diff --git a/sonoff/xnrg_03_pzem004t.ino b/sonoff/xnrg_03_pzem004t.ino
index d30b769c2..850131762 100644
--- a/sonoff/xnrg_03_pzem004t.ino
+++ b/sonoff/xnrg_03_pzem004t.ino
@@ -181,8 +181,10 @@ void PzemEvery200ms(void)
           break;
         case 4:  // Total energy as 99999Wh
           if (!energy_start || (value < energy_start)) energy_start = value;  // Init after restart and hanlde roll-over if any
-          energy_kWhtoday += (value - energy_start) * 100;
-          energy_start = value;
+          if (value != energy_start) {
+            energy_kWhtoday += (unsigned long)((value - energy_start) * 100);
+            energy_start = value;
+          }
           EnergyUpdateToday();
           break;
       }
diff --git a/sonoff/xnrg_05_pzem_ac.ino b/sonoff/xnrg_05_pzem_ac.ino
index 6bbabdaa9..7c145384a 100644
--- a/sonoff/xnrg_05_pzem_ac.ino
+++ b/sonoff/xnrg_05_pzem_ac.ino
@@ -62,9 +62,11 @@ void PzemAcEverySecond(void)
       energy_power_factor = (float)((buffer[19] << 8) + buffer[20]) / 100.0;                                          // 1.00
       float energy = (float)((buffer[15] << 24) + (buffer[16] << 16) + (buffer[13] << 8) + buffer[14]);               // 4294967295 Wh
 
-      if (!energy_start || (energy < energy_start)) { energy_start = energy; }  // Init after restart and hanlde roll-over if any
-      energy_kWhtoday += (energy - energy_start) * 100;
-      energy_start = energy;
+      if (!energy_start || (energy < energy_start)) { energy_start = energy; }  // Init after restart and handle roll-over if any
+      if (energy != energy_start) {
+        energy_kWhtoday += (unsigned long)((energy - energy_start) * 100);
+        energy_start = energy;
+      }
       EnergyUpdateToday();
     }
   }
diff --git a/sonoff/xnrg_06_pzem_dc.ino b/sonoff/xnrg_06_pzem_dc.ino
index 3dcaf8332..c12f401d4 100644
--- a/sonoff/xnrg_06_pzem_dc.ino
+++ b/sonoff/xnrg_06_pzem_dc.ino
@@ -60,9 +60,11 @@ void PzemDcEverySecond(void)
       energy_active_power = (float)((buffer[9] << 24) + (buffer[10] << 16) + (buffer[7] << 8) + buffer[8]) / 10.0;  // 429496729.0 W
       float energy = (float)((buffer[13] << 24) + (buffer[14] << 16) + (buffer[11] << 8) + buffer[12]);             // 4294967295 Wh
 
-      if (!energy_start || (energy < energy_start)) { energy_start = energy; }  // Init after restart and hanlde roll-over if any
-      energy_kWhtoday += (energy - energy_start) * 100;
-      energy_start = energy;
+      if (!energy_start || (energy < energy_start)) { energy_start = energy; }  // Init after restart and handle roll-over if any
+      if (energy != energy_start) {
+        energy_kWhtoday += (unsigned long)((energy - energy_start) * 100);
+        energy_start = energy;
+      }
       EnergyUpdateToday();
     }
   }