UPS as battery backup

[ShakeyGizzard]

$500 to $600 (depends what battery you upgrade with). Basic wiring skills needed plus a safe place to store this. Cable and connectors extra.

UPS - Tripp Lite SMART1500LCDT ($234)
Batteries: Interstate Deep cycle battery ($160 each)
Video how to: UPS BATTERY UPGRADE USING CAR BATTERIES

Edit: The video shows battery hook up for 24 volt, if
your UPS is not configured for 24 volt.
batteries would need wired for 12 volt (+ to + , - to - )

 

[ShakeyGizzard]

Would still not run heaters if you know power will be out for extended periods, these UPS use lead acid batteries, charging up for use may take longer. Sealed lead acid battery for indoors