I am rebuilding a site so that it is going to run straight DC to all the equipment on site. So the AC power will come into the nema box and from that it will go to a AC to DC converter. Of this I will wire all the equipment up to the AC to DC converter along with some batteries to back up the site if AC fails. What I am looking for is some sort of power monitor that can monitor the AC power at the site and send an alarm if the AC power fails. This way I know we are on battery power and we need to send someone out to check out the power. I don't really have room to fit a UPS onsite to monitor power through it.
Has anyone used anything like this or know of any device that would work for this application?