: IST Usefull App

☀ Tab 1 — Project & Site Information

? Help

📋 Project Information

Project Name: Client Name: Client Address: Engineer Name: Organization: Project Type: Date: Ref No: Prepared By:

📍 Site Location

Latitude (°N): Longitude (°E):

Location Name: State / Country: Altitude (m):

Update from NASA SSE Data Table

Min Winter Temp (°C): Winter Vmpp Temp (°C): Summer Vmpp Temp (°C): CO₂ Factor (kg/kWh):

Set NASA Data Start Year and NASA Data End Year

NASA Data Start Year: NASA Data End Year:

🌤 Monthly Weather Data (Manual / NASA SSE)

Month	GHI (kWh/m²/d)	DNI (kWh/m²/d)	DHI (kWh/m²/d)	Temp (°C)	Wind (m/s)	Humidity (%)	Days
Annual	—	—	—	—	—	—	365

Formula Used: Annual GHI = Σ(GHI_daily × Days) [kWh/m²/yr]

🧭 Tab 2 — Orientation Setting & POA Calculation

? Help

🔧 Tilt & Azimuth Settings

Tilt Angle (°): Azimuth (Northern Hemisphere=0°, SH=180°): Ground Albedo: Module Height (m): Row Spacing (m):

Click Recalculate POA or Auto-Optimize Tilt to see results.

📐 Orientation Loss vs Optimum

Run calculation to see orientation loss comparison.

POA Transposition Formula:
cos_incidence = cos(tilt)×cos(θz) + sin(tilt)×sin(θz)×cos(az_diff)
POA_factor = max(0.7, min(1.4, cos_incidence + 0.15))
δ = −23.45 × cos(360/365 × (DOY+10)) [Solar Declination]
cos(θz) = sin(φ)sin(δ) + cos(φ)cos(δ) [Zenith angle]
H_POA_monthly = GHI_daily × Days × POA_factor [kWh/m²]
G_reflected = GHI × Albedo × (1 − cos(tilt_rad)) / 2

☀ Monthly POA Irradiance Table

Month	GHI (kWh/m²/d)	Days	POA Factor	G_reflected	H_POA (kWh/m²)	H_POA Cum.
Annual H_POA (kWh/m²/yr)					—

📊 Monthly POA Irradiance Chart

⚙ Tab 3 — System Parameters

? Help

🔋 PV Module Selection

Filter by Manufacturer: Select Module: Bifacial Factor (ɸ): Approx. Plant Size (kWp): Approx. Modules Needed:

Select a module to see specifications.

🔌 Inverter Selection

Filter by Manufacturer: Select Inverter:

Select an inverter to see specifications.

⚡ String Voltage Design Check

Modules per String:

Select module and enter modules/string.

String Voltage Formulas:
Voc_min_temp = Voc_STC × [1 + γ_Voc × (T_min − 25)] × N_modules
Vmp(T_max) = Vmp_STC × [1 + γ_Pmax × (T_summer − 25)] × N_modules
Vmp(T_min) = Vmp_STC × [1 + γ_Pmax × (T_winter − 25)] × N_modules
Condition: Vmp_min > V_inv_min AND Voc_max < V_inv_max

Befor start your project design simulation, choose Module and Inverter manufactures, select available model and Add specification datasheet , Save and download datasheet in your folder to use in your simulation. If you are using default database models, inverters carefully compare the software's loaded values against the downloaded manufacturer datasheet. To ensure an accurate simulation, you must always align your software's component database with the manufacturer's exact specifications.

📉 Tab 4 — Loss Calculation (PVSolar Method)

? Help

🔧 Thermal & Other Parameters

Thermal Loss Coeff Uc (W/m²K): Wind Factor Uv (W/m²K/ms): Interannual Variability σ (%):

T_cell = T_amb + (NOCT−20)/800 × G_eff [NOCT method]
T_cell = T_amb + G_eff / (Uc + Uv×Wind) [Uc/Uv method]
P50 = E_annual | P75 = P50×(1−0.674×σ)
P90 = P50×(1−1.282×σ) | P95 = P50×(1−1.645×σ)

📊 Loss Summary

Run simulation to see loss summary.

📋 PVSolar Loss Table

Loss Component	Loss (%)	Remaining (%)	Note
Total Loss Factor			of input energy

📊 System Loss Diagram

📈 Clipping Loss Chart

ILR (DC/AC Ratio):

🏗 Tab 5 — Sub-array Design (String Configuration)

? Help

🔋 Selected PV Module

No module selected — go to Tab 3 to select a PV module.

⚙️ Selected Inverter

No inverter selected — go to Tab 3 to select an inverter.

➕ Add New Sub-array (Unit)

Modules/String:

Strings/MPPT:

MPPT used/Inverter:

No. of Inverters:

💰 Tab 6 — Economic Evaluation

✅ Include in Report ? Help

📦 CAPEX — Installation Cost

Item Description	Qty	Unit	Rate (₹)	Cost (₹)	GST%	GST ₹	Total (₹)
Total CAPEX (₹)							—
Total CAPEX (₹ Lakhs)							—

🏦 Financing Structure

Total Investment (₹): Own Fund (₹): PM Subsidy - PMSGMY (₹): State Govt Subsidy (₹): Loan Amount (₹): Rate of Interest (%/yr): Loan Tenure (Years): Monthly EMI (₹):

🔧 Annual OPEX

OPEX Item	Cost/yr (₹)
Total OPEX/yr (₹)	—

Electricity Tariff (₹/kWh): Tariff Escalation (%/yr): Discount Rate (%/yr): Project Life (Years): Degradation Rate (%/yr):

🚀 Tab 7 — Simulation Engine

? Help

Enter project details in Tabs 1–6, then click RUN SIMULATION.

Month	GHI (kWh/m²/d)	H_POA (kWh/m²)	T_cell (°C)	E_array (MWh)	E_AC (MWh)	PR (%)	Yf (kWh/kWp)
Annual	—	—	—	—	—	—	—

📐 Formulas & Functions Used in Simulation

1. POA Transposition: cos_incidence = cos(tilt)×cos(θz) + sin(tilt)×sin(θz)×cos(az_diff)
2. POA Factor: POA_factor = max(0.7, min(1.4, cos_incidence + 0.15))
3. G_reflected: GHI × Albedo × (1 − cos(tilt_rad)) / 2
4. H_POA_monthly: GHI_daily × Days × POA_factor + G_reflected × Days
5. Cell Temperature (NOCT): T_cell = T_amb + (NOCT−20)/800 × G_eff
6. Cell Temperature (Uc/Uv): T_cell = T_amb + G_eff/(Uc + Uv×Wind)
7. DC Energy: E_array = Pnom × (H_POA/1000) × [1 + γ×(T_cell−25)] × Loss_factor × Bif_gain
8. Bifacial Gain: Bif_gain = 1 + 0.1×mod_bif (if bifacial selected)
9. AC Output: E_AC = E_array × η_inv × (1 − AC_wiring_loss)
10. Performance Ratio: PR(%) = [E_AC / (H_POA × Pnom)] × 100
11. Specific Yield: Yf = E_AC_annual / Pnom [kWh/kWp/yr]
12. Array Yield: Ya = E_array_annual / Pnom
13. Capacity Factor: CF(%) = E_AC / (Pnom×8760) × 100
14. P50/P75/P90/P95: Px = P50 × (1 − z×σ) where z=0, 0.674, 1.282, 1.645
15. LCOE: [CAPEX + Σ(OPEX_t/(1+r)^t)] / Σ(E_t/(1+r)^t)
16. NPV: −CAPEX + Σ[(Revenue_t − OPEX_t)/(1+r)^t]
17. IRR: Newton-Raphson iteration on NPV=0
18. EMI: P×r×(1+r)^n / [(1+r)^n−1] where r=monthly rate, n=months
19. CO₂: CO₂_annual = E_AC×factor | Trees = CO₂/21.77 | Cars = CO₂/4600

☀ Tab 1 — Project & Site Information

📋 Project Information

📍 Site Location

Update from NASA SSE Data Table

Set NASA Data Start Year and NASA Data End Year

🌤 Monthly Weather Data (Manual / NASA SSE)

🧭 Tab 2 — Orientation Setting & POA Calculation

🔧 Tilt & Azimuth Settings

📐 Orientation Loss vs Optimum

☀ Monthly POA Irradiance Table

📊 Monthly POA Irradiance Chart

⚙ Tab 3 — System Parameters

🔋 PV Module Selection

🔌 Inverter Selection

⚡ String Voltage Design Check

📉 Tab 4 — Loss Calculation (PVSolar Method)

🔧 Thermal & Other Parameters

📊 Loss Summary

📋 PVSolar Loss Table

📊 System Loss Diagram

📈 Clipping Loss Chart

🏗 Tab 5 — Sub-array Design (String Configuration)

🔋 Selected PV Module

⚙️ Selected Inverter

➕ Add New Sub-array (Unit)

📊 Total System Summary

💰 Tab 6 — Economic Evaluation

📦 CAPEX — Installation Cost

🏦 Financing Structure

🔧 Annual OPEX

📊 Financial Analysis Results

📋 Year-by-Year Projection

🚀 Tab 7 — Simulation Engine

📊 Monthly Simulation Results Table

📊 Eac vs Earray vs GPOA Chart

📈 Probability - P50/P75/P90/P95

📋 Probability Analysis

📊 Year vs Energy into Grid (25 Yrs)

📊 Year vs Energy & Revenue

📊 Performance Ratio vs Year

💡 How to Improve Performance Ratio (PR)

🌿 Environmental Impact (CO₂ Savings)

📐 Formulas & Functions Used in Simulation

🗄 Databases — PV Modules & Inverters

🔋 PV Module Database (panel.JSON)

🔌 Inverter Database (inverter.JSON)

⚙ Settings — File Paths & Defaults

☀ About IST PVSolar Simulator V8.1.0

IST PVSolar Simulator

⚙ Application Settings

Add PV Module

Add Inverter

📄 IST PVSolar Simulator — Simulation Report

📐 Solar Row Spacing Calculator — Shadow-Free Pitch Design

📍 Site (from Tab 1)

🔧 Module Geometry (from Tab 2)

⏱ Shading Window & Controls