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Simple step-by-step field method, no complex tools needed.
1. Understand CT Marking
All CTs have:
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Arrow / S → L marking
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S = Source (Utility Grid side)
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L = Load (Home/Main Panel/FranklinWH side)
Rule: CT arrow must point toward the load / away from utility meter.
Step 1: Check Grid Import
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When home is using power (no PV excess):
aGate should show Grid Import (positive kW).
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If polarity is reversed:
aGate falsely shows Grid Export even when you’re buying power from the grid.
Step 2: Check PV Export (If site allows export)
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Midday high PV, low home load:
aGate should show Grid Export.
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If reversed:
It shows Grid Import even when sending power back to grid.
Step 3: No-Export System Quick Check
For HECO / NEM-MT no-export sites:
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Correct polarity: aGate holds grid power near 0kW (no export).
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Reversed polarity: aGate misreads flow, curtails PV unnecessarily or falsely shows export.
4. Swap Test (If Reading Backwards)
If import/export is flipped in aGate:
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Flip the CT 180° on the conductor (reverse arrow direction).
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Check aGate real-time power flow — it will correct immediately.
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Do same for both L1 and L2 CTs if both reversed.
5. Wiring Terminal Polarity (CT Leads)
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CT secondary wires (black/white) must land on the correct aGate CT input terminals.
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Swapping the two CT signal wires also reverses polarity, same as flipping the clamp.
Final, installer can commission the CT error in FranklinWH App
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