Free Solar Tools
16 free tools to plan, size, and wire your off-grid solar system.
Design
DesignSolar Kit Designer
Choose your panels, batteries, chargers and inverter. Get a compliant wiring diagram and full parts list automatically.
Start Designing
DesignRoof Sizer
Upload your roof dimensions and see which panels fit. Drag and drop to plan your layout.
Try Roof Sizer
DesignAppliance Calculator
Enter your appliances and usage patterns. Get your daily power requirements and recommended battery size.
Calculate NowPanels & Array
Panels & ArrayString Calculator
Calculate optimal series/parallel wiring configurations for your solar panels with temperature-adjusted analysis per AS/NZS standards.
Calculate Strings
Panels & ArrayController Compatibility
Enter your MPPT charge controller specs and instantly see all compatible panel configurations with utilisation metrics.
Check Compatibility
Panels & ArraySolar Panel Output Estimator
Estimate daily, monthly, and yearly solar energy production based on panel specs, location, orientation, and system losses.
Estimate OutputBattery & Charging
Battery & ChargingBattery 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 & ChargingBattery Charge Time Calculator
Estimate how long it takes to charge your battery bank from solar, shore power, or alternator sources.
Calculate Time
Battery & ChargingAC-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 & ChargingDC-DC Charger Sizer
Select the right DC-DC charger for alternator charging based on your battery bank, driving habits, and system voltage.
Size DC-DCLoad & Inverter
Load & InverterDaily Load Calculator
List your appliances and calculate total daily energy consumption. Includes common presets for campervan, RV, and off-grid living.
Calculate Loads
Load & InverterInverter Sizing Tool
Calculate the right inverter size based on your AC loads, surge requirements, and system voltage. Get matched with compatible inverters.
Size InverterWiring & Protection
Wiring & ProtectionWire Size Calculator
Find the correct wire gauge for your DC circuit based on current, voltage, distance, and acceptable voltage drop.
Calculate Wire
Wiring & ProtectionVoltage Drop Calculator
Calculate voltage drop across your cable runs. Supports copper and aluminium conductors with temperature adjustment.
Calculate Drop
Wiring & ProtectionFuse & 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 & ProtectionCable Lug & Connector Selector
Match your cable size to the correct lug, ring terminal, or bootlace ferrule. Includes crimp tool recommendations.
Find Connectors