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 c36b2b15..54ff3bef 100644
--- a/src/main/java/com/interplug/qcast/biz/pwrGnrSimulation/PwrGnrSimService.java
+++ b/src/main/java/com/interplug/qcast/biz/pwrGnrSimulation/PwrGnrSimService.java
@@ -210,33 +210,38 @@ public class PwrGnrSimService {
       }
       k++;
     }
-    // module 정보
-    k = 0;
-    for (PwrGnrSimRoofResponse m : moduleGroupList) {
-      if (k == 0) {
-        pwrGnrSimReq.setModule1(m.getItemId());
-        pwrGnrSimReq.setModuleAmp1(m.getAmp());
-        pwrGnrSimReq.setModuleSpecification1(m.getSpecification());
-        pwrGnrSimReq.setModuleTempCoeff1(m.getTempCoeff());
-        pwrGnrSimReq.setModuleTempLoss1(m.getTempLoss());
-        pwrGnrSimReq.setNorthModuleYn1(m.getNorthModuleYn());   //모듈 북면지원여부
-      } else if (k == 1) {
-        pwrGnrSimReq.setModule2(m.getItemId());
-        pwrGnrSimReq.setModuleAmp2(m.getAmp());
-        pwrGnrSimReq.setModuleSpecification2(m.getSpecification());
-        pwrGnrSimReq.setModuleTempCoeff2(m.getTempCoeff());
-        pwrGnrSimReq.setModuleTempLoss2(m.getTempLoss());
-        pwrGnrSimReq.setNorthModuleYn2(m.getNorthModuleYn());   //모듈 북면지원여부
-      } else {
-        pwrGnrSimReq.setModule3(m.getItemId());
-        pwrGnrSimReq.setModuleAmp3(m.getAmp());
-        pwrGnrSimReq.setModuleSpecification3(m.getSpecification());
-        pwrGnrSimReq.setModuleTempCoeff3(m.getTempCoeff());
-        pwrGnrSimReq.setModuleTempLoss3(m.getTempLoss());
-        pwrGnrSimReq.setNorthModuleYn3(m.getNorthModuleYn());   //모듈 북면지원여부
+      // module 정보 - 중복 모듈 제거
+      k = 0;
+      Set<String> usedModules = new HashSet<>();
+      for (PwrGnrSimRoofResponse m : moduleGroupList) {
+          if (!usedModules.contains(m.getItemId())) {
+              usedModules.add(m.getItemId());
+              if (k == 0) {
+                  pwrGnrSimReq.setModule1(m.getItemId());
+                  pwrGnrSimReq.setModuleAmp1(m.getAmp());
+                  pwrGnrSimReq.setModuleSpecification1(m.getSpecification());
+                  pwrGnrSimReq.setModuleTempCoeff1(m.getTempCoeff());
+                  pwrGnrSimReq.setModuleTempLoss1(m.getTempLoss());
+                  pwrGnrSimReq.setNorthModuleYn1(m.getNorthModuleYn());   //모듈 북면지원여부
+              } else if (k == 1) {
+                  pwrGnrSimReq.setModule2(m.getItemId());
+                  pwrGnrSimReq.setModuleAmp2(m.getAmp());
+                  pwrGnrSimReq.setModuleSpecification2(m.getSpecification());
+                  pwrGnrSimReq.setModuleTempCoeff2(m.getTempCoeff());
+                  pwrGnrSimReq.setModuleTempLoss2(m.getTempLoss());
+                  pwrGnrSimReq.setNorthModuleYn2(m.getNorthModuleYn());   //모듈 북면지원여부
+              } else if (k == 2) {
+                  pwrGnrSimReq.setModule3(m.getItemId());
+                  pwrGnrSimReq.setModuleAmp3(m.getAmp());
+                  pwrGnrSimReq.setModuleSpecification3(m.getSpecification());
+                  pwrGnrSimReq.setModuleTempCoeff3(m.getTempCoeff());
+                  pwrGnrSimReq.setModuleTempLoss3(m.getTempLoss());
+                  pwrGnrSimReq.setNorthModuleYn3(m.getNorthModuleYn());   //모듈 북면지원여부
+              }
+              k++;
+              if (k >= 3) break; // 최대 3개 모듈만 설정
+          }
       }
-      k++;
-    }
 
     // 전체 시스템 용량
     double dSpecification = 0.0;