diff --git a/src/calibration.h b/src/calibration.h
index e0523cb..c8fbc75 100644
--- a/src/calibration.h
+++ b/src/calibration.h
@@ -6,10 +6,24 @@
  * than the actual voltage, you have to scale by 1.02 and therefore specify
  * 1020 in this list. */
 
+/* Values for the device at the B26 tower */
+
+#if 0
 #define CAL_FACTOR_U_BAT     994
 #define CAL_FACTOR_U_SOLAR   997
 #define CAL_FACTOR_U_SW      996
 #define CAL_FACTOR_I_SOLAR  1015
 #define CAL_FACTOR_I_LOAD   1000
+#endif
+
+/* Values for the development device */
+
+#if 1
+#define CAL_FACTOR_U_BAT    1012
+#define CAL_FACTOR_U_SOLAR  1015
+#define CAL_FACTOR_U_SW     1006
+#define CAL_FACTOR_I_SOLAR  3980
+#define CAL_FACTOR_I_LOAD   1000
+#endif
 
 #endif // CALIBRATION_H