solar system capacity calculator
Solar System Capacity Calculator
Convert between STC nameplate, PTC, and AC capacity ratings, and check your system's capacity factor.
Capacity Breakdown
PTC-Rated Capacity
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STC nameplate is used for marketing and labeling; PTC gives a more realistic performance estimate under typical operating heat.
DC:AC Ratio
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Ratios above 1.0 mean the array is intentionally oversized relative to the inverter, common in grid-tie design.
Effective AC System Capacity
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This is the practical export/grid-interconnection limit, since the inverter caps output regardless of DC nameplate.
Capacity Factor
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Typical solar capacity factors range 15-25%, reflecting that panels only produce near their nameplate rating during peak sun.
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