Any ideas on a system to notify a client if the power trips off? Ideally a call or sms to their mobile. It's to avoided wastage of chilled/frozen foods.
You need a autodial battery back-up system with more than one alarm input to cover temp rise in fridge, brown out with as mentioned a delay on activation but if the stock is so costly then i would consider a back-up genny with auto-dial warning.
Although this isn't really designed for what you want it would appear that you can make it work Hot Mini GSM SMS Vehicle Car GPS Tracker Tracking Device TK103A Alarm System VG3 | eBay it's £48 plus you will need a 12v transformer and a relay to trigger it.
Basically it's designed for a vehicle alarm/tracking system. So you can set it to use a contact to trigger (maybe a small relay/contactor connected to the critical circuit.) it to send a message to a nominated phone.
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