Solar Energy Calculators Made Simple
Accurately estimate your solar panel array size, battery storage capacity, ROI payback period, and monthly bill savings — 100% free with instant browser-based formulas.
Comprehensive Solar Calculators
Engineered with standard solar formulas to estimate system size, ROI, battery capacity, cable loss, and environmental impact.
Solar Panel Size Calculator
Calculate how many solar panels you need based on daily energy consumption (kWh) and peak sun hours.
Solar Energy Production Calculator
Estimate monthly and annual kWh generation using tilt, azimuth, peak sun hours, and system derate factors.
Solar Panel Roof Space Calculator
Calculate physical roof square footage (sq ft & m²) needed for a given solar system size.
Solar Panel Wattage Calculator
Convert Standard Test Conditions (STC) panel wattage into PTC and real-world operating power.
Optimal Solar Tilt & Orientation
Find optimal solar panel tilt angle and compass orientation based on your exact latitude.
Solar Panel Temperature Loss Calculator
Calculate power degradation percentage during extreme summer heat based on temperature coefficients.
Solar Shading & Derate Factor Calculator
Estimate annual energy production loss caused by partial tree shading, soiling, and snow.
Bifacial Solar Gain Calculator
Compute extra energy yield (10%-30%) generated by rear-side reflection based on ground albedo.
Solar ROI & Payback Calculator
Estimate return on investment, break-even payback period (years), and 25-year NPV cash flow.
Solar Electricity Savings Calculator
Project your monthly and 25-year cumulative utility bill savings after switching to solar power.
Solar Installation Cost Estimator
Calculate total system cost, $/Watt market rates, Federal Tax Credit, and net out-of-pocket price.
Solar Federal Tax Credit (ITC) Calculator
Calculate eligible 30% Federal Investment Tax Credit dollar amount under IRS Code Section 25D.
Solar Loan & Financing EMI Calculator
Calculate monthly loan payments, dealer origination fees, interest costs, and net monthly cashflow.
Solar Lease vs Buy Comparison Calculator
Compare 25-year financial returns, tax credit ownership, and home resale value between buying and leasing.
Solar PPA Savings Calculator
Project monthly expenses under a Solar Power Purchase Agreement with annual rate escalators.
Solar Property Value Increase Calculator
Estimate real estate equity added by owned solar panels based on NBER & LBNL market studies.
Solar SREC Revenue Calculator
Calculate annual cash income earned by selling Solar Renewable Energy Certificates in active state markets.
Net Metering Credit Calculator
Calculate credits for excess energy exported to grid under NEM 2.0 vs NEM 3.0 net billing.
Solar Battery Storage Sizing Calculator
Determine required battery storage capacity (kWh) for emergency outages or Time-of-Use peak shaving.
Battery Backup Run Time Calculator
Calculate how many hours or days a home battery will power essential loads during blackouts.
Battery C-Rate & Peak Discharge Calculator
Convert battery capacity (Ah/kWh) and C-rate into maximum continuous and peak surge kW output.
Battery Time-of-Use (TOU) Arbitrage
Calculate annual bill savings from charging batteries off-peak and discharging during expensive peak hours.
Battery Depth of Discharge (DoD) Calculator
Compare usable capacity vs cycle life between LiFePO4 Lithium (80-90% DoD) and Lead-Acid (50% DoD).
Off-Grid Battery Bank Voltage Calculator
Size 12V, 24V, or 48V battery banks and calculate series/parallel battery wiring configurations.
Solar Generator Sizing Calculator
Size portable power stations (EcoFlow, Jackery, Bluetti) and calculate solar recharge time.
Solar Inverter Sizing Calculator
Calculate optimal AC inverter wattage based on array DC capacity and target DC/AC ratio.
MPPT Charge Controller Calculator
Size MPPT controller voltage and amperage ratings with cold-weather Voc temperature correction.
Solar String Sizing Calculator
Calculate min and max panels per string to stay within inverter MPPT voltage windows.
Microinverter vs String Inverter Calculator
Compare equipment cost, labor, shading harvest advantage (+5-12%), and 25-year reliability.
Solar Inverter Efficiency Calculator
Calculate AC output power and conversion heat losses using CEC Weighted Efficiency metrics.
Solar Hybrid Inverter Calculator
Size hybrid inverters for simultaneous solar, battery bank, grid, and generator integration.
Solar DC Cable Size Calculator
Calculate minimum AWG or mm² DC wire gauge to keep string voltage drop under 2% (NEC 690.8).
Solar AC Output Wire Sizing Calculator
Size AC output conductors from inverter to main panel with 125% continuous duty rating.
Solar Combiner Box & Fuse Calculator
Determine string fuse requirements (NEC 690.9) and parallel array busbar ratings.
Solar Main Panel 120% Rule Calculator
Check if your electrical main panel can accept a solar backfeed breaker (NEC 705.12).
Solar Grounding & Wire Size Calculator
Size Equipment Grounding Conductors (EGC) and GEC wires for solar modules and racking.
Solar Rapid Shutdown Compliance Calculator
Verify array compliance with NEC 690.12 firefighter 30-second rapid shutdown voltage rules.
Solar Voc Temperature Correction Calculator
Calculate max cold-weather open circuit voltage to prevent exceeding NEC 600V/1000V limits.
Off-Grid Solar System Sizing Calculator
Complete suite for sizing panels, battery storage, MPPT, and generator for off-grid homes.
RV & Campervan Solar Calculator
Calculate solar panels, lithium Ah battery bank, and DC-DC alternator charging for campervans.
Marine & Boat Solar System Calculator
Size flexible or rigid solar panels, MPPT, and house batteries for sailboats and yachts.
Solar Powered Well Pump Calculator
Calculate solar panel wattage and VFD controller for deep submersible well water pumps.
Solar Shed & Workshop Calculator
Size compact solar kits for backyard sheds, workshops, man caves, and tiny cabins.
Solar Panel Charging Time Calculator
Calculate exact hours needed to charge any battery capacity using solar panels.
Solar Water Heater Sizing Calculator
Calculate collector area and storage tank size for solar thermal domestic hot water systems.
Solar Pool Heating Collector Calculator
Calculate solar pool collector panel surface area and water temperature rise.
Solar Air Heating Collector Calculator
Estimate room space heating BTU output and fuel savings from solar thermal air collectors.
Solar Panels for EV Charging Calculator
Calculate how many additional solar panels are required to power an Electric Vehicle 100% on sunshine.
Solar + EV Level 2 Charger Matching
Match real-time solar generation (kW) with smart EV charger amperage (16A-48A) without grid draw.
Bidirectional EV (V2H) Home Backup Calculator
Calculate how many days an Electric Vehicle battery can power a home when paired with solar panels.
Solar Carbon Footprint Offset Calculator
Calculate metric tons of CO2 avoided, trees planted equivalent, and EPA environmental impact metrics.
Solar Heat Pump Energy Calculator
Size solar arrays to offset 100% of electric heat pump heating and cooling consumption.
Commercial Solar Peak Demand Shaving
Calculate utility demand charge savings ($/kW) using commercial solar + battery energy storage.
Solar Farm Land Area & Acreage Calculator
Calculate required land area in Acres/Hectares for utility-scale solar farms (MW capacity).
Solar Performance Ratio (PR) Calculator
Compute official System Performance Ratio (PR %) and Capacity Factor using IEC 61724 metrics.
Levelized Cost of Energy (LCOE) Solar Calculator
Calculate lifetime levelized cost of solar electricity ($/kWh or $/MWh) over 25-30 years.
Ground Mount Solar Foundation Calculator
Calculate ballast block weight and driven pier post depth based on ASCE 7 wind load specs.
California NEM 3.0 Solar + Battery Calculator
Calculate solar + battery payback under California CPUC Net Billing avoided cost export rates.
Texas Free Nights Battery Arbitrage Calculator
Calculate monthly savings in Texas ERCOT market by charging batteries for free at night.
Florida Net Metering & Hurricane Backup
Calculate FPL 1:1 net metering savings combined with hurricane outage battery backup duration.
Solar Panel 25-Year Degradation Estimator
Model year-by-year output degradation over 25 years based on panel tech (PERC, TOPCon, HJT).
Solar Panel Soiling & Cleaning ROI Calculator
Calculate annual revenue lost to dust/soiling and determine if professional cleaning pays for itself.
Solar Inverter Replacement Cost Calculator
Estimate replacement cost and timing (Years 10-15) over a 25-year system lifecycle.