DG Phase Balance Checker
Three-phase current unbalance %, estimated neutral current and extra I²R losses.
Generators tolerate unbalance worse than the grid — most gensets derate sharply beyond 10% and trip beyond 25%. Verify the phase split before the next outage finds it for you.
Unbalance = max deviation ÷ average. Beyond 10%, the loaded phase ages the transformer winding faster while neutral current heats the conductor nobody monitors. Rebalancing is free — move single-phase consumers between phases at the pillar box.
Planning estimate only — interconnection, protection settings and compliance must be reviewed and signed off by a licensed electrical engineer and your utility before energisation.
Use the free DG Phase Balance Checker online — Three-phase current unbalance %, estimated neutral current and extra I²R losses. Runs instantly in your browser: no signup, no upload, mobile-friendly.
About DG Phase Balance Checker
Generators tolerate unbalance worse than the grid — most gensets derate sharply beyond 10% and trip beyond 25%. Verify the phase split before the next outage finds it for you.
How to use DG Phase Balance Checker
- 1Clamp and enter the three phase currents at peak.
- 2Read unbalance %, estimated neutral current and extra losses.
- 3Rebalance single-phase connections and re-measure.
Why use DG Phase Balance Checker?
- ✓Unbalance %, neutral current and extra losses from three clamp readings
- ✓The free fix (moving connections) quantified before any spend
- ✓Harmonic-neutral warning for modern electronic loads
- ✓10% guideline enforced with verdicts
Frequently asked questions
What is current unbalance and why does it matter?+
Max deviation from the average phase current, as a percentage. Beyond ~10%, the loaded phase overheats its winding share (aging the transformer asymmetrically), the neutral carries real current, and I²R losses rise quadratically. It's the most common, most fixable distribution defect.
Why is my neutral carrying so much current?+
Two causes: unbalanced single-phase loads (the vector remainder lands on the neutral — this tool estimates it) and triplen harmonics from electronic loads, which ADD arithmetically in the neutral regardless of balance. If measured neutral exceeds this tool's estimate, harmonics are the difference.
How do I fix phase unbalance?+
Redistribution: move single-phase consumers/loads between phases at the pillar box or panel until peak-hour readings converge — typically an afternoon's work with a clamp meter, costing nothing. Re-measure at the same hour; balance shifts with the daily load pattern.
Does unbalance really age a transformer faster?+
Yes — heating follows each winding's own current squared: at 20% unbalance, the heavy phase runs ~44% more I²R heat than balanced operation would give it, and the hot-spot lives in that winding. The transformer's life is its hottest phase's life.
Embed DG Phase Balance Checker on your website
Want DG Phase Balance Checkeron your own site? Paste this snippet into any HTML page — it's free, with no API key or sign-up. The tool loads in an iframe and keeps working exactly as it does here.
<iframe src="https://tooljolt.com/tools/dg-phase-balance-checker" width="100%" height="640" style="border:1px solid #e5e7eb;border-radius:12px;max-width:680px" title="DG Phase Balance Checker — ToolJolt" loading="lazy"></iframe>Related Energy tools
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