diff --git a/db/routines/R__043_fn_pv_forecast_correction_factor.sql b/db/routines/R__043_fn_pv_forecast_correction_factor.sql
index e9250b4..d8a848a 100644
--- a/db/routines/R__043_fn_pv_forecast_correction_factor.sql
+++ b/db/routines/R__043_fn_pv_forecast_correction_factor.sql
@@ -18,7 +18,8 @@ declare
   v_factor numeric := 1.0;
   v_clamped boolean := false;
 begin
-  select coalesce(sum(ti.pv_power_w) * 0.25 / 1000.0, 0)
+  -- Telemetrie je 1min (avg power). Energie v kWh ≈ sum(W) * (1/60 h) / 1000.
+  select coalesce(sum(ti.pv_power_w) / 60.0 / 1000.0, 0)
   into v_actual
   from ems.telemetry_inverter ti
   where ti.site_id = p_site_id