diff --git a/src/main/java/com/interplug/qcast/biz/estimate/EstimateMapper.java b/src/main/java/com/interplug/qcast/biz/estimate/EstimateMapper.java
index caa65943..48bf6fed 100644
--- a/src/main/java/com/interplug/qcast/biz/estimate/EstimateMapper.java
+++ b/src/main/java/com/interplug/qcast/biz/estimate/EstimateMapper.java
@@ -21,6 +21,9 @@ public interface EstimateMapper {
   // 아이템 마스터 목록 조회
   public List<ItemResponse> selectItemMasterList(EstimateRequest estimateRequest);
 
+  // 견적서 지붕재 인증용량 조회
+  public String selectEstimateRoofCertVolKw(EstimateRequest estimateRequest);
+
   // 견적서 지붕재 목록 조회
   public List<RoofResponse> selectEstimateRoofList(EstimateRequest estimateRequest);
 
diff --git a/src/main/java/com/interplug/qcast/biz/estimate/EstimateService.java b/src/main/java/com/interplug/qcast/biz/estimate/EstimateService.java
index 8e813283..23c54b5f 100644
--- a/src/main/java/com/interplug/qcast/biz/estimate/EstimateService.java
+++ b/src/main/java/com/interplug/qcast/biz/estimate/EstimateService.java
@@ -10,9 +10,6 @@ import com.interplug.qcast.biz.object.dto.ObjectResponse;
 import com.interplug.qcast.biz.object.dto.PlanRequest;
 import com.interplug.qcast.biz.object.dto.PlanResponse;
 import com.interplug.qcast.biz.pwrGnrSimulation.PwrGnrSimService;
-import com.interplug.qcast.biz.pwrGnrSimulation.dto.PwrGnrSimGuideResponse;
-import com.interplug.qcast.biz.pwrGnrSimulation.dto.PwrGnrSimRequest;
-import com.interplug.qcast.biz.pwrGnrSimulation.dto.PwrGnrSimResponse;
 import com.interplug.qcast.config.Exception.ErrorCode;
 import com.interplug.qcast.config.Exception.QcastException;
 import com.interplug.qcast.config.message.Messages;
@@ -28,6 +25,7 @@ import java.io.File;
 import java.lang.reflect.Field;
 import java.lang.reflect.Method;
 import java.math.BigDecimal;
+import java.text.SimpleDateFormat;
 import java.util.*;
 import java.util.List;
 import lombok.RequiredArgsConstructor;
@@ -685,31 +683,33 @@ public class EstimateService {
       }
 
       // 지붕재 목록 조회
-      estimateRequest.setSchItemGroup("MODULE_");
-
       RoofInfoResponse roofInfoResponse = new RoofInfoResponse();
       List<RoofResponse> roofList = estimateMapper.selectEstimateRoofList(estimateRequest);
       List<RoofResponse> roofPcList = estimateMapper.selectEstimateRoofPcList(estimateRequest);
+      estimateRequest.setSchItemGroup("MODULE_");
       List<RoofResponse> roofVolList = estimateMapper.selectEstimateRoofVolList(estimateRequest);
 
       BigDecimal moduleTotAmount = BigDecimal.ZERO;
-      BigDecimal moduleTotVol = BigDecimal.ZERO;
+      BigDecimal moduleTotVolKw = BigDecimal.ZERO;
       for (RoofResponse roofVol : roofVolList) {
         BigDecimal amount =
             new BigDecimal(StringUtils.isEmpty(roofVol.getAmount()) ? "0" : roofVol.getAmount());
         BigDecimal vol =
-            new BigDecimal(StringUtils.isEmpty(roofVol.getVol()) ? "0" : roofVol.getVol());
+            new BigDecimal(StringUtils.isEmpty(roofVol.getVolKw()) ? "0" : roofVol.getVolKw());
 
         moduleTotAmount = moduleTotAmount.add(amount);
-        moduleTotVol = moduleTotVol.add(vol);
+        moduleTotVolKw = moduleTotVolKw.add(vol);
       }
       roofInfoResponse.setModuleTotAmount(String.valueOf(moduleTotAmount));
-      roofInfoResponse.setModuleTotVol(String.valueOf(moduleTotVol));
+      roofInfoResponse.setModuleTotVolKw(String.valueOf(moduleTotVolKw));
 
       roofInfoResponse.setRoofList(roofList);
       roofInfoResponse.setRoofPcList(roofPcList);
       roofInfoResponse.setRoofVolList(roofVolList);
 
+      // 인증용량 구하기 (지붕면마다 모듈과 PCS의 총 용량을 서로 비교해 낮은쪽 용량으로 합산)
+      roofInfoResponse.setCertVolKw(estimateMapper.selectEstimateRoofCertVolKw(estimateRequest));
+
       estimateResponse.setRoofInfo(roofInfoResponse);
 
       // 아이템 목록 조회
@@ -757,11 +757,13 @@ public class EstimateService {
       estimateResponse.setTotPrice(
           String.format("%1$,.0f", Double.parseDouble(estimateResponse.getTotPrice())));
 
-      String excelFileName = "Quation_Detail";
+      String excelFileName =
+          "Quation_Detail_" + new SimpleDateFormat("yyyyMMdd").format(new Date());
       String excelTemplatePath =
           excelTemplateFilePath + File.separator + "excel_download_quotation_detail_template.xlsx";
 
       //  발전시뮬레이션 계산
+      /*
       PwrGnrSimRequest pwrGnrSimRequest = new PwrGnrSimRequest();
       pwrGnrSimRequest.setObjectNo(estimateResponse.getObjectNo());
       pwrGnrSimRequest.setPlanNo(estimateResponse.getPlanNo());
@@ -784,6 +786,8 @@ public class EstimateService {
 
       estimateResponse.setPwrGnrSim(pwrGnrSimResponse);
 
+       */
+
       excelUtil.download(
           request,
           response,
diff --git a/src/main/java/com/interplug/qcast/biz/estimate/dto/RoofInfoResponse.java b/src/main/java/com/interplug/qcast/biz/estimate/dto/RoofInfoResponse.java
index c367eb4a..4c035da5 100644
--- a/src/main/java/com/interplug/qcast/biz/estimate/dto/RoofInfoResponse.java
+++ b/src/main/java/com/interplug/qcast/biz/estimate/dto/RoofInfoResponse.java
@@ -9,11 +9,14 @@ import lombok.Setter;
 @Getter
 @Setter
 public class RoofInfoResponse {
+  @Schema(description = "인증용량")
+  private String certVolKw;
+
   @Schema(description = "모듈 총 수")
   private String moduleTotAmount;
 
   @Schema(description = "모듈 총 용량")
-  private String moduleTotVol;
+  private String moduleTotVolKw;
 
   @Schema(description = "지붕면 목록")
   private List<RoofResponse> roofList;
diff --git a/src/main/java/com/interplug/qcast/biz/estimate/dto/RoofResponse.java b/src/main/java/com/interplug/qcast/biz/estimate/dto/RoofResponse.java
index 81c95d57..361fc215 100644
--- a/src/main/java/com/interplug/qcast/biz/estimate/dto/RoofResponse.java
+++ b/src/main/java/com/interplug/qcast/biz/estimate/dto/RoofResponse.java
@@ -75,7 +75,7 @@ public class RoofResponse {
   private String amount;
 
   @Schema(description = "용량")
-  private String vol;
+  private String volKw;
 
   @Schema(description = "Pc 모듈 매수")
   private String pcModuleAmount;
diff --git a/src/main/resources/mappers/estimate/estimateMapper.xml b/src/main/resources/mappers/estimate/estimateMapper.xml
index a9c30992..9e51be6c 100644
--- a/src/main/resources/mappers/estimate/estimateMapper.xml
+++ b/src/main/resources/mappers/estimate/estimateMapper.xml
@@ -215,6 +215,48 @@
             </foreach>
     </select>
 
+    <select id="selectEstimateRoofCertVolKw" parameterType="com.interplug.qcast.biz.estimate.dto.EstimateRequest" resultType="String">
+        /* sqlid : com.interplug.qcast.biz.estimate.selectEstimateRoofCertVolKw */
+        SELECT
+              FORMAT(ISNULL(SUM(CASE WHEN T.MODULE_VOL_KW <![CDATA[ <= ]]> T.PC_VOL_KW THEN T.MODULE_VOL_KW ELSE T.PC_VOL_KW END), 0), '#,##0.000') AS CERT_VOL_KW
+        FROM
+        (
+            SELECT
+                  P.OBJECT_NO
+                , P.PLAN_NO
+                , RE.ROOF_NO
+                , RE.ROOF_SURFACE
+                , ROUND(CAST(RE.SLOPE AS FLOAT), 2) AS SLOPE
+                , RIE.AMOUNT
+                , CAST(RIE.SPECIFICATION AS FLOAT) SPECIFICATION
+                , ROUND((RIE.AMOUNT * CAST(ISNULL(RIE.SPECIFICATION, 0) AS FLOAT) / 1000), 4) AS PC_VOL_KW
+                , I.ITEM_ID
+                , I.ITEM_NO
+                , ISNULL((
+                    SELECT
+                        SUM((AMOUNT * CAST(ISNULL(SPECIFICATION, 0) AS FLOAT) / 1000))
+                    FROM T_ROOF_ITEM_ESTIMATE
+                    WHERE ROOF_NO = RIE.ROOF_NO
+                        AND OBJECT_NO = RIE.OBJECT_NO
+                        AND PLAN_NO = RIE.PLAN_NO
+                        AND PC_ITEM_ID = RIE.ITEM_ID
+                  ), 0) AS MODULE_VOL_KW
+            FROM T_PLAN P WITH (NOLOCK)
+            INNER JOIN T_ROOF_ESTIMATE RE WITH (NOLOCK)
+                ON P.OBJECT_NO = RE.OBJECT_NO
+                AND P.PLAN_NO = RE.PLAN_NO
+            INNER JOIN T_ROOF_ITEM_ESTIMATE RIE WITH (NOLOCK)
+                ON RE.ROOF_NO = RIE.ROOF_NO
+                AND RE.OBJECT_NO = RE.OBJECT_NO
+                AND RE.PLAN_NO = RE.PLAN_NO
+            INNER JOIN M_ITEM I WITH (NOLOCK)
+                ON RIE.ITEM_ID = I.ITEM_ID
+            WHERE P.OBJECT_NO = #{objectNo}
+                AND P.PLAN_NO = #{planNo}
+                AND I.ITEM_GROUP = 'PC_'
+        ) T
+    </select>
+
     <select id="selectEstimateRoofList" parameterType="com.interplug.qcast.biz.estimate.dto.EstimateRequest" resultType="com.interplug.qcast.biz.estimate.dto.RoofResponse">
         /* sqlid : com.interplug.qcast.biz.estimate.selectEstimateRoofList */
         SELECT
@@ -290,17 +332,19 @@
     <select id="selectEstimateRoofVolList" parameterType="com.interplug.qcast.biz.estimate.dto.EstimateRequest" resultType="com.interplug.qcast.biz.estimate.dto.RoofResponse">
         /* sqlid : com.interplug.qcast.biz.estimate.selectEstimateRoofVolList */
         SELECT
-              T.OBJECT_NO
+               T.OBJECT_NO
              , T.PLAN_NO
+             , T.ROOF_NO
              , T.ROOF_SURFACE
              , T.SLOPE
              , SUM(T.AMOUNT) AS AMOUNT
-             , ROUND(SUM(T.AMOUNT * T.SPECIFICATION / 1000), 4) AS VOL
+             , ROUND(SUM(T.AMOUNT * T.SPECIFICATION / 1000), 4) AS VOL_KW
         FROM
         (
             SELECT
                   P.OBJECT_NO
                 , P.PLAN_NO
+                , RE.ROOF_NO
                 , RE.ROOF_SURFACE
                 , ROUND(CAST(RE.SLOPE AS FLOAT), 2) AS SLOPE
                 , RIE.AMOUNT
@@ -323,7 +367,7 @@
                 AND I.ITEM_GROUP = #{schItemGroup}
                 </if>
         ) T
-        GROUP BY T.OBJECT_NO, T.PLAN_NO, T.ROOF_SURFACE, T.SLOPE
+        GROUP BY T.OBJECT_NO, T.PLAN_NO, T.ROOF_NO, T.ROOF_SURFACE, T.SLOPE
     </select>
 
     <select id="selectEstimateNoteList" parameterType="com.interplug.qcast.biz.estimate.dto.NoteRequest" resultType="com.interplug.qcast.biz.estimate.dto.NoteResponse">