Fix power production

src/apps/smart_grid/SmartOpcServer.cpp

@@ -106,7 +106,7 @@ void SmartOpcServer::run_server()
         // update opc objects
         m_sun.SetValue(Variant(m_state_machine.m_model.get_sun()));
         m_wind.SetValue(Variant(m_state_machine.m_model.get_wind()));
-        m_power_production.SetValue(Variant(m_state_machine.m_model.get_power_production()));
+        m_power_production.SetValue(Variant(m_state_machine.m_model.get_power_production().sum()));
         m_usage.SetValue(Variant(m_state_machine.m_model.get_power_usage()));
         m_excess_power.SetValue(Variant(m_state_machine.m_model.get_excess_power()));
         m_time.SetValue(Variant(m_state_machine.m_model.get_time()));