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Settings can lie; the utility meter cannot. These are the live tests that prove the sensing chain and the export control — run at commissioning and after any CT, meter or export rework.
For trained/authorized installers only. These tests switch real loads and open real breakers — brief the customer before starting.

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Before you start

  • System commissioned to the point of a live display; CT/meter physically per Direction & Location.
  • A steppable heavy load identified (geyser, iron, kettle-class) — per phase on Kent G3.
  • Eyes on both displays: the inverter’s screen and the utility meter.

The energy-flow witness test: grid on, PV off must read import — figure KNB-SVG-16

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Test 1 — Direction (convention-proof)

  1. Grid ON, PV OFF (DC switch open), battery idle.
  2. The display must show import — the house drawing from the grid.
  3. Step the heavy load: the grid figure rises, same sign.
Pass: import shown, correct sign on load steps. 📷 Fail: sign flipped or nonsense → CT reversed, wrong conductor, or wrong location — fix physically first per Direction & Location.

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Test 2 — Per-phase mapping (Kent G3)

  1. With Test 1 passed, step the known load on L1 only — the display’s L1 figure responds, L2/L3 stay flat.
  2. Repeat for L2, then L3.
Pass: each phase responds on its own reading — and only its own. 📷 Fail: response appears on a different phase → CT-to-phase or lead-to-terminal mismatch — see Meter & Phase Matching.

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Test 3 — Zero-export witness (export-limited sites)

  1. Export settings configured per the platform page (Kent M1 · Kent G3).
  2. Pick the harshest window available: PV high, site load minimised.
  3. Watch the utility meter — not only the inverter display — through several minutes of that condition, including a sudden load drop.
Pass: no sustained export above the set limit on the utility meter; only momentary blips on load steps. 📷 Fail: sustained export → Troubleshooting: Zero Export Failing (Kent M1 · Kent G3). [KNB-VAL-07 — on Kent M1 export-limited sites this witness is mandatory before sign-off]

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Record it

Each test gets a line in the commissioning record: condition, reading, photo. The settings snapshot then freezes the configuration these tests proved.

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Common mistakes

  • Testing with PV on — solar masks the import and the sign proof evaporates.
  • Watching the inverter display for Test 3 — the DISCOM reads the utility meter, so do you.
  • Per-phase test with the load on a multi-phase outlet — use a known single-phase load.
  • Passing Test 1 and skipping Test 2 on a three-phase site — direction right, phases crossed still fails silently.

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When to escalate