Has anyone here ever tried something like this backup system?
http://reefcentral.com/forums/showthread.php?s=&threadid =64918
The thread on reefcentral is so old that the diagrams are gone. I'm interested in it if it really keeps a pump going for several hours.
For a picture of a completed unit, see dbranca's listing for his 120 complete reef setup. There's a picture of one there.