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Solar calculators

Size your solar array, choose the right MPPT or PWM charge controller, check string voltages on cold mornings and set the best tilt angle. Built for small off-grid systems from a single van panel up to a cabin array.

Solar panel size calculatorHow many watts of solar (and how many panels) you need.Solar panel output calculatorDaily Wh, Ah and monthly kWh a panel or array really produces.Solar charge controller size calculatorPick the right MPPT or PWM controller current rating.MPPT string voltage calculatorCheck panels in series won't exceed your controller's max voltage when cold.Solar panels in series or parallel calculatorArray voltage, current and watts for any series/parallel layout.Solar panel tilt angle calculatorBest panel angle for year-round, summer and winter use.Off-grid solar system calculatorSize batteries, panels, controller and inverter in one go.Solar panel temperature loss calculatorHow much output a solar panel loses when it gets hot.How many solar panels fit on my roof?How many panels fit on a van, RV or shed roof, and total watts.Daylight hours and sun angle calculatorDay length, noon sun height and best panel angle for any date.

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