Use this free calculator to plan an array and panel count from daily energy and local peak sun hours. Change the load, starting surge, losses and battery limits to match your equipment.
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Every input includes a simple explanation.
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Motors and compressors can need extra power when they start.
Battery age, temperature and a high discharge rate can reduce delivered energy.
Use this as a planning range. Confirm continuous rating, peak rating and battery compatibility with the manufacturer and a qualified installer.
Daily energy is divided by local peak-sun hours and whole-system efficiency to produce a DC array size and panel count.
Use site-specific solar resource, roof orientation, shading, inverter limits and an installer survey before procurement.
Daylight hours are not peak-sun hours, and a shade-free noon does not prove full-day roof performance.
Array W = daily Wh × contribution ÷ peak sun hours ÷ system efficiency
Use site-specific solar resource, roof orientation, shading, inverter limits and an installer survey before procurement.
Daylight hours are not peak-sun hours, and a shade-free noon does not prove full-day roof performance.
Use this as a planning range. Confirm continuous rating, peak rating and battery compatibility with the manufacturer and a qualified installer.