Fix ZeroDivisionError in simple_efficiency when load_loss=0 #2646
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fixes a
ZeroDivisionErrorinpvlib.transformer.simple_efficiencywhen
load_loss = 0.when
load_lossis zero, the transformer loss model reduces to a linearrelationship rather than a quadratic one. this PR handles that case
explicitly to avoid division by zero while preserving existing behavior
for
load_loss > 0.Fixes #2645