Depends on the size of battery backup and number of things hooked up to it. You have to calculate the watts of each item hooked up against the capacity of your battery backup. Normally each battery back has a chart of time on the box. Hope it helps.
i have used this for many basic 16 camera systems and it works great, if you need more power for PTZ or long runs you can do 2 of the 8 camera power supply's for some reason they are actually higher amperage on 8 then they have for,the 16 so 2 of them are much more powerful.. but only if you need the extra, because this one powers most without a sweat.
I was initially impressed with the feature set for the money with this power supply. That turned to disappointment when the power supply failed after less than 4 months. The load on the supply was less than 25% of its rated load. I would not recommend this product for purchase, especially if it is for CCTV camera's that are protecting anything of significance.
Truly sorry for any inconvenience while using the Product. From your feedback, it sounds like you may have a defective item. If you can please reach out to us direct at email@example.com with your order information, we can look into see what options are available for replacement.
June 4, 2017
Supplies ample power for all cameras, good terminals for connection. Could have used a grounded cord for the, changed the original one for a three wire cord.