Physics

Find the next standard breaker size from amps or watts, including continuous-load rules and an optional wire ampacity check.

Estimate wire size from amps, voltage, one-way distance, material, voltage drop, power type, and ampacity settings.

Estimate solar battery charge time from battery size, charge percent, panel watts, losses, and peak sun hours per day.

Estimate solar panel kWh per day, month, year, and after aging from panel watts, panel count or total system size.

Estimate battery charging time from capacity or energy, charging rate, starting charge, target charge, and optional efficiency.

Estimate battery runtime from Ah, mAh, or Wh plus load in W, A, or mA, with efficiency, usable capacity, and duty cycle.

Convert Ah or mAh with voltage to Wh, or solve for Ah or voltage. Includes usable energy and an optional lithium travel note.

Convert Wh, kWh, or mWh to amp-hours using a battery’s nominal voltage. See matching mAh and watt-hours.

Convert kW to amps using voltage, circuit type, power factor, three-phase voltage basis, and optional efficiency.

Convert amps to estimated kW for DC, single-phase AC, or three-phase AC using voltage, power factor, and voltage basis.