Electrical

Estimate battery bank runtime from Ah, voltage, load watts, reserve charge, inverter efficiency, starting charge, and battery health.

Find peak kW from interval kWh, estimate demand charges, check load factor, and test savings from cutting your peak.

Calculate solar array watts, whole panel count, and estimated battery recharge time using your battery, panels, and peak sun hours.

Check cold solar string Voc, voltage headroom, max safe panels, and optional hot MPPT range from panel and inverter specs.

Calculate solar array voltage, current, watts, cold Voc, and controller headroom for series-parallel panel wiring.

Compare PWM and MPPT solar output, daily extra energy, and controller amp ratings from your panel label and battery voltage.

Estimate the MPPT controller output-current rating your solar array needs and compare an existing controller with the estimate.

Estimate solar charge controller amps, next common size, and optional cold-weather PV voltage headroom for a DIY solar setup.

Convert lumens to watts or watts to lumens, using bulb type, light per watt, energy cost, and fixture watt limit checks.