diff --git a/src/main/java/com/interplug/qcast/biz/master/dto/roofmaterial/ApiRoofMaterialResponse.java b/src/main/java/com/interplug/qcast/biz/master/dto/roofmaterial/ApiRoofMaterialResponse.java
index a2d6ad3c..3c242892 100644
--- a/src/main/java/com/interplug/qcast/biz/master/dto/roofmaterial/ApiRoofMaterialResponse.java
+++ b/src/main/java/com/interplug/qcast/biz/master/dto/roofmaterial/ApiRoofMaterialResponse.java
@@ -41,4 +41,7 @@ public class ApiRoofMaterialResponse {
 
   @Schema(description = "서까래 기본 수치")
   private String raftBaseCd;
+
+  @Schema(description = "경사도 기본 수치")
+  private String inclBase;
 }
diff --git a/src/main/java/com/interplug/qcast/biz/pwrGnrSimulation/PwrGnrSimService.java b/src/main/java/com/interplug/qcast/biz/pwrGnrSimulation/PwrGnrSimService.java
index 275046df..0c4325e3 100644
--- a/src/main/java/com/interplug/qcast/biz/pwrGnrSimulation/PwrGnrSimService.java
+++ b/src/main/java/com/interplug/qcast/biz/pwrGnrSimulation/PwrGnrSimService.java
@@ -867,11 +867,11 @@ public class PwrGnrSimService {
     // houi[rad]을 [도]로 변환
     houi = (houi / (2 * Math.PI)) * 360;
 
-    // 電力ピークカット
+    // 電力ピークカット(houi 절대값으로 변경)
     double watt_peakcut_result =
-        ((matrix_multiply1 * (Math.cos(houi * Math.PI / 180) + 1) + matrix_multiply2) < 0.1)
+        ((matrix_multiply1 * (Math.cos(Math.abs(houi) * Math.PI / 180) + 1) + matrix_multiply2) < 0.1)
             ? 0.1
-            : (matrix_multiply1 * (Math.cos(houi * Math.PI / 180) + 1) + matrix_multiply2);
+            : (matrix_multiply1 * (Math.cos(Math.abs(houi) * Math.PI / 180) + 1) + matrix_multiply2);
 
     ////////////
     // pcs1과 모듈 1의 전류차 구하기 용도
@@ -1869,20 +1869,20 @@ public class PwrGnrSimService {
           //							+ Math.cos(taiyousekii[i]) * Math.sin(koubai) * Math.sin(houi) *
           // Math.sin(jikakudo[i][j])));
           //					System.err.println(  "  " );
-
+            //houi 절대값으로 변경
           cosTheta[m][j] =
               Math.max(
                   0,
                   (Math.sin(latlng[i][0]) * Math.cos(koubai)
-                              - Math.cos(latlng[i][0]) * Math.sin(koubai) * Math.cos(houi))
+                              - Math.cos(latlng[i][0]) * Math.sin(koubai) * Math.cos(Math.abs(houi)))
                           * Math.sin(taiyousekii[i])
                       + (Math.cos(latlng[i][0]) * Math.cos(koubai)
-                              + Math.sin(latlng[i][0]) * Math.sin(koubai) * Math.cos(houi))
+                              + Math.sin(latlng[i][0]) * Math.sin(koubai) * Math.cos(Math.abs(houi)))
                           * Math.cos(taiyousekii[i])
                           * Math.cos(jikakudo[i][j])
                       + Math.cos(taiyousekii[i])
                           * Math.sin(koubai)
-                          * Math.sin(houi)
+                          * Math.sin(Math.abs(houi))
                           * Math.sin(jikakudo[i][j]));
 
           rb[m][j] = (cosThetaZ[i][j] == 0) ? 0 : cosTheta[m][j] / cosThetaZ[i][j];