UPS for supplying power?

Theoretically possible for smaller loads however wouldn't last very long. Smaller lights and TV would be possible , for all intensive purposes same as an inverter. You can't beat big AGM batteries or nice quiet Gennies if you have to.

I have used them at times , easy to get into and they have a 12 volt gel cell in them , simply run the battery leads to your vehicles supply and away you go.
One thing to be aware of , I don't think their "continous" rating would be very high so keep the load within reason.

Dave L.

The batteries in a small UPS are gel-cel, and they won't do the job you want. They fail quickly if they are discharged often.

The exception is the very large UPS which uses AGM batteries the size of a "normal" 4x4 battery.

G'day Han,

Sorry for not replying earlier but I only came across your question tonight and after reading the last fellas' comment about what type of battery is used in a UPS I had to write to you!
UPS packs come with AGM or SLA batteries not Gel and they certainly don't put 'normal 4x4 sized AGM batteries' in them! You can use them on the road as long as you charge them in accordance with the requirements needed to charge AGM batteries which is quite simply to ensure that if charging on mains do not exceed 14.8 volts. Alternatively you can charge them from a good quality gen like Subaru, Honda or Yamaha or from a Solar Panel as long as it's regulated.
I hope this helps but if their is anything else you need please feel free to visit my website at homeof12volt.com and tap into the link with my name on it.
Cheers,
Rob