Solar System Sizing Calculator

Electrical Load Configuration

Solar System Parameters

System Voltage Volts DC

Wiring Loss Factor %

Summer Sunshine Hours/Day

Winter Sunshine Hours/Day

Monsoon Sunshine Hours/Day

Inverter Parameters

Expansion Factor %

Inverter Efficiency %

Power Factor

Solar Panel Options

Panel Wattage Watts

Panel Voltage Volts

Calculation Results

Daily Energy Consumption

--

Watt-hours per Day

Total Appliances --

Peak Load --

Average Usage -- Hours/Day

Solar Panel Requirements

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Required Solar Panel Capacity

--

Number of Solar Panels

Average Sunshine -- Hours/Day

Correction Factor --

Total Panel Capacity -- Watts

Inverter Requirements

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Inverter Size (Watts)

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Inverter Size (VA)

Power Factor --

Efficiency --

Expansion Margin --

Solar Panel Array Configuration

Panels in Series --

Strings in Parallel --

Total Voltage -- V

System Flow Diagram

Solar Panels

Charge Controller

Battery Bank

Inverter

AC Loads

Step-by-Step Calculations

Example Configurations

Example 1: Home Office Setup

Appliances: 1×100W Computer (8h), 2×60W Fans (8h), 1×100W Lights (8h)

System: 48V DC, 20% wiring loss, 250W 24V panels

Result: 6×250W panels, 600VA inverter

Example 2: Small Home Setup

Appliances: TV, fridge, lights, fans, phone charging

System: 24V DC, 15% wiring loss, 300W 24V panels

Result: 8×300W panels, 1500VA inverter

Example 3: Shop Setup

Appliances: Lights, fans, POS system, refrigerator

System: 48V DC, 25% wiring loss, 400W 48V panels

Result: 12×400W panels, 3000VA inverter

System Components

Solar Panels

Types: Monocrystalline (highest efficiency), Polycrystalline, Thin-film

Efficiency: 15-22% for commercial panels

Lifespan: 25+ years with minimal degradation

Battery Bank

Types: Lead-acid (flooded, AGM, Gel), Lithium-ion

Sizing: 2-3 days of autonomy recommended

DoD: Lead-acid: 50%, Lithium: 80-90%

Inverters

Types: Pure sine wave (recommended), Modified sine wave

Efficiency: 85-95% for quality inverters

Features: MPPT tracking, grid-tie capability

Charge Controllers

Types: PWM (basic), MPPT (high efficiency)

Efficiency: MPPT: 93-97%, PWM: 70-80%

Features: Temperature compensation, load control

Electrical Load Configuration

Solar System Parameters

Inverter Parameters

Solar Panel Options

Calculation Results

Daily Energy Consumption

Solar Panel Requirements

Inverter Requirements

Solar Panel Array Configuration

System Flow Diagram

System Summary

Step-by-Step Calculations

Example Configurations

Example 1: Home Office Setup

Example 2: Small Home Setup

Example 3: Shop Setup

System Components

Solar Panels

Battery Bank

Inverters

Charge Controllers