SolarToolsAll calculators
51 focused tools across 12 categories. Click any card to open the live calculator.
Solar Panel Sizing Calculator
Calculate how many panels you need based on energy usage, location, and panel wattage.
Open calculator →Solar Savings Calculator
25-year savings projection with inflation, degradation, and net metering.
Open calculator →Solar Panel Tilt & Angle Calculator
Find the optimal panel tilt and azimuth for your latitude and seasonal needs.
Open calculator →Solar Inverter Sizing Calculator
Size your solar inverter correctly — string vs microinverter, DC/AC ratio, and clipping losses.
Open calculator →Voltage Drop Calculator (Solar Wire Sizing)
Size your solar DC wiring correctly — prevent voltage drop and energy loss.
Open calculator →Roof Solar Potential Calculator
Evaluate your roof's solar potential — orientation, tilt, shading, and usable area.
Open calculator →Solar Payback Calculator
How many years until your solar panels pay for themselves? State-by-state estimates.
Open calculator →Peak Sun Hours Lookup
Find the average peak sun hours for your location — by state, city, or region.
Open calculator →Solar String Design Calculator
Calculate how many panels per string and how many strings for your inverter.
Open calculator →Solar Panel Efficiency Calculator
Real-world vs rated panel efficiency — temperature, soiling, and system losses.
Open calculator →Battery Storage ROI Calculator
Payback period for home battery systems based on your rates, usage, and battery cost.
Open calculator →Battery Capacity Calculator (Off-Grid)
How much battery capacity do you need for off-grid or backup power?
Open calculator →EV Charging Cost Calculator
Compare charging costs vs petrol or diesel, with per-mile and annual savings.
Open calculator →EV Range Calculator
Realistic range estimate accounting for speed, temperature, terrain, and driving style.
Open calculator →EV Total Cost of Ownership Calculator
Real 5-year cost: purchase, fuel, maintenance, insurance, depreciation for EV vs petrol.
Open calculator →Home EV Charger Installation Cost Estimator
What will it cost to install a Level 2 EV charger at home? Panel, wiring, distance, permits.
Open calculator →EV Road Trip Planner
Plan your EV road trip — charging stops, drive time, and total trip duration.
Open calculator →EV Solar Charging Calculator
How many solar panels does it take to charge your EV? Enter daily driving distance and panel specs.
Open calculator →Solar + EV Combined System Sizing Calculator
Size a single solar system that powers both your home and your EV. One roof, one system, two loads.
Open calculator →EV Battery as Home Backup (V2H/V2G) Calculator
Your EV has a 60-100 kWh battery. How long can it power your home during an outage or loadshedding?
Open calculator →EV vs Gas Payback with Solar Calculator
True EV payback when you charge with solar vs grid vs petrol. The solar-charged EV often wins by $10k+.
Open calculator →Home Charger Sizing with Solar Calculator
Match your EV charger power to your solar output. Level 1, Level 2 (7.2kW), or Level 2 (11.5kW)?
Open calculator →Appliance Wattage Lookup
Searchable database of common household appliance wattages with daily usage and category filters.
Open calculator →Geyser Timer Savings Calculator (South Africa)
How much will a geyser timer or blanket save on your SA electricity bill?
Open calculator →Pool Pump Savings Calculator
Variable-speed vs single-speed pool pump — annual savings and payback.
Open calculator →Lighting Savings Calculator
LED vs CFL vs incandescent — annual savings, payback, and bulb count.
Open calculator →Appliance Running Cost Calculator
How much does any appliance cost to run? Enter wattage, hours, and your rate.
Open calculator →Standby Power Cost Calculator
How much is vampire power costing you? Find and eliminate phantom loads.
Open calculator →Appliance Upgrade Payback Calculator
Is it worth replacing an old appliance? Compare old vs new and find the payback.
Open calculator →Light Bulb Savings Calculator
How much do you save switching to LED? Enter your bulbs and see the instant payback.
Open calculator →Time-of-Use Rate Optimizer
When to run appliances based on peak and off-peak electricity pricing.
Open calculator →Time-of-Use Plan Comparison
Compare TOU vs flat-rate electricity plans — which saves you more?
Open calculator →Off-Grid System Designer
Size a complete off-grid solar + battery + generator system for true energy independence.
Open calculator →Residential Wind Turbine Calculator
Size a small wind turbine for your property — production, cost, and payback.
Open calculator →Heat Pump Payback Calculator
Compare heat pump vs gas or oil heating costs and find the payback period.
Open calculator →Water Heating Cost Calculator
Compare electric tank, heat pump, gas, and tankless water heater costs.
Open calculator →Heat Pump Sizing Calculator
Size your heat pump correctly by home size, climate, and insulation quality.
Open calculator →Solar Water Heater Calculator
Size a solar water heating system and calculate savings vs electric or gas.
Open calculator →Electricity Bill Estimator
Estimate your monthly electricity bill based on appliance usage and your local rate.
Open calculator →Electricity Bill Breakdown Calculator
What's actually in your electricity bill? Decode every charge and find savings.
Open calculator →Energy Audit Calculator
Identify where your electricity spend goes, room by room, load by load.
Open calculator →CO₂ & Carbon Savings Calculator
How much CO₂ do you save with solar, an EV, or a heat pump? See your impact in tons and trees.
Open calculator →2026 Solar Incentive & Net Cost Calculator
Calculate your true net solar cost using state rebates, SRECs, and any incentives you qualify for.
Open calculator →Section 12B Solar Tax Calculator (South Africa)
Calculate your SARS Section 12B/12BA accelerated depreciation for solar in South Africa.
Open calculator →Solar Loan vs Cash Purchase Calculator
Compare financed vs cash-paid solar over 25 years. APR, opportunity cost, and break-even.
Open calculator →Solar Lease vs Buy Calculator
Compare leasing vs buying solar panels — 20-year total cost and savings.
Open calculator →Demand Charge Calculator (Commercial)
Calculate your commercial electricity demand charges and find savings opportunities.
Open calculator →Power Factor Calculator
Calculate power factor, apparent power, and correction capacitor size for your facility.
Open calculator →Microgrid Sizing Calculator
Size a solar + battery + generator microgrid for commercial or community facilities.
Open calculator →Solar Carport Calculator
Estimate costs, production, and ROI for commercial solar carports and canopies.
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