ip cameras system battery backup

[Ijferguson]

Hello i am installing an 8 camera hikvision ip camera system and wondering how i can include a battery back up to the design if the power fails,
The system is installed in a shed and am wondering is there any kind of ip66 rated wall mounted cabinet with the battery back up included in it that you can buy?

Thank you

 

[Mart68]

I use a mains power battery backup unit. the one i have gives me about 1 hour of backup run time (NVR + 11 POE cameras).
You can by units that will last longer, but your be looking at well over £300 for 4 plus hours of power backup.
If the power is out for longer i connect up both of my small 3kw generators so i have some power at home.