diff --git a/Utilities/Shading.py b/Utilities/Shading.py
index ee82e76..1052ac5 100644
--- a/Utilities/Shading.py
+++ b/Utilities/Shading.py
@@ -4,10 +4,6 @@ import logging
 import math
 from tqdm import tqdm
 
-from ladybug_geometry.geometry3d.pointvector import Point3D, Vector3D
-from ladybug_geometry.geometry3d.plane import Plane
-from ladybug_geometry.geometry3d.polyface import Polyface3D
-
 import pvlib
 
 from Utilities.Processes import (
@@ -23,6 +19,19 @@ def define_grid_layout(c):
         c["array"]["system_size"], c["panel"]["peak_power"]
     )
 
+    # calculate pitch
+    pitch = c["array"]["spacing"] + c["panel"]["dimensions"]["thickness"]
+    # calculate minimum pitch if we don't want panel overlap at all
+    min_pitch = c["panel"]["dimensions"]["length"] * math.cos(
+        c["array"]["tilt"] / 180 * math.pi
+    )
+    if pitch < min_pitch:
+        logger.warning(
+            f"Spacing is less than minimum pitch. Setting spacing to {min_pitch}."
+        )
+        pitch = min_pitch
+    logger.info(f"Pitch between panels: {pitch}m")
+
     # get maximum number of panels based on spacing and dimensions
     max__panels_per_row = np.floor(
         (
@@ -36,7 +45,7 @@ def define_grid_layout(c):
             c["environment"]["roof"]["dimensions"]["length"]
             - 2 * c["array"]["edge_setback"]
         )
-        / (c["array"]["spacing"] + c["panel"]["dimensions"]["thickness"])
+        / pitch
     )
     max_no_of_panels = max__panels_per_row * max_number_of_rows
     logger.info(
@@ -82,50 +91,7 @@ def define_grid_layout(c):
             "z": z,
         }
     )
-    return coordinates
-
-
-def create_panels(coordinates, c):
-    panel_width = c["panel"]["dimensions"]["width"]
-    panel_length = c["panel"]["dimensions"]["length"]
-    panel_thickness = c["panel"]["dimensions"]["thickness"]
-
-    # if viewed from above, and assumming the roof is a rectangle, the
-    # global origin is at the bottom left corner of the roof
-
-    # For a vertical panel:
-    # - The vertical direction (panel height) is along the Z-axis.
-    y_axis = Vector3D(0, 1, 0)  # points east, therefore front face is east facing
-
-    # - The horizontal direction along the panel's width.
-    #   Here, we assume the width runs in the positive X-direction.
-    x_axis = Vector3D(1, 0, 0)  # points north
-
-    panel_object = []
-    base_planes = []
-    for index, row in coordinates.iterrows():
-        # Create the bottom-left corner of the panel
-        panel_origin = Point3D(row["x"], row["y"], row["z"])
-
-        # Create the plane for the panel
-        panel_plane = Plane(o=panel_origin, n=y_axis, x=x_axis)
-
-        # Create the panel geometry
-        panel = Polyface3D.from_box(
-            width=panel_width,
-            depth=panel_thickness,
-            height=panel_length,
-            base_plane=panel_plane,
-        )
-
-        panel_object.append(panel)
-        base_planes.append(panel_plane)
-
-    panels = pd.DataFrame(columns=["panel", "base_plane"])
-    panels["panel"] = panel_object
-    panels["base_plane"] = base_planes
-
-    return panels
+    return coordinates, no_of_panels
 
 
 def get_solar_data(c):
@@ -152,23 +118,11 @@ def get_solar_data(c):
     return solar_positions
 
 
-def calculate_sun_vector(solar_zenith, solar_azimuth):
-    """
-    Calculate the sun vector from solar zenith and azimuth angles.
-    Args:
-        solar_zenith (float): Solar zenith angle in degrees.
-        solar_azimuth (float): Solar azimuth angle in degrees.
-
-    Returns:
-        Vector3D: Sun vector as a 3D vector.
-    """
-    # Convert angles from degrees to radians
-    zenith_rad = math.radians(solar_zenith)
-    azimuth_rad = math.radians(solar_azimuth)
-
-    # Calculate the sun vector components
-    x = math.sin(zenith_rad) * math.cos(azimuth_rad)
-    z = math.sin(zenith_rad) * math.sin(azimuth_rad)
-    y = math.cos(zenith_rad)
-
-    return Vector3D(x, y, z)
+def calculate_shading(c, coordinates, solar_positions):
+    # calculate shading row by row
+    logger.info("Calculating shading for each row of panels")
+    row_coordinates = np.unique(coordinates["y"])
+    for row in row_coordinates:
+        # get number of panels in row for width of row
+        panels_in_row = coordinates[coordinates["y"] == row].shape[0]
+        row_width = panels_in_row * c["panel"]["dimensions"]["width"]
diff --git a/config.yml b/config.yml
index 2920928..7cec3b4 100644
--- a/config.yml
+++ b/config.yml
@@ -1,7 +1,10 @@
 array:
-  system_size: 500 # in kWp
-  spacing: 1 # spacing between adjacent panel rows in m
+  system_size: 100 # in kWp
+  spacing: 1.5 # spacing between adjacent panel rows in m
   edge_setback: 1.8 # distance from the edge of the roof to the array
+  front_face_azimuth: 90 # 90=east, 180=south, 270=west
+  tilt: 90
+  slope: 0 # degrees from horizontal (+ve means shaded row is higher than the row in front)
 
 simulation_date_time:
   start: 2025-03-30 00:00 # start date and time in ISO 8601 format
diff --git a/main.py b/main.py
index 18beee3..eb695d1 100644
--- a/main.py
+++ b/main.py
@@ -1,7 +1,7 @@
 # %%
 import yaml
 import logging
-from Utilities.Shading import calculate_shading_fraction
+from Utilities.Shading import define_grid_layout
 
 logging.basicConfig(
     level=logging.INFO,
@@ -24,6 +24,7 @@ with open(config_path, "r") as file:
 logger.info("Configuration loaded successfully.")
 logger.debug(f"Configuration: {c}")
 
-calculate_shading_fraction(c)
+shading = define_grid_layout(c)
+logger.info("Shading calculation completed successfully.")
 
 # %%