Free Solar Calculators forSouth Africa
Size your solar system, inverter & battery. Get instant cost estimates, savings projections, and payback periods.
Solar System Sizer
Enter your kWh usage → get panel count, inverter size, battery capacity & cost estimate
Inverter & Battery Calculator
Select appliances → get inverter kVA, battery size & cost estimate for load shedding
Solar Savings Calculator
Enter your bill → see 10-year savings, payback period & ROI vs Eskom
Why use GridCalc?
Built for South Africa
SA-specific tariffs, peak sun hours, appliance data, and pricing
No sign-up required
Instant results. No email walls, no tracking, no data collection
Mobile-first
Works perfectly on phones — check your solar size on the go
Shareable results
Share your results on WhatsApp with a single click
Use these free tools to size solar systems for your clients. Then send professional quotes with The Trade Kit — free invoicing and job management for SA tradespeople.
Try The Trade Kit — free