Canadian Tire puts the Noma units on sale periodically. Some of them can be used with a daisy chain of deep charge marine batteries. Car batteries are not suitable because they are shallow charge designed for multiple short runs (starting vehicles).
If you have a huge tank, wallet and other requirements for power for the rest of your family, then a natural gas generator is the best option. They start at around $4000.00.
The easy option is a DC air pump with a power outage sensor. Air lifts can be hidden in your reef and be on standby. Air lifts are more efficient than powerheads. The only reason we don't use them all the time is noise, salt creep, and aesthetics. None of these are issues when the power goes out. Air driven protein skimmers that drop right into the tank are also a good idea if you live in a remote area where power outages are potentially more frequent and longer in duration.
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