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ENGINEERING-GRADE SOLAR SIZING

Professional Solar Plant Design Software

Calculate. Configure. Validate. Report.

Design On-Grid, Hybrid and Off-Grid solar systems with load estimation, inverter selection, PV string sizing, battery sizing and cable selection — all in one professional workflow.

See How It Works

Trusted design workflow for Solar Installers • EPC Companies • Dealers • Service Engineers

PV ARRAY DC BUS INVERTER 230V AC LOAD 48V DC BATTERY BANK REF: SLD-01 SCALE: NTS
SOLAR KA GURU / SIZING ENGINE REV. 03

What can I design?

☀️

On-Grid

Single Phase & Three Phase

🔋

Hybrid

Single Phase & Three Phase

⚡

Off-Grid

Solar + Battery Systems

6
System Design Modes
Up to 250 kVA
Hybrid System Capacity
12+
Appliance Load Presets
1 Click
Customer-Ready PDF

Basic Calculator

Get a quick estimate of your PV string configuration and battery backup requirement using a few key inputs — before you move to the full solar plant sizing tool.

Basic Calculator

SELECT OPTION

From Customer Requirement to Professional Design

01

Enter Requirements

Customer details, load, location and system requirements.

02

Configure System

Select inverter, panels, battery and system configuration.

03

Validate Design

Check PV sizing, strings, voltage, battery and cable requirements.

04

Generate Report

Create a professional customer-ready design report.

Built for every configuration you quote

Pick a category to jump straight into that calculator.

Off-Grid Inverter

Independent power system with batteries — with or without grid-assisted charging.

Configure

Hybrid Inverter

Grid-tie plus battery backup, sized for single-phase or three-phase supply.

Configure

On-Grid Inverter

Grid-export systems with no battery, for standard net-metered installs.

Configure

Slabs for Update

Select the inverter category to view and update the corresponding slab tables.

Off-Grid Inverter

View and manage off-grid inverter slabs, battery ranges and standalone system ratings.

Open Slab

Hybrid Inverter

View and manage hybrid inverter slabs for single-phase and three-phase configurations.

Open Slab

On-Grid Inverter

View and manage on-grid inverter slabs for net-metered and grid-export systems.

Open Slab

Same rulebook as your senior design engineer

Solar Ka Guru applies standardized equipment tables and engineering-based sizing rules to help installers create consistent solar system designs.

Standardized Calculations

Use defined inverter, panel and wire-rating slabs instead of manually searching through spreadsheets.

Consistent Designs

Apply the same configured design rules across projects and team members.

Fewer Manual Calculations

Reduce repetitive calculations and manual slab lookups.

Customer-Ready Reports

Turn the completed design into a professional report.

One Design. Complete Engineering Output.

Load Calculation

Calculate connected and backup load.

Inverter Selection

Select the appropriate inverter slab.

PV Configuration

Series / parallel string configuration.

Battery Sizing

Determine battery requirements.

Cable Selection

Select appropriate cable rating.

Design Report

Generate a professional PDF.

Built for Solar Professionals

Solar Installers

Design systems faster and reduce manual calculations.

EPC Companies

Standardize system design across projects and teams.

Dealers & Distributors

Support customers with consistent system recommendations.

Service Engineers

Quickly validate system configuration and equipment selection.

Designed alongside people who install this every day

Ready to Design Your Solar Plant?

Turn your customer requirements into a complete solar system design.

On-Grid System Design

On-Grid Single Phase Calculator

Complete system sizing with inverter selection, PV string configuration, and wire rating — exported as a branded PDF report.

Customer Details

Step 1: On-Grid (Single Phase) Configuration

Step 2: System Sizing Results

Enter your monthly bill and panel wattage, then click Calculate to see your on-grid system design.

Step 3: System Sizing Plant

System Sizing: Single Phase On-Grid Inverter plant layout showing Solar PV array, DC DB, on-grid inverter, AC DB, grid meter and earthing
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Single Phase On-Grid Slab Editor

Edit lookup tables for Panel Specs, Inverter Models & Capacity Ratings

🔌Inverter Models & Ratings

Inverter Max Power (W)Model NameFull Solar Cap Max (W)Inverter Max Voc (V)

☀️Panel Specifications

Max Wattage ThresholdActual Wattage (W)Panel Voc (V)Panel Imp (A)

Generated JavaScript


            

JSON Preview


            
Instructions
For Slab Update

After making the changes → Click Generate JS Code → Click Apply to Calculator → Click Close → Reload the Website.

To Save Updated Slab

Click Save/Set → Click Close → Reload the Website.

To Reset to Default Values

Click Reset to Defaults → Click Generate JS Code → Click Apply to Calculator → Click Save/Set → Click Close → Reload the Website.

On-Grid System Design

On-Grid Three Phase Calculator

Complete system sizing with inverter selection, PV string configuration, and wire rating — exported as a branded PDF report.

Customer Details

Step 1: On-Grid (Three Phase) Configuration

Step 2: System Sizing Results

Enter your monthly bill and panel wattage, then click Calculate to see your on-grid three phase system design.

Step 3: System Sizing Plant

System sizing: three-phase on-grid inverter wiring diagram showing Solar PV array, DC DB, three phase inverter, AC DB, grid meter, three phase grid and earthing
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—
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Three Phase On-Grid Slab Editor

Edit lookup tables for Panel Specs, Inverter Models & Capacity Ratings

🔌Inverter Models & Ratings

Inverter Max Power (W)Model NameFull Solar Cap Max (W)Inverter Max Voc (V)Min Voc (V)

☀️Panel Specifications

Max Wattage ThresholdActual Wattage (W)Panel Voc (V)Panel Imp (A)

Generated JavaScript


            
Instructions
For Slab Update

After making the changes → Click Generate JS Code → Click Apply to Calculator → Click Close → Reload the Website.

To Save Updated Slab

Click Save/Set → Click Close → Reload the Website.

To Reset to Default Values

Click Reset to Defaults → Click Generate JS Code → Click Apply to Calculator → Click Save/Set → Click Close → Reload the Website.

Off-Grid Inverter

Independent power system with batteries. Works without grid supply.

Hybrid Inverter

Combines grid-tie and battery backup. Best of both worlds.

On-Grid Inverter

Connected to the main grid. Exports power, no battery backup.

Off-Grid (Without Grid)

100% solar + battery. No grid connection required.

Off-Grid (With Grid)

Off-grid inverter that can charge the battery from grid (e.g. at night).

Hybrid (Single Phase)

Best for residential use with standard single-phase grid connection.

Hybrid (Three Phase)

Designed for larger loads or commercial use with three-phase grid connection.

On-Grid (Single Phase)

Standard residential grid-tied system with single-phase connection.

On-Grid (Three Phase)

Commercial or large residential grid-tied system with three-phase connection.

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0% Solar Overloading

Standard configuration with no panel oversizing.

10% Solar Overloading

Moderate oversizing for improved morning/afternoon yield.

30% Solar Overloading

Aggressive oversizing for peak clipping optimization.

Lead-Acid Back-Up Calculator

Traditional flooded or sealed lead-acid battery bank sizing with depth-of-discharge limits.

Lithium Back-Up Calculator

Lithium-ion or LiFePO₄ battery bank sizing with higher usable capacity and cycle life.

Off-Grid Inverter (Without Grid)

Open the Solar Slab Editor for Off-Grid (Without Grid) Inverter configuration.

Off-Grid Inverter (With Grid)

Off-grid inverter that can charge the battery from grid. View grid-assisted off-grid slab tables.

Single Phase Hybrid Inverter

Best for residential use with standard single-phase grid connection. View single-phase hybrid slab tables.

Three Phase Hybrid Inverter

Designed for larger loads or commercial use with three-phase grid connection. View three-phase hybrid slab tables.

Single Phase On-Grid Inverter

Open the Solar Slab Editor for Single Phase On-Grid Inverter configuration.

Three Phase On-Grid Inverter

Open the Solar Slab Editor for Three Phase On-Grid Inverter configuration.

MPPT-Aware Configuration

Basic String Configuration (0% Overloading) Calculator

Optimal series & parallel string sizing for standard, non-overloaded PV configurations.

Step 1: Inverter & Panel Configuration

Step 2: Optimal String Sizing Results

Enter your inverter and panel specifications, then click Calculate Configuration to see the optimal string configuration.

MPPT-Aware Configuration

Basic String Configuration (10% Overloading) Calculator

Optimal series & parallel string sizing with moderate panel oversizing for improved morning/afternoon yield.

Step 1: Inverter & Panel Configuration

Step 2: Optimal String Sizing Results

Enter your inverter and panel specifications, then click Calculate Configuration to see the optimal string configuration.

MPPT-Aware Configuration

Basic String Configuration (30% Overloading) Calculator

Optimal series & parallel string sizing with aggressive panel oversizing for peak clipping optimization.

Step 1: Inverter & Panel Configuration

Step 2: Optimal String Sizing Results

Enter your inverter and panel specifications, then click Calculate Configuration to see the optimal string configuration.

Slab-Based Efficiency Model

Lead-Acid Battery Back-Up Calculator

Estimate backup runtime for your lead-acid battery bank under connected load.

Step 1: Battery & Load Parameters

Step 2: Backup Time Estimation

Enter your battery voltage, Ah rating, and load, then click Calculate Backup Time to see the estimate.

80% Depth of Discharge (DOD) Model

Lithium Battery Back-Up Calculator

Estimate backup runtime for your lithium battery bank under connected load.

Step 1: Battery & Load Parameters

Step 2: Backup Time Estimation

Enter your battery voltage, Ah capacity, and load, then click Calculate Backup Time to see the estimate.

Off-Grid System Design

Off-Grid (Without Grid) Calculator

Complete solar plant design with load estimation, battery backup time, inverter selection, PV string configuration, and wire rating — exported as a branded PDF report.

Customer Details

Step 1: Load Estimation Sheet

Enter BACK-UP LOAD, CONNECTED LOAD, and Hours for each appliance.
BKUP QTY determines the load on the inverter. Total (WH) = QTY × Watts × Hours.

Appliance Back-Up Load Connected Load Watts Hours Load (W) Total (WH) Action

Step 2: Off-Grid (Without Grid) Configuration

Step 3: Advanced System Sizing

Click the Calculate button in Step 2 to view your complete solar design, inverter ratings, and backup times.

Step 4: System Sizing Plant

System sizing: off-grid inverter (without grid) layout showing Solar PV array, DC DB, off-grid inverter, battery, AC DB, load and earthing

Off-Grid (Without Grid) Slab Editor

Edit lookup tables for Inverter Ratings/Model/Max Voc and Panel Voc/Imp Specifications

🔌Inverter Ratings, Model & Max Voc

Inverter Rating (eg. 1KVA/24VDC)Reference Power (W)Inverter Model NumberMax Voc (V)

☀️Panel Voc / Imp Specifications

Min Wattage (X)Max Wattage Threshold (Y)Panel Voc (V)Panel Imp (A)

Generated JavaScript


            
Instructions
For Slab Update

After making the changes → Click Generate JS Code → Click Apply to Calculator → Click Close → Reload the Website.

To Save Updated Slab

Click Save/Set → Click Close → Reload the Website.

To Reset to Default Values

Click Reset to Defaults → Click Generate JS Code → Click Apply to Calculator → Click Save/Set → Click Close → Reload the Website.

Off-Grid System Design (Grid-Assisted)

Off-Grid (With Grid) Calculator

Complete solar plant design with load estimation, battery backup time, grid-assisted inverter selection, PV string configuration, and wire rating — exported as a branded PDF report.

Customer Details

Step 1: Load Estimation Sheet

Enter BACK-UP LOAD, CONNECTED LOAD, and Hours for each appliance.
BKUP QTY determines the load on the inverter. Total (WH) = QTY × Watts × Hours.

Appliance Back-Up Load Connected Load Watts Hours Load (W) Total (WH) Action

Step 2: Off-Grid (With Grid) Configuration

Step 3: Advanced System Sizing

Click the Calculate button in Step 2 to view your complete solar design, inverter ratings, and backup times.

Step 4: System Sizing Plant

System sizing: off-grid inverter (with grid) layout showing Solar PV array, DC DB, off-grid inverter, battery, AC DB, grid meter, load and earthing

Off-Grid (With Grid) Slab Editor

Edit lookup tables for Inverter Ratings/Model/Max Voc and Panel Voc/Imp Specifications

🔌Inverter Ratings, Model & Max Voc

Inverter Rating (eg. 1KVA/24VDC)Reference Power (W)Inverter Model NumberMax Voc (V)

☀️Panel Voc / Imp Specifications

Min Wattage (X)Max Wattage Threshold (Y)Panel Voc (V)Panel Imp (A)

Generated JavaScript


            
Instructions
For Slab Update

After making the changes → Click Generate JS Code → Click Apply to Calculator → Click Close → Reload the Website.

To Save Updated Slab

Click Save/Set → Click Close → Reload the Website.

To Reset to Default Values

Click Reset to Defaults → Click Generate JS Code → Click Apply to Calculator → Click Save/Set → Click Close → Reload the Website.

Hybrid System Design (Single Phase)

Hybrid (Single Phase) Calculator

Complete solar plant design with load estimation, battery backup time, hybrid inverter selection, PV string configuration, and wire rating — exported as a branded PDF report.

Customer Details

Step 1: Load Estimation Sheet

Enter Back-Up Load, Connected Load, and Hours for each appliance.
BKUP QTY determines the load on the inverter. Total (WH) = QTY × Watts × Hours.

Appliance Back-Up Load Connected Load Watts Hours Load (W) Total (WH) Action
TOTAL 0 0

Step 2: Hybrid (Single Phase) Configuration

Step 3: Advanced System Sizing

Click the Calculate button in Step 2 to view your complete solar design, inverter ratings, and backup times.

Step 4: System Sizing Plant

System sizing: hybrid single phase inverter layout showing Solar PV array, DC DB, hybrid inverter, battery, AC DB, grid meter, load and earthing

Hybrid (Single Phase) Slab Editor

Edit lookup tables for Inverter Ratings/Model/Max Voc, Panel Voc/Imp Specifications, and the Ceiling Capacity → Inverter Power slab.

🔌Inverter Ratings, Model & Max Voc

Inverter Model NumberInverter Rating (eg. 1KVA/48VDC)Power (W)VAMax Voc (V)

☀️Panel Voc / Imp Specifications

Min Wattage (X)Max Wattage Threshold (Y)Panel Voc (V)Panel Imp (A)

Generated JavaScript


            
Instructions
For Slab Update

After making the changes → Click Generate JS Code → Click Apply to Calculator → Click Close → Reload the Website.

To Save Updated Slab

Click Save/Set → Click Close → Reload the Website.

To Reset to Default Values

Click Reset to Defaults → Click Generate JS Code → Click Apply to Calculator → Click Save/Set → Click Close → Reload the Website.

Hybrid System Design (Three Phase)

Hybrid (Three Phase) Calculator

Complete solar plant design with per-phase load estimation, battery backup time, hybrid inverter selection, PV string configuration, wire rating and phase balance — exported as a branded PDF report.

Customer Details

Step 1: Appliance Load Table

Enter BKUP QTY (R/Y/B) and Connected Load QTY (R/Y/B) quantities per phase and Hours for each appliance.
BKUP QTY determines the load on the inverter. Total (WH) = Connected Load × Hours.

# Appliance Special Case (Back-Up) Connected Load Consumption
(W)
Load Watt
(Back-Up)
Connected
Load (W)
Hours Total Load
(W)
R-Phase Y-Phase B-Phase R-Phase Y-Phase B-Phase

Step 2: Hybrid (Three Phase) Configuration

Step 3: Advanced System Sizing

Click the Calculate button in Step 2 to view your complete solar design, inverter ratings, backup times, and phase balance.

Step 4: System Sizing Plant

System sizing: hybrid three phase inverter layout showing Solar PV array, DC DB, hybrid inverter, battery, AC DB, grid meter, load and earthing

Hybrid (Three Phase) Slab Editor

Edit lookup tables for Inverter Models & Ratings and Panel Specifications.

🔌Inverter Models & Ratings

Model Number Rating (eg. 5KVA/48VDC) Power (W) Power (VA) Max Voc (V) Solar Capacity Max (W)

☀️Panel Specifications

Min Wattage (Lower)Max Wattage ThresholdPanel Voc (V)Panel Imp (A)

Generated JavaScript


            
Instructions
For Slab Update

After making the changes → Click Generate JS Code → Click Apply to Calculator → Click Close → Reload the Website.

To Save Updated Slab

Click Save/Set → Click Close → Reload the Website.

To Reset to Default Values

Click Reset to Defaults → Click Generate JS Code → Click Apply to Calculator → Click Save/Set → Click Close → Reload the Website.

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