diff --git a/netbox/dcim/api/serializers.py b/netbox/dcim/api/serializers.py
index 7883ca169..1f7603241 100644
--- a/netbox/dcim/api/serializers.py
+++ b/netbox/dcim/api/serializers.py
@@ -699,8 +699,8 @@ class PowerFeedSerializer(TaggitSerializer, CustomFieldModelSerializer):
         default=POWERFEED_STATUS_ACTIVE
     )
     supply = ChoiceField(
-        choices=POWERFEED_SUPPLY_CHOICES,
-        default=POWERFEED_SUPPLY_AC
+        choices=PowerFeedSupplyChoices,
+        default=PowerFeedSupplyChoices.SUPPLY_AC
     )
     phase = ChoiceField(
         choices=POWERFEED_PHASE_CHOICES,
diff --git a/netbox/dcim/choices.py b/netbox/dcim/choices.py
index 7b7b18b4d..5d44f1cf4 100644
--- a/netbox/dcim/choices.py
+++ b/netbox/dcim/choices.py
@@ -892,3 +892,19 @@ class PowerFeedTypeChoices(ChoiceSet):
         TYPE_PRIMARY: 1,
         TYPE_REDUNDANT: 2,
     }
+
+
+class PowerFeedSupplyChoices(ChoiceSet):
+
+    SUPPLY_AC = 'ac'
+    SUPPLY_DC = 'dc'
+
+    CHOICES = (
+        (SUPPLY_AC, 'Primary'),
+        (SUPPLY_DC, 'Redundant'),
+    )
+
+    LEGACY_MAP = {
+        SUPPLY_AC: 1,
+        SUPPLY_DC: 2,
+    }
diff --git a/netbox/dcim/constants.py b/netbox/dcim/constants.py
index 8a574b185..13335de3f 100644
--- a/netbox/dcim/constants.py
+++ b/netbox/dcim/constants.py
@@ -68,12 +68,6 @@ COMPATIBLE_TERMINATION_TYPES = {
 }
 
 # Power feeds
-POWERFEED_SUPPLY_AC = 1
-POWERFEED_SUPPLY_DC = 2
-POWERFEED_SUPPLY_CHOICES = (
-    (POWERFEED_SUPPLY_AC, 'AC'),
-    (POWERFEED_SUPPLY_DC, 'DC'),
-)
 POWERFEED_PHASE_SINGLE = 1
 POWERFEED_PHASE_3PHASE = 3
 POWERFEED_PHASE_CHOICES = (
diff --git a/netbox/dcim/forms.py b/netbox/dcim/forms.py
index 32d60ace7..f767d0903 100644
--- a/netbox/dcim/forms.py
+++ b/netbox/dcim/forms.py
@@ -3865,7 +3865,7 @@ class PowerFeedCSVForm(forms.ModelForm):
         help_text='Primary or redundant'
     )
     supply = CSVChoiceField(
-        choices=POWERFEED_SUPPLY_CHOICES,
+        choices=PowerFeedSupplyChoices,
         required=False,
         help_text='AC/DC'
     )
@@ -3942,7 +3942,7 @@ class PowerFeedBulkEditForm(BootstrapMixin, AddRemoveTagsForm, CustomFieldBulkEd
         widget=StaticSelect2()
     )
     supply = forms.ChoiceField(
-        choices=add_blank_choice(POWERFEED_SUPPLY_CHOICES),
+        choices=add_blank_choice(PowerFeedSupplyChoices),
         required=False,
         initial='',
         widget=StaticSelect2()
@@ -4019,7 +4019,7 @@ class PowerFeedFilterForm(BootstrapMixin, CustomFieldFilterForm):
         widget=StaticSelect2()
     )
     supply = forms.ChoiceField(
-        choices=add_blank_choice(POWERFEED_SUPPLY_CHOICES),
+        choices=add_blank_choice(PowerFeedSupplyChoices),
         required=False,
         widget=StaticSelect2()
     )
diff --git a/netbox/dcim/migrations/0084_3569_powerfeed_fields.py b/netbox/dcim/migrations/0084_3569_powerfeed_fields.py
index d40d367e6..5004258bd 100644
--- a/netbox/dcim/migrations/0084_3569_powerfeed_fields.py
+++ b/netbox/dcim/migrations/0084_3569_powerfeed_fields.py
@@ -6,6 +6,11 @@ POWERFEED_TYPE_CHOICES = (
     (2, 'redundant'),
 )
 
+POWERFEED_SUPPLY_CHOICES = (
+    (1, 'ac'),
+    (2, 'dc'),
+)
+
 
 def powerfeed_type_to_slug(apps, schema_editor):
     PowerFeed = apps.get_model('dcim', 'PowerFeed')
@@ -13,6 +18,12 @@ def powerfeed_type_to_slug(apps, schema_editor):
         PowerFeed.objects.filter(type=id).update(type=slug)
 
 
+def powerfeed_supply_to_slug(apps, schema_editor):
+    PowerFeed = apps.get_model('dcim', 'PowerFeed')
+    for id, slug in POWERFEED_SUPPLY_CHOICES:
+        PowerFeed.objects.filter(supply=id).update(supply=slug)
+
+
 class Migration(migrations.Migration):
     atomic = False
 
@@ -22,7 +33,7 @@ class Migration(migrations.Migration):
 
     operations = [
 
-        # Cable.type
+        # PowerFeed.type
         migrations.AlterField(
             model_name='powerfeed',
             name='type',
@@ -32,4 +43,14 @@ class Migration(migrations.Migration):
             code=powerfeed_type_to_slug
         ),
 
+        # PowerFeed.supply
+        migrations.AlterField(
+            model_name='powerfeed',
+            name='supply',
+            field=models.CharField(blank=True, max_length=50),
+        ),
+        migrations.RunPython(
+            code=powerfeed_supply_to_slug
+        ),
+
     ]
diff --git a/netbox/dcim/models.py b/netbox/dcim/models.py
index c1b951496..3b9ee069e 100644
--- a/netbox/dcim/models.py
+++ b/netbox/dcim/models.py
@@ -3112,12 +3112,14 @@ class PowerFeed(ChangeLoggedModel, CableTermination, CustomFieldModel):
         default=POWERFEED_STATUS_ACTIVE
     )
     type = models.CharField(
+        max_length=50,
         choices=PowerFeedTypeChoices,
         default=PowerFeedTypeChoices.TYPE_PRIMARY
     )
-    supply = models.PositiveSmallIntegerField(
-        choices=POWERFEED_SUPPLY_CHOICES,
-        default=POWERFEED_SUPPLY_AC
+    supply = models.CharField(
+        max_length=50,
+        choices=PowerFeedSupplyChoices,
+        default=PowerFeedSupplyChoices.SUPPLY_AC
     )
     phase = models.PositiveSmallIntegerField(
         choices=POWERFEED_PHASE_CHOICES,