diff --git a/shared/lib_irradproc.cpp b/shared/lib_irradproc.cpp
index 35db1295a..353f4945a 100644
--- a/shared/lib_irradproc.cpp
+++ b/shared/lib_irradproc.cpp
@@ -1224,6 +1224,8 @@ void incidence(int mode, double tilt, double sazm, double rlim, double zen,
                 rot = backtracking_rotation;
             }
 
+            /*Check if custom tilt angles enabled, apply timeseries value*/
+
             /* Find tilt angle for the tracking surface */
             arg = cos(xtilt) * cos(rot);
             if (arg < -1.0)
@@ -1766,7 +1768,7 @@ irrad::irrad(weather_record wf, weather_header hdr,
              double groundCoverageRatioIn, double slopeTiltIn, double slopeAzmIn, std::vector<double> monthlyTiltDegrees,
              std::vector<double> userSpecifiedAlbedo,
              poaDecompReq *poaAllIn,
-             bool useSpatialAlbedos, const util::matrix_t<double>* userSpecifiedSpatialAlbedos, bool enableSubhourlyClipping) :
+             bool useSpatialAlbedos, const util::matrix_t<double>* userSpecifiedSpatialAlbedos, bool enableSubhourlyClipping, bool useCustomTiltAngles) :
         skyModel(skyModelIn), radiationMode(radiationModeIn), trackingMode(trackModeIn),
         enableBacktrack(backtrackingEnabled), forceToStow(forceToStowIn),
         delt(dtHour), tiltDegrees(tiltDegreesIn), surfaceAzimuthDegrees(azimuthDegreesIn),
diff --git a/shared/lib_irradproc.h b/shared/lib_irradproc.h
index 864aff360..61ec9a122 100644
--- a/shared/lib_irradproc.h
+++ b/shared/lib_irradproc.h
@@ -1055,7 +1055,7 @@ class irrad
         double dtHour, double tiltDegrees, double azimuthDegrees, double trackerRotationLimitDegrees, double stowAngleDegreesIn,
         double groundCoverageRatio, double slopeTilt, double slopeAzm, std::vector<double> monthlyTiltDegrees, std::vector<double> userSpecifiedAlbedo,
         poaDecompReq* poaAllIn,
-        bool useSpatialAlbedos = false, const util::matrix_t<double>* userSpecifiedSpatialAlbedos = nullptr, bool enableSubhourlyClipping = false);
+        bool useSpatialAlbedos = false, const util::matrix_t<double>* userSpecifiedSpatialAlbedos = nullptr, bool enableSubhourlyClipping = false, bool useCustomTiltAngles = false);
 
     /// Construct the irrad class with an Irradiance_IO() object and Subarray_IO() object
     irrad();
diff --git a/shared/lib_pv_io_manager.cpp b/shared/lib_pv_io_manager.cpp
index dcc4146de..11d7d90b6 100644
--- a/shared/lib_pv_io_manager.cpp
+++ b/shared/lib_pv_io_manager.cpp
@@ -376,6 +376,8 @@ Subarray_IO::Subarray_IO(compute_module* cm, const std::string& cmName, size_t s
                 if (monthlyTiltDegrees[i] < 0.0) throw exec_error(cmName, "Subarray " + util::to_string((int)subarrayNumber) + " monthly tilt angles cannot be negative.");
             }
         }
+        /* Insert checks for custom tilt angles here*/
+
         //azimuth required for fixed tilt, single axis, and seasonal tilt- can't check for this in variable table so check here
         azimuthDegrees = std::numeric_limits<double>::quiet_NaN();
         if (trackMode == irrad::FIXED_TILT || trackMode == irrad::SINGLE_AXIS || trackMode == irrad::SEASONAL_TILT)
diff --git a/shared/lib_pv_io_manager.h b/shared/lib_pv_io_manager.h
index c745f48ad..a1a5347ee 100644
--- a/shared/lib_pv_io_manager.h
+++ b/shared/lib_pv_io_manager.h
@@ -465,6 +465,8 @@ struct Subarray_IO
     double slopeTilt;                   // Angle of sloped terrain [degrees]
     double slopeAzm;                    // azimuth of sloped terrain relative to tracker azimuth [degrees]
 	double tiltDegrees;					// The surface tilt [degrees]
+    flag useCustomTiltAngles;           // Use custom timeseries rotation angles
+    std::vector<double> customTiltAngles; //Custom timeseries rotation angles [degrees]
 	double azimuthDegrees;				// The surface azimuth [degrees]
 	int trackMode;						// The tracking mode [0 = fixed, 1 = single-axis tracking, 2 = two-axis tracking, 3 = azimuth-axis tracking, 4 = seasonal-tilt
 	double trackerRotationLimitDegrees; // The rotational limit of the tracker [degrees]
diff --git a/ssc/cmod_pvsamv1.cpp b/ssc/cmod_pvsamv1.cpp
index a81825409..a3ad405ef 100644
--- a/ssc/cmod_pvsamv1.cpp
+++ b/ssc/cmod_pvsamv1.cpp
@@ -1139,8 +1139,8 @@ void cm_pvsamv1::exec()
     for (size_t nn = 0; nn < num_subarrays; nn++)
     {
         if (as_integer("use_user_tilt_angles") == 1 && is_assigned("user_tilt_angles_array")) {
-            Subarrays[nn]->trackMode = irrad::FIXED_TILT;
-            Subarrays[nn]->tiltDegrees = 0; //reset to 0 to then be replaced in loop?
+            Subarrays[nn]->trackMode = irrad::SINGLE_AXIS;
+            //Subarrays[nn]->tiltDegrees = 0; //reset to 0 to then be replaced in loop?
             Subarrays[nn]->backtrackingEnabled = false; //account for backtracking in user-specified angles [deg]
         }
         if (Subarrays[nn]->tiltEqualLatitude)
@@ -1506,10 +1506,11 @@ void cm_pvsamv1::exec()
                     || Subarrays[nn]->nStrings < 1)
                     continue; // skip disabled subarrays
 
+                /*
                 if (as_integer("use_user_tilt_angles") == 1 && is_assigned("user_tilt_angles_array")) {
                     Subarrays[nn]->tiltDegrees = user_tilt_angles[inrec];
                     
-                }
+                }*/
 
                 irrad irr(Irradiance->weatherRecord, Irradiance->weatherHeader,
                     Irradiance->skyModel, Irradiance->radiationMode, Subarrays[nn]->trackMode,