Free Solar Tools

16 free tools to plan, size, and wire your off-grid solar system.

Design

Solar Kit Designer

Choose your panels, batteries, chargers and inverter. Get a compliant wiring diagram and full parts list automatically.

Start Designing

Design

Roof Sizer

Upload your roof dimensions and see which panels fit. Drag and drop to plan your layout.

Try Roof Sizer

Design

Appliance Calculator

Enter your appliances and usage patterns. Get your daily power requirements and recommended battery size.

Calculate Now

Panels & Array

String Calculator

Calculate optimal series/parallel wiring configurations for your solar panels with temperature-adjusted analysis per AS/NZS standards.

Calculate Strings

Panels & Array

Controller Compatibility

Enter your MPPT charge controller specs and instantly see all compatible panel configurations with utilisation metrics.

Check Compatibility

Panels & Array

Solar Panel Output Estimator

Estimate daily, monthly, and yearly solar energy production based on panel specs, location, orientation, and system losses.

Estimate Output

Battery & Charging

Battery Bank Sizer

Calculate the right battery bank size for your off-grid system based on daily energy usage, autonomy days, and battery specs.

Size My Bank

Battery & Charging

Battery Charge Time Calculator

Estimate how long it takes to charge your battery bank from solar, shore power, or alternator sources.

Calculate Time

Battery & Charging

AC-DC Charger Selector

Answer a few quick questions about your battery system and get matched with the right shore-power charger.

Find My Charger

Battery & Charging

DC-DC Charger Sizer

Select the right DC-DC charger for alternator charging based on your battery bank, driving habits, and system voltage.

Size DC-DC

Load & Inverter

Daily Load Calculator

List your appliances and calculate total daily energy consumption. Includes common presets for campervan, RV, and off-grid living.

Calculate Loads

Load & Inverter

Inverter Sizing Tool

Calculate the right inverter size based on your AC loads, surge requirements, and system voltage. Get matched with compatible inverters.

Size Inverter

Wiring & Protection

Wire Size Calculator

Find the correct wire gauge for your DC circuit based on current, voltage, distance, and acceptable voltage drop.

Calculate Wire

Wiring & Protection

Voltage Drop Calculator

Calculate voltage drop across your cable runs. Supports copper and aluminium conductors with temperature adjustment.

Calculate Drop

Wiring & Protection

Fuse & Breaker Sizer

Calculate the correct fuse or circuit breaker rating for your DC circuit. Ensures protection is rated between load current and wire ampacity.

Size Protection

Wiring & Protection

Cable Lug & Connector Selector

Match your cable size to the correct lug, ring terminal, or bootlace ferrule. Includes crimp tool recommendations.

Find Connectors