diff --git a/tasmota/tasmota_xnrg_energy/xnrg_14_bl09xx.ino b/tasmota/tasmota_xnrg_energy/xnrg_14_bl09xx.ino
index 3c49d0913..4d9d1b15f 100644
--- a/tasmota/tasmota_xnrg_energy/xnrg_14_bl09xx.ino
+++ b/tasmota/tasmota_xnrg_energy/xnrg_14_bl09xx.ino
@@ -44,26 +44,48 @@
 
 //#define DEBUG_BL09XX
 
+#ifndef BL0939_PREF
 #define BL0939_PREF                 713       // =(4046*1*0,51*1000)/(1,218*1,218*(390*5+0,51)) = 713,105
+#endif
+#ifndef BL0939_UREF
 #define BL0939_UREF                 17159     // =(79931*0,51*1000)/(1,218*(390*5+0,51)) = 17158,92
+#endif
+#ifndef BL0939_IREF
 #define BL0939_IREF                 266013    // =(324004*1)/1,218 = 266013,14
+#endif
 
+#ifndef BL0940_PREF
 #define BL0940_PREF                 1430
+#endif
+#ifndef BL0940_UREF
 #define BL0940_UREF                 33000
+#endif
+#ifndef BL0940_IREF
 #define BL0940_IREF                 275000
+#endif
 
+#ifndef BL0942_PREF
 #define BL0942_PREF                 596
+#endif
+#ifndef BL0942_UREF
 #define BL0942_UREF                 15187
+#endif
+#ifndef BL0942_IREF
 #define BL0942_IREF                 251213
+#endif
 
+#ifndef BL09XX_WRITE_COMMAND
 #define BL09XX_WRITE_COMMAND        0xA0  // 0xA8 according to documentation
+#endif
 #define BL09XX_REG_I_FAST_RMS_CTRL  0x10
 #define BL09XX_REG_MODE             0x18
 #define BL09XX_REG_SOFT_RESET       0x19
 #define BL09XX_REG_USR_WRPROT       0x1A
 #define BL09XX_REG_TPS_CTRL         0x1B
 
+#ifndef BL09XX_READ_COMMAND
 #define BL09XX_READ_COMMAND         0x50  // 0x58 according to documentation
+#endif
 #define BL09XX_FULL_PACKET          0xAA
 
 #define BL09XX_PACKET_HEADER        0x55  // 0x58 according to documentation