Home Energy Calculators
Calculate solar production, battery runtime, electrical demand, EV charging cost, heat-pump energy use, and backup-power needs. Every calculator includes the formula, input guidance, limitations, FAQs, and related tools.
Solar Calculators
Plan residential solar capacity, production, panel count, PV strings, roof area, exports, payback, storage, and EV charging energy.
11 calculators BATTBattery Calculators
Estimate battery runtime, charging time, current, usable energy, capacity conversions, expansion, degradation, and payback.
11 calculators ELECElectrical Calculators
Calculate inverter capacity, electricity cost, AC and DC current, power factor, voltage drop, and single- or three-phase power.
8 calculators EV CEV Charging Calculators
Estimate EV charging time, home and public charging cost, charger size, circuit demand, solar requirements, and tariff savings.
8 calculators HEATHeating & Cooling Calculators
Estimate heat-pump and mini-split operating cost, COP, heating comparisons, water-heater savings, degree days, and cooling expense.
7 calculators BACKBackup Power Calculators
Size generators, essential loads, portable power stations, UPS systems, whole-home batteries, and compare backup ownership costs.
7 calculatorsHow to use these calculators
Start with measured household or equipment data whenever possible. Review the assumptions shown on each page, test more than one scenario, and compare the result with manufacturer documentation and local requirements before making a purchase or installation decision.
Calculator results are estimates. They do not replace a site survey, electrical design, permit review, utility approval, equipment manual, or qualified professional assessment.