Looking For A 56 Volt DC Outdoor Power Supply..

Hoping someone can help with this, I've been going crazy trying to find something that fits the bill.  I've got quite a few sites now with a LCom box, consumer battery backup, and switch configuration.  The battery backups don't last more than a year or so, and the whole assembly is huge.  I've begun replacing them with Edgepoint switches and Tycon outdoor switches on new projects, but I don't get battery backup that way.  I use this PSU currently: https://www.amazon.com/gp/product/B00NAU2O5G/ref=oh_aui_detailpage_o06_s00?ie=UTF8&psc=1  I'd like to use something like the Altronix Reserv system, but I need something in the 56v DC/ 5 amp range and I can't find anything similar in Altronix's line up.  Any ideas?  Thanks in advance!