Back Up Power For Electronic Access?

We have numerous remote facilities that we are adding electronic access. Site users are asking how long will the doors stay powered in the event of power failure? The vendor is stating 4 hours.

Any suggestions as to how to make this 72 hours?

The doors will be fail secure so once the power is gone how do we get in? We talked about a back up key but we will most certainly lose access management(which is very important). Any suggestions?

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