Solar String Voltage Calculator
Check cold solar string Voc, voltage headroom, max safe panels, and optional hot MPPT range from panel and inverter specs.
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Solar Panel Series and Parallel Calculator
Calculate solar array voltage, current, watts, cold Voc, and controller headroom for series-parallel panel wiring.
PWM vs MPPT Solar Calculator
Compare PWM and MPPT solar output, daily extra energy, and controller amp ratings from your panel label and battery voltage.
MPPT Charge Controller Calculator
Estimate the MPPT controller output-current rating your solar array needs and compare an existing controller with the estimate.
Solar Charge Controller Size Calculator
Estimate solar charge controller amps, next common size, and optional cold-weather PV voltage headroom for a DIY solar setup.
Days to Years Months and Days Converter
Convert days to years, months, and days with a fixed split or a real-calendar split from a start date.
Seconds to Minutes and Seconds Converter
Convert seconds to minutes and seconds, clock format, decimal minutes, and decimal hours with rounding controls.
Hours to Days and Hours Converter
Convert hours to days plus leftover hours, or days and hours back to total hours with custom day length and rounding.
Minutes to Hours and Minutes Converter
Convert total minutes, hours plus minutes, or decimal hours with clear rounding notes and HH:MM duration output.
Cups to Pints and Quarts Converter
Convert cups to pints, quarts, fluid ounces, milliliters, and a recipe-friendly kitchen mix in one step.