Low Cost Outdoor UPS

I own a small WISP and need an UPS in a small enclosure at the bottom of my towers to provide temporary power for when the grid drops for a few minutes/hours.

• $40   - GE Breaker Box - Home Depot
• $25   - NES-75-48 - Meanwell 48V 75W DC power supply.
• $90   - TP-SCPOE-2424HP - Tycon Power Systems 24V charge controller and regulated power output.
• $10   - POE-PowerTap x2 - Tycon Power Systems POE Power Tap
• $110 - 12V 12AH Battery x2 - Interstate Batteries 12V 12AH Battery

This is often coupled with a multi-port POE injector from Wifi-Soft and a router for a WISP tower location.

• $23 - WS-POE-8-ENC - 8 Port passive POE injector.
• $79 - RB-2011L - Mikrotik RouterBoard 2011L.
• $10 - Sticky Standoffs

This comes to $387 for an outdoor UPS with a run time of about 8 hours without power for 2 - 8 watt radios and a RouterBoard.

Here is a similar version of what I have described.