diff --git a/examples/check_peak.py b/examples/check_peak.py
index 68740ba..58293ac 100755
--- a/examples/check_peak.py
+++ b/examples/check_peak.py
@@ -33,7 +33,7 @@ print("      SoC: %.2f" % soc_percent)
 print("Total  WH: %.2f" % total_wh)
 
 wh_remain = (soc_percent / 100.0) * total_wh
-h_estim = wh_remain - (avg_charge - avg_discharge)
+h_estim = wh_remain - (avg_discharge - avg_charge)
 h_estpct = (h_estim / total_wh) * 100
 
 print("WH remain: %.2f" % wh_remain)