diff --git a/firmware/controllers/algo/engine_configuration.cpp b/firmware/controllers/algo/engine_configuration.cpp
index 69f51b866f..a82b3975bb 100644
--- a/firmware/controllers/algo/engine_configuration.cpp
+++ b/firmware/controllers/algo/engine_configuration.cpp
@@ -391,6 +391,7 @@ void setDefaultConfiguration(DECLARE_ENGINE_PARAMETER_F) {
 	engineConfiguration->HD44780width = 20;
 	engineConfiguration->HD44780height = 4;
 
+	engineConfiguration->alternatorOffset = 0;
 	engineConfiguration->alternatorControlPFactor = 30;
 	boardConfiguration->alternatorDT = 100;
 
diff --git a/firmware/controllers/algo/engine_configuration_generated_structures.h b/firmware/controllers/algo/engine_configuration_generated_structures.h
index 8a573b7389..1d92fc9a87 100644
--- a/firmware/controllers/algo/engine_configuration_generated_structures.h
+++ b/firmware/controllers/algo/engine_configuration_generated_structures.h
@@ -1,4 +1,4 @@
-// this section was generated by config_definition.jar on Wed May 13 20:30:29 EDT 2015
+// this section was generated by config_definition.jar on Thu May 21 19:13:37 EDT 2015
 // begin
 #include "rusefi_types.h"
 typedef struct {
@@ -896,7 +896,7 @@ typedef struct {
 	/**
 	 * offset 604
 	 */
-	float unused596;
+	float alternatorOffset;
 	/**
 	 * @see hasBaroSensor
 	 * offset 608
@@ -1302,4 +1302,4 @@ typedef struct {
 } persistent_config_s;
 
 // end
-// this section was generated by config_definition.jar on Wed May 13 20:30:29 EDT 2015
+// this section was generated by config_definition.jar on Thu May 21 19:13:37 EDT 2015
diff --git a/firmware/controllers/algo/rusefi_generated.h b/firmware/controllers/algo/rusefi_generated.h
index 347d43cb45..ead337464c 100644
--- a/firmware/controllers/algo/rusefi_generated.h
+++ b/firmware/controllers/algo/rusefi_generated.h
@@ -192,7 +192,7 @@
 #define afr_v2_offset_hex 254
 #define afr_value2_offset 600
 #define afr_value2_offset_hex 258
-#define unused596_offset 604
+#define alternatorOffset_offset 604
 #define baroSensor_offset 608
 #define baroSensor_offset_hex 260
 #define baroSensor_valueAt0_offset 608
diff --git a/firmware/controllers/alternatorController.cpp b/firmware/controllers/alternatorController.cpp
index 7a408aab4d..d45d721a8f 100644
--- a/firmware/controllers/alternatorController.cpp
+++ b/firmware/controllers/alternatorController.cpp
@@ -36,7 +36,7 @@ static msg_t AltCtrlThread(int param) {
 	while (true) {
 		chThdSleepMilliseconds(boardConfiguration->alternatorDT);
 
-		currentAltDuty = altPid.getValue(boardConfiguration->targetVBatt, getVBatt(engineConfiguration), 1);
+		currentAltDuty = engineConfiguration->alternatorOffset + altPid.getValue(boardConfiguration->targetVBatt, getVBatt(engineConfiguration), 1);
 		if (boardConfiguration->isVerboseAlternator) {
 			scheduleMsg(logger, "alt duty: %f/vbatt=%f/p=%f/i=%f/d=%f int=%f", currentAltDuty, getVBatt(engineConfiguration),
 					altPid.getP(), altPid.getI(), altPid.getD(), altPid.getIntegration());
@@ -57,8 +57,8 @@ void showAltInfo(void) {
 	scheduleMsg(logger, "alt=%s @%s t=%dms", boolToString(engineConfiguration->isAlternatorControlEnabled),
 			hwPortname(boardConfiguration->alternatorControlPin),
 			boardConfiguration->alternatorDT);
-	scheduleMsg(logger, "p=%f/i=%f/d=%f", engineConfiguration->alternatorControlPFactor,
-			0, 0); // todo: i & d
+	scheduleMsg(logger, "p=%f/i=%f/d=%f offset=%f", engineConfiguration->alternatorControlPFactor,
+			0, 0, engineConfiguration->alternatorOffset); // todo: i & d
 	scheduleMsg(logger, "vbatt=%f/duty=%f/target=%f", getVBatt(engineConfiguration), currentAltDuty,
 			boardConfiguration->targetVBatt);
 }
diff --git a/firmware/controllers/settings.cpp b/firmware/controllers/settings.cpp
index 812355cf92..b7b4a9ec06 100644
--- a/firmware/controllers/settings.cpp
+++ b/firmware/controllers/settings.cpp
@@ -946,6 +946,8 @@ static void setValue(const char *paramStr, const char *valueStr) {
 			boardConfiguration->alternatorDT = valueI;
 		}
 		showAltInfo();
+	} else if (strEqualCaseInsensitive(paramStr, "alt_offset")) {
+		engineConfiguration->alternatorOffset = valueI;
 	} else if (strEqualCaseInsensitive(paramStr, "alt_p")) {
 		setAltPFactor(valueF);
 #endif
diff --git a/firmware/integration/rusefi_config.txt b/firmware/integration/rusefi_config.txt
index 8385ff3fc4..39f2c1cdda 100644
--- a/firmware/integration/rusefi_config.txt
+++ b/firmware/integration/rusefi_config.txt
@@ -278,7 +278,7 @@ end_struct
 	
 afr_sensor_s afr;@see hasAfrSensor
 
-	float unused596;
+	float alternatorOffset;
 	
 air_pressure_sensor_config_s baroSensor;@see hasBaroSensor