diff --git a/Cargo.lock b/Cargo.lock
index 7eb0b83..0f0e9a3 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2573,7 +2573,7 @@ dependencies = [
 
 [[package]]
 name = "tesla-charge-controller"
-version = "1.0.17"
+version = "1.0.18"
 dependencies = [
  "async-channel",
  "chrono",
diff --git a/Cargo.toml b/Cargo.toml
index af0d477..fa84e5e 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "tesla-charge-controller"
-version = "1.0.17"
+version = "1.0.18"
 edition = "2021"
 license = "MITNFA"
 description = "Controls Tesla charge rate based on solar charge data"
diff --git a/src/tesla_charge_rate.rs b/src/tesla_charge_rate.rs
index c86be13..796226a 100644
--- a/src/tesla_charge_rate.rs
+++ b/src/tesla_charge_rate.rs
@@ -107,7 +107,7 @@ impl PidLoop {
         charge_state: &ChargeState,
         delta_time: f64,
     ) -> Option<i64> {
-        let error = pl_state.target_voltage - pl_state.battery_voltage;
+        let error = pl_state.battery_voltage - pl_state.target_voltage;
         let derivative = (error - self.previous_error) / delta_time;
         let config = access_config();
         let extra_offsets = if pl_state.internal_load_current > 1. {