Long-term Operation of Home Appliance Power Monitoring System with Gateway Redundancy

The power monitoring system is used to manage the operation status of home appliances. The power sensor driven without a battery using the energy harvesting is developed. The power monitoring system handled in this paper uses the developed home appliance power sensor. However, the power monitoring system does not take measures against hardware failures of gateway. Therefore, home appliances are unable to be monitored when failures occur in the gateway. We propose a method of redundancy. Our proposed method is achieved by communication in which the power sensor does not distinguish the gateway and alive confirmation messages between gateways. We implemented and experimented with the proposed method. We confirmed that failover is executed when a failure occurs. The downtime was a minimum of 69 s, a maximum of 108 s, an average of 92 s.