Determine when solar PV generation exceeds local load causing reverse power flow on the distribution transformer.
Input Parameters
Results
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Minimum Load
kW
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Max Reverse Flow
kW
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Reverse Flow % of Rating
%
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Risk Level
Note: Most distribution transformers can handle 100% reverse flow but voltage regulation may be affected. Minimum load typically occurs on weekends and holidays. IEEE C57.91 covers transformer loading.
Reference
Minimum Load = Connected Load x Min Load Factor
Max Reverse Flow = Connected PV - Min Load
Reverse % = Max Reverse / Transformer Rating x 100
Risk: <50% low, 50-100% medium, >100% high