diff --git a/tasmota/xnrg_21_sdm230.ino b/tasmota/xnrg_21_sdm230.ino
index b73d90341..9cdbdea81 100644
--- a/tasmota/xnrg_21_sdm230.ino
+++ b/tasmota/xnrg_21_sdm230.ino
@@ -190,6 +190,8 @@ void Sdm230SnsInit(void)
   uint8_t result = Sdm230Modbus->Begin(SDM230_SPEED);
   if (result) {
     if (2 == result) { ClaimSerial(); }
+      Energy.phase_count = 1;
+      Energy.frequency_common = true;             // Use common frequency
   } else {
     TasmotaGlobal.energy_driver = ENERGY_NONE;
   }