Interactive home-energy tools
Home Energy Calculators
Calculate solar production, battery runtime, electrical demand, EV charging, heating and cooling costs, and backup-power requirements using transparent assumptions and practical guidance.
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Solar Calculators
Plan residential solar capacity, production, panel count, PV strings, roof area, exports, payback, storage, and EV charging energy.
21 calculators
Battery Calculators
Estimate battery runtime, charging time, current, usable energy, capacity conversions, expansion, degradation, and payback.
17 calculators
Electrical Calculators
Calculate inverter capacity, electricity cost, AC and DC current, power factor, voltage drop, and single- or three-phase power.
12 calculators
EV Charging Calculators
Estimate EV charging time, home and public charging cost, charger size, circuit demand, solar requirements, and tariff savings.
10 calculators
Heating & Cooling Calculators
Estimate heat-pump and mini-split operating cost, COP, heating comparisons, water-heater savings, degree days, and cooling expense.
11 calculators
Backup Power Calculators
Size generators, essential loads, portable power stations, UPS systems, whole-home batteries, and compare backup ownership costs.
9 calculators