Backup selection for a small store starts with outage evidence and the load to protect. A generator addresses power supply; a passive volume targets only the lot placed inside, so their coverage differs.
Use records to define the need. Keep an event timeline for outage start and end, restoration, alarms and product readings. Define priority product volume, required protection period and decision owner from your own procedure.
Compare options using tests and cost
For a generator, verify critical circuits including refrigeration, transfer and maintenance/fuel needs. For a passive volume, measure a real or safe representative load using the supplier's coolant preparation instruction; do not assume an untested hold time.
Assess purchase and operating costs alongside protected lot volume and test findings. Verify the backup plan through controlled exercises and record owners for faults and improvements.