Solar Transformer Sizing Calculator

Size step-up transformers for PV plants based on inverter output, voltage, and thermal considerations.

Input Parameters

Results

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Transformer Rating
kVA
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Primary Current
A
--
Secondary Current
A
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Temp Derating Factor
Note: Solar transformers experience reverse power flow. Use transformers rated for PV duty (K-factor for harmonics). Pad-mount typical for utility-scale.

Reference

Derating Factor: 1.0 @ 30°C, 0.96 @ 40°C, 0.88 @ 50°C Transformer Rating = ceil(Inverter kVA / Derating) Primary I = Rating × 1000 / (V_inv × √3) Secondary I = Rating / (V_grid × √3)