diff --git a/apps/predbat/predbat.py b/apps/predbat/predbat.py
index 4bc392868..b06dca5a3 100644
--- a/apps/predbat/predbat.py
+++ b/apps/predbat/predbat.py
@@ -18,7 +18,7 @@
 import os
 import yaml
 
-THIS_VERSION = "v7.15.2"
+THIS_VERSION = "v7.15.3"
 TIME_FORMAT = "%Y-%m-%dT%H:%M:%S%z"
 TIME_FORMAT_SECONDS = "%Y-%m-%dT%H:%M:%S.%f%z"
 TIME_FORMAT_OCTOPUS = "%Y-%m-%d %H:%M:%S%z"
@@ -8533,7 +8533,7 @@ def find_charge_rate(self, minutes_now, soc, window, target_soc, max_rate):
         """
         Find the lowest charge rate that fits the charge slow
         """
-        margin = 20
+        margin = 10
         if self.set_charge_low_power:
             minutes_left = window["end"] - minutes_now - margin