Several Orientations with Optimizer

[CivilNJ]

I am trying to understand/run an analysis of a rooftop system where the designer is using SolarEdge 33k US Inverter with P700 Optimizer and Hyundai HiS-S350TI Modules .

Using PVsyst version 6.63

The design jumps to two different tilt scenarios on one string and I believe that I have set it up properly but it seems to be unable to run the Simulation because one of the Sub-Arrays is too small (inverter is strongly oversized message). I have attached two screen grabs in the hopes that someone can direct me properly with this. Am I missing something or is this even possible? I just got off the phone with SolarEdge and the multi-tilt option shouldn't be an issue. I must be missing something in the PVsyst program.

 

[dtarin]

Is the overall system size 41.3kW DC, 33kW AC? If so, use fractional inputs option in both arrays.

[CivilNJ]

it is 41.65 kW DC and a 33.3 inverter, so yes.

I will try turning on the fractional usage.

Thank You.

[CivilNJ]

It seems like there is more to this than simply turning on the Fractional Inputs. I had originally tried to analyze this with only one string on multiple tilts - oops. Now including all 3 strings to this inverter. I just haven't done anything this complex before. When you enter the planned power, it sets the Fractional to 0.1 - does that need to be set to the actual fraction of the array for each segment?

Orientation parameters

Field type: Several orientations

2 orientations: tilt/azim = 5°/0°, 18°/0°,

Compatibility between System defintions

Orientation #1 tilt/azim = 5° / 0°

3 sub-arrays PNom = 37 kWp, modules area = 207 m²

Orientation #1: No Shading field defined

Orientation #2 tilt/azim = 18° / 0°

4 sub-arrays PNom = 41 kWp, modules area = 227 m²

Orientation #2: No Shading field defined

System parameters

7 sub-arrays defined

Sub-array #1 5 Degree String 1

Orientation #1Tilt/Azimut = 5.0° / 0.0°

PV modules: 1 strings of 34 modules in series, 34 total

Pnom = 350 Wp Pnom array = 12 kWp, Area = 67 m²

Inverters (33.3 kWac) 3 MPPT inputs, Total 10 kWa

Sub-array #2 18 Degree String 1

Orientation #2Tilt/Azimut = 18.0° / 0.0°

PV modules: 1 strings of 30 modules in series, 30 total

Pnom = 350 Wp Pnom array = 11 kWp, Area = 59 m²

Inverters (33.3 kWac) 1 MPPT inputs, Total 3 kWac,

The inverter power is strongly undersized.

Sub-array #3 18 Degree String 2

Orientation #2Tilt/Azimut = 18.0° / 0.0°

PV modules: 1 strings of 34 modules in series, 34 total

Pnom = 350 Wp Pnom array = 12 kWp, Area = 67 m²

Inverters (33.3 kWac) 1 MPPT inputs, Total 3 kWac,

The inverter power is strongly undersized.

Sub-array #4 5 Degree String 2

Orientation #1Tilt/Azimut = 5.0° / 0.0°

PV modules: 1 strings of 36 modules in series, 36 total

Pnom = 350 Wp Pnom array = 13 kWp, Area = 70 m²

Inverters (33.3 kWac) 2 MPPT inputs, Total 7 kWac,

The inverter power is strongly undersized.

Sub-array #5 18 Degree String 3a

Orientation #2Tilt/Azimut = 18.0° / 0.0°

PV modules: 1 strings of 32 modules in series, 32 total

Pnom = 350 Wp Pnom array = 11 kWp, Area = 63 m²

Inverters (33.3 kWac) 2 MPPT inputs, Total 7 kWac,

The inverter power is strongly undersized.

Sub-array #6 5 Degree String 3

Orientation #1Tilt/Azimut = 5.0° / 0.0°

PV modules: 1 strings of 36 modules in series, 36 total

Pnom = 350 Wp Pnom array = 13 kWp, Area = 70 m²

Inverters (33.3 kWac) 2 MPPT inputs, Total 7 kWac,

The inverter power is strongly undersized.

Sub-array #7 18 Degree String 3b

Orientation #2Tilt/Azimut = 18.0° / 0.0°

PV modules: 1 strings of 20 modules in series, 20 total

Pnom = 350 Wp Pnom array = 7.0 kWp, Area = 39 m²

Inverters (33.3 kWac) 1 MPPT inputs, Total 3 kWac,

The inverter power is strongly undersized.

Shading scene parameters

No shading scene defined

[dtarin]

Set the small array to 0.3, the larger to 0.7.

[CivilNJ]

I am definitely missing something and am under the gun now.

Throw out my original screen grabs. I now have 7 separate breakdowns of the original data.

SolarEdge 33k US Inverter with P700 Optimizer and Hyundai HiS-S350TI Modules

My strings/tilts are as follows:

String 1: 33 modules @ 5 degrees

String 1: 6 modules @ 18 degrees

String 2: 14 modules @ 18 degrees

String 2: 26 modules @ 5 degrees

String 3: 20 modules @18 degrees

String 3: 18 modules @ 5 degrees

String 3: 2 modules @ 18 degrees

I have two Orientations set up - 1 for 5 degrees and one for 18 degrees

I have 7 sub-arrays representing each of these string parts noted.

I have fractional inputs checked with the total or all seven = 1.0 inverter (0.2, 0.1,.., etc.)

I have tried setting each sub-array to the proper orientation for that section and tried it with the Mixed #1 and #2 settings.

Orientation parameters

Field type: Several orientations

2 orientations: tilt/azim = 5°/0°, 18°/0°,

Compatibility between System defintions

Orientation #1 tilt/azim = 5° / 0°

3 sub-arrays PNom = 37 kWp, modules area = 207 m²

Orientation #1: No Shading field defined

Orientation #2 tilt/azim = 18° / 0°

4 sub-arrays PNom = 41 kWp, modules area = 227 m²

Orientation #2: No Shading field defined

System parameters

7 sub-arrays defined

Sub-array #1 5 Degree String 1

Orientation #1Tilt/Azimut = 5.0° / 0.0°

PV modules: 1 strings of 34 modules in series, 34 total

Pnom = 350 Wp Pnom array = 12 kWp, Area = 67 m²

Inverters (33.3 kWac) 2 MPPT inputs, Total 7 kWac,

The inverter power is strongly undersized.

Sub-array #2 18 Degree String 1

Orientation #2Tilt/Azimut = 18.0° / 0.0°

PV modules: 1 strings of 30 modules in series, 30 total

Pnom = 350 Wp Pnom array = 11 kWp, Area = 59 m²

Inverters (33.3 kWac) 1 MPPT inputs, Total 3 kWac,

The inverter power is strongly undersized.

Sub-array #3 18 Degree String 2

Orientation #2Tilt/Azimut = 18.0° / 0.0°

PV modules: 1 strings of 34 modules in series, 34 total

Pnom = 350 Wp Pnom array = 12 kWp, Area = 67 m²

Inverters (33.3 kWac) 1 MPPT inputs, Total 3 kWac,

The inverter power is strongly undersized.

Sub-array #4 5 Degree String 2

Orientation #1Tilt/Azimut = 5.0° / 0.0°

PV modules: 1 strings of 36 modules in series, 36 total

Pnom = 350 Wp Pnom array = 13 kWp, Area = 70 m²

Inverters (33.3 kWac) 2 MPPT inputs, Total 7 kWac,

The inverter power is strongly undersized.

Sub-array #5 18 Degree String 3a

Orientation #2Tilt/Azimut = 18.0° / 0.0°

PV modules: 1 strings of 32 modules in series, 32 total

Pnom = 350 Wp Pnom array = 11 kWp, Area = 63 m²

Inverters (33.3 kWac) 2 MPPT inputs, Total 7 kWac,

The inverter power is strongly undersized.

Sub-array #6 5 Degree String 3

Orientation #1Tilt/Azimut = 5.0° / 0.0°

PV modules: 1 strings of 36 modules in series, 36 total

Pnom = 350 Wp Pnom array = 13 kWp, Area = 70 m²

Inverters (33.3 kWac) 1 MPPT inputs, Total 3 kWac,

The inverter power is strongly undersized.

Sub-array #7 18 Degree String 3b

Orientation #2Tilt/Azimut = 18.0° / 0.0°

PV modules: 1 strings of 20 modules in series, 20 total

Pnom = 350 Wp Pnom array = 7.0 kWp, Area = 39 m²

Inverters (33.3 kWac) 1 MPPT inputs, Total 3 kWac,

The inverter power is strongly undersized.

Am I missing something very obvious or it this not the correct logic?

Any assistance appreciated.

Jim