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Ben Stanton avatar image
Ben Stanton asked

Data Showing incorrectly - 3 Phase Grid, 3 Phase PV (Enphase), 1 Phase ESS (MultiPlus-II)

We are using two ET340 Meters, one for the incoming Grid and one for the PV.

The calculations of AC Loads and Critical Loads are very obviously wrong.

Basic Drawing:

1652398687258.png

Tests Done:

With no PV

1652397371287.png

With just L1 Enphase inverters on:

1652397371323.png

With all 3 phases on:

1652397371363.png

If we change the Meter programming to AC Input (intentionally wrong but just testing):

1652397371399.png

1652397371436.png

Incorrect load showing on critical (as expected because the PV is physically on the AC output.)

It seems that the loads are being calculated wrong. L2 and L3 are showing critical load when there is no MultiPlus on there phases and the total calculated plus the grid export is higher than the Production by nearly double.

Try turning “Inverter AC output in use” which removed the Critical load calculation and the AC Load calculation still reads wrong values.

1652397371467.png

1652397371498.png

Anything else we can try?

ESSEnergy Metererror3 phaseenphase
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1652397371287.png (57.2 KiB)
1652397371436.png (46.6 KiB)
1652397371467.png (37.8 KiB)
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1 Answer
shaneyake avatar image
shaneyake answered ·

From what I can tell from your diagram, You have L1 on inverter output and L2 and L3 on inverter input essically as you don't have inverters on those phases.

Your PV meter can't be split, it is all on AC out or all on AC in. If you want correct readings you will need to wire L1 PV to Inverter input or install a separate ET112 for the PV on L1.

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Ben Stanton avatar image Ben Stanton commented ·
Ok, that is very interesting. Just to clarify: are you saying we should use 3 x ET112 Meters for the 3 phases of the Enphase Solar and assign the L1 to AC Out and L2 & 3 to AC IN?
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