diff --git a/config.yml b/config.yml
index b1f3545..5860189 100644
--- a/config.yml
+++ b/config.yml
@@ -12,3 +12,7 @@ oids:
   - oid: "1.3.6.1.4.1.935.10.1.1.1"    # upsEIdentity
   - oid: "1.3.6.1.4.1.935.10.1.1.2"    # upsESystemSummary
   - oid: "1.3.6.1.4.1.935.10.1.1.3"    # upsEBatterySystem
+
+toNullIfEmpty: #only for int
+  - tne: "upsESystemInputVoltage"
+  - tne: "upsESystemOutputLoad"
diff --git a/main.go b/main.go
index 2e9ba0c..ae4fe9e 100644
--- a/main.go
+++ b/main.go
@@ -34,6 +34,9 @@ type Config struct {
 	OIDs []struct {
 		OID string `yaml:"oid"`
 	} `yaml:"oids"`
+	Tnies []struct {
+		Tnie string `yaml:"tne"`
+	} `yaml:"toNullIfEmpty"`
 }
 
 func loadConfig(filename string) (*Config, error) {
@@ -179,8 +182,12 @@ func starts(params *gosnmp.GoSNMP, config *Config) {
 
 		}
 
-		if toExport["upsESystemInputVoltage"].(int64) <= 0 {
-			delete(toExport, "upsESystemInputVoltage")
+		for _, v := range config.Tnies {
+			if mapVal, ok := toExport[v.Tnie]; ok {
+				if mapVal.(int64) <= 0 {
+					delete(toExport, v.Tnie)
+				}
+			}
 		}
 
 		go PushData(toExport, tm)