solar energy Calculators
Last updated: May 2026
Solar Panel Output Calculator
Calculate the daily energy output (kWh) of a solar panel from its rated wattage, daily peak-sun hours, and efficiency.
Solar Savings Calculator
Calculate monthly bill savings from a solar PV system by multiplying solar production by your electricity rate.
Solar Payback Period Calculator
Calculate how many years a solar PV system takes to pay back its net upfront cost through annual electricity bill savings.
Solar Battery Size Calculator
Calculate required battery capacity (kWh) to back up a home for a chosen number of days at a given daily energy usage and battery depth-of-discharge limit.
Solar Panel Area Calculator
Calculate the roof or ground area required for a target solar capacity given panel efficiency and local solar irradiance.
Solar Carbon Offset Calculator
Estimates the annual CO2 emissions avoided by your solar PV system, using your yearly production in kWh and the grid emission factor it displaces.
Optimal Solar Panel Angle Calculator
Estimates the optimal fixed tilt angle for a solar panel based on your latitude and the season you want to optimize for.
Solar Wire Size Calculator
Estimates the minimum copper wire cross-section needed for a solar DC run based on system current, run length, and tolerable voltage drop.
Solar Inverter Size Calculator
Estimates the recommended AC inverter rating for a solar array based on DC capacity, target DC-to-AC ratio, and headroom for future expansion.
Solar Panel Efficiency Calculator
Computes the operating efficiency of a solar panel from its measured output, surface area, and incident irradiance.
Solar Panel Savings Calculator
Estimate your annual solar savings and net yearly return after accounting for installation costs and the federal tax credit.
Solar Battery Sizing Calculator
Find the minimum battery bank capacity needed to power your home through cloudy days or outages.
Solar Panel Tilt Angle Calculator
Find the ideal mounting angle for your solar panels based on your geographic latitude and the season you want to optimize.
Solar Wire Sizing Calculator
Determine the correct AWG wire gauge for any run in your solar array based on current, distance, voltage, and temperature.
Solar Load Calculator
Calculate the total daily energy demand of your home's lighting, appliances, and HVAC to correctly size a solar system.
Net Metering Calculator
Estimate your monthly solar bill under time-of-use net metering.
Solar Lease vs Buy Calculator
Compare the true 20-year cost of leasing solar panels versus buying them outright with tax credits.
Solar Shading Loss Calculator
Quantify how much annual solar energy you lose to roof shading.
Solar Panel System Sizing Calculator
Find out exactly how many solar panels your home needs to cover its electricity usage.
Solar Roof Area Calculator
Determine how many solar panels fit on your roof by entering its dimensions, pitch angle, and usable area percentage.
Solar Panel Angle Calculator
Find the ideal tilt angle for your solar panels based on your latitude, season, and roof pitch.
Solar Energy Production Calculator
Estimate how many kilowatt-hours your solar system will produce each year, accounting for efficiency losses and panel aging.
Net Metering Savings Calculator
Calculate your monthly solar bill savings under net metering by comparing what you avoid paying in retail electricity costs against any export credits and fixed fees.
Solar Loan Payment Calculator
Determine your fixed monthly payment for a solar loan and see how the federal tax credit and monthly electricity savings affect your true net cost.
Solar Panel Degradation Calculator
Project how much energy your solar panels will produce in any future year as their output gradually declines with age.
Solar Carbon Footprint Calculator
Estimate the total CO₂ emissions avoided by a solar panel system over its lifetime.
Solar Panel System Size Calculator
Determine how many kilowatts of solar panels you need to meet a chosen percentage of your electricity bill.
Solar Battery Storage Calculator
Find the battery bank capacity (in amp-hours) needed to power your home for a set number of backup days.
Solar Panel Angle Calculator
Find the ideal tilt angle for your solar panels based on your latitude and the season you want to optimize for.
Solar Wire Size Calculator
Calculate the minimum copper wire cross-sectional area (in circular mils) needed for a solar DC run to keep voltage drop within acceptable limits.
Net Metering Calculator
Estimate your monthly electricity bill when solar panels feed surplus energy back to the grid.
Solar Carbon Offset Calculator
Quantify the total CO₂ emissions avoided over the lifetime of your solar installation.
Solar Financing Calculator
Compare the monthly loan payment and total interest cost of financing a solar installation versus paying cash.
Solar Panel Cost Savings Calculator
Project your total 25-year net savings from going solar, accounting for electricity rate inflation and panel degradation.
Solar System Sizing Calculator
Calculate the solar array size in kilowatts needed to cover a chosen percentage of your electricity usage.
Solar Battery Backup Calculator
Determines how many kilowatt-hours of battery capacity you need to keep essential appliances running during a grid outage.
Net Metering Calculator
Calculates your monthly electric bill credit when your solar panels overproduce and the cost when they fall short, factoring in net metering rates and fixed fees.
Solar Carbon Footprint Calculator
Estimates the lifetime net CO₂ reduction (in tons) from a solar panel system by comparing grid emissions avoided against manufacturing emissions.
Solar Roof Analysis Calculator
Estimates the peak kilowatt capacity a rooftop can support based on available area, tilt, orientation, and shading.
Solar Financing Comparison Calculator
Compares the true monthly net cost of financing a solar installation with a loan versus the monthly savings it generates, helping you decide whether to pay cash, take a loan, or lease.
Solar Inverter Sizing Calculator
Determines the right inverter size for a solar array by factoring in panel capacity, orientation, climate, and DC:AC ratio.
Solar Battery Backup Size Calculator
Calculates the total battery capacity (kWh) needed to cover your home's energy use for a set number of backup days.
Solar Panel Roof Area Calculator
Estimates how many solar panels fit on a roof section and calculates expected power output, accounting for usable area, tilt, and shading.
Solar Net Metering Savings Calculator
Calculates your annual savings from net metering by comparing solar production to consumption and valuing surplus energy sold back to the grid.
Solar Water Heater Savings Calculator
Estimates annual energy savings from a solar water heater based on household size, fuel type, solar fraction.
Off-Grid Solar System Calculator
Size your off-grid solar system by calculating required solar panels, battery bank, and inverter capacity.
Solar Panel Angle Optimizer Calculator
Find the optimal tilt and orientation for your solar panels to maximize annual energy output based on your latitude and roof direction.
Solar Panel System Sizing Calculator
Calculate exactly how many solar panels your home needs based on your electricity bill, local sun exposure, panel wattage, and desired offset.
Solar Payback Period Calculator (with Incentives)
Determine how many years your solar installation takes to break even after applying the federal tax credit, state rebates, and your local electricity rate.
Home Battery Sizing Calculator
Size a home battery storage system to cover a specific backup load for a chosen number of days without grid or solar input, accounting for depth of discharge, round-trip efficiency, and a safety reserve.
Appliance Energy Cost Calculator
Calculate the true annual electricity cost of any appliance using its wattage, daily usage hours, days per week, your electricity rate, and the number of units.
Heat Pump Savings Calculator (vs Gas or Oil)
Compare the annual heating cost of a heat pump against a gas or oil furnace using your heat demand, the heat pump's COP, furnace efficiency, and both fuel prices.
EV Home-Charging Solar Offset Calculator
Calculate how many kilowatts of extra solar capacity you need to cover your EV's home charging.