The amount of time that backup power is expected to be needed determines the capacity of the batteries. The larger the battery set, the longer the loads will operate during an outage. The overall size of an ESPS system is limited only by budgetary constraints. It is useful in urban settings to provide basic electricity and power for personal electronics and appliances in the event of blackout or act of Mother Nature. Standby power is usually reserved for hours, maybe days of backup electricity, and found in international applications which are more urban, than rural.
Inverters are incredibly quiet.
Nighttime operations become routine, rather than an inconvenience. You're your own power company. Trace inverters are ready to use, right out of the box. All Trace inverters include an automatic transfer switch. Trace inverters provide two and one-half to three times their rated continuous output for large startup loads.