-049, E-Motorcycle — 3–10kW, 72V, 100–200km. CMVR type approval + ARAI, 3W PASSENGER — 3-Wheeler Passenger Auto — 4–8kW, 48–72V, 120–200km. CMVR + AIS-049., 3W CARGO — 3-Wheeler Cargo — 2–5kW, 48V, 80–120km. AIS-100, CMVR, AIS-049.

Key Features of 2W / 3W EV Battery Pack Designer V6.0 <

The primary features often included in a Version 6.0 :

• SP Configuration: Series & Parallel Auto Configuration
• Configuration Analysis: Current Analysis & Cell Check
• BMS Selection: Auto Recommand best fit BMS from Database
• Other Components Selection: Auto-Recommended Components
• Live Simulation: SOC, Pack Voltage, Current, Power, Temp, Range Done
• Full Thermal Imaging & Analysis: Full Thermal Imaging & Analysis under different Ambient Temp and different load. Calculate Min Cell Temp. Max Cell Temp, Avg Cell Temp, Temp Spread, Cooling Eff. and give Status.
• Battery Housing Design
• Required Quality Pass List: BIS · ARAI · IEC Certification Guide. BIS IS 16893:2018 — India EV Battery, ARAI AIS-049 — EV Type Approval, IEC 62133-2:2017 — Li-Ion Cell Safety, UN 38.3 — Transport Safety
• BIS · IEC · ARAI Compliance: Full Compliance Verification PASS / FAIL
• Full simulation Result: A4 print report with all formulas, Calculation Steps with Full PASS/FAIL Verification.