diff --git a/CHANGELOG.md b/CHANGELOG.md
index c751014f..46c3e4fd 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,6 +12,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Changed
 - Changes to sent and received em data [#2366](https://github.com/ie3-institute/simonaAPI/issues/366)
+- Changed the PRated in the EvModel to SRated and added cosphi to the model [#259](https://github.com/ie3-institute/simonaAPI/issues/259)
 
 ### Fixed
 - Issues related to em data [#2366](https://github.com/ie3-institute/simonaAPI/issues/366)
diff --git a/src/main/java/edu/ie3/simona/api/data/model/ev/EvModel.java b/src/main/java/edu/ie3/simona/api/data/model/ev/EvModel.java
index 04c1fd05..3f17aa8a 100644
--- a/src/main/java/edu/ie3/simona/api/data/model/ev/EvModel.java
+++ b/src/main/java/edu/ie3/simona/api/data/model/ev/EvModel.java
@@ -23,15 +23,20 @@ public interface EvModel {
   String getId();
 
   /**
-   * @return the maximum AC charging power of this ev (as active power)
+   * @return the maximum AC charging power of this ev
    */
-  ComparableQuantity<Power> getPRatedAC();
+  ComparableQuantity<Power> getSRatedAC();
 
   /**
    * @return the maximum DC charging power of this ev (as active power)
    */
   ComparableQuantity<Power> getPRatedDC();
 
+  /**
+   * @return the power factor of this ev
+   */
+  Double getCosPhiRated();
+
   /**
    * @return the storage capacity of this ev's battery
    */