Solar Power, Electrical & Energy Cost Calculators
Calculate solar panel array output, battery backup runtime, appliance power bills, wire gauge sizes, and electrical load safely.
Estimate the solar array size and number of panels your home needs.
Daily, monthly, and yearly energy from a set of solar panels.
How many years a solar system takes to pay for itself.
Pick the right charge controller current for your panels and battery bank.
How long a battery can power a load.
Size a battery bank for off-grid or backup power.
Estimate how long a battery takes to charge.
How many times a power bank can charge your phone.
Savings from replacing old bulbs with LEDs.
What devices cost you while idle or on standby.
Will a more efficient appliance pay for itself?
Add up the daily energy use of several appliances.
Real, apparent, and reactive power from volts and amps.
Power in kW and kVA for a three-phase supply.
Convert kVA to kW and current for single or three-phase supplies.
Capacitor size needed to improve power factor.
Voltage drop and power loss along a cable.
Minimum cable cross-section for an allowed voltage drop.
Choose a generator size from running and starting loads.
Total resistance of resistors in series and in parallel.
Series resistor value for an LED.
Energy and charge stored in a capacitor.
Secondary voltage and currents from a transformer turns ratio.
Hydraulic and shaft power needed to pump water.
Estimate power from a wind turbine.
Heat loss through walls, windows, or a roof, and the heating cost.
Cooling capacity needed for a room.
Monthly electricity cost of running an air conditioner.
Energy and cost to heat your daily hot water.
CO₂ emissions from your electricity use.
About these Energy calculators
toolshere.biz.id has 30 free energy calculators. Calculate solar panel array output, battery backup runtime, appliance power bills, wire gauge sizes, and electrical load safely. Popular topics include solar output, power bill, battery storage, amps to watts and wire gauge. Every tool runs in your browser, so the numbers you type stay on your device.
Solar panel generation, battery amp-hours, appliance kilowatt-hours, and wiring load. Most tools in this category rely on watt's law & kilowatt-hour electricity cost; the Energy calculation guide walks through a worked example step by step.
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