Plan your solar setup the way an engineer would — with real numbers.
fourteen free calculators built from eight years of hands-on solar troubleshooting. Size your system, estimate savings, and check payback — without the jargon.
Plan Your System
Start here — size and forecast your setup.
Solar Load Calculator
Add up your daily appliance usage to build an accurate load profile.
Calculate LoadSolar Size Calculator
Find the right system size in kW based on your daily energy usage.
Calculate SizeSolar Production Calculator
Forecast monthly and yearly energy output for your location.
Calculate ProductionRoof & Panels
Check fit, shade and placement before you install.
Roof Suitability Calculator
Evaluate roof angle, direction and structural capacity for solar.
Analyze RoofSolar Shade Calculator
See how nearby trees or buildings affect panel output through the day.
Check ShadeSolar Panel Placement Calculator
Plan optimal panel layout and spacing across your roof area.
Plan PlacementClinometer
Measure your roof’s tilt angle right from your phone.
Measure AngleSavings & Finance
See what solar earns you back over time.
Solar Savings Calculator
Estimate monthly and yearly savings from your electricity bill.
Calculate SavingsNet Metering Calculator
Work out credits earned from excess energy sold back to the grid.
Calculate CreditsSolar ROI Calculator
See your payback period and long-term return before you buy.
Calculate ROIBattery & Off-Grid
Size backup power and go off-grid with confidence.
Battery Backup Calculator
Size battery capacity for backup power and energy independence.
Size BatteryOff-Grid Solar Calculator
Design a complete off-grid system with battery and generator needs.
Design Off-GridSolar Irrigation Calculator
Find the best solar irrigation setup for your farm and cut costs.
Calculate IrrigationEnvironmental
Measure the impact of going solar.