Using a UPS for an independent solar power supply

In "Adapt solar panels for off grid power in Queensland floods" I asked it would be possible to charge the battery in a UPS from a solar panel. The idea would be to disconnect a grid connected solar array during an extended blackout and use it to provide some power in a home or emergency centre.

The reason for using a UPS was that they are pre-packaged and self contained, making it easier and safer to set up, than by using separate components.

Since then I have found "Using a UPS for an independent power supply" from UWA. This describes using a surplus UPS in an independent solar power system. The UPS is used as a low cost DC to AC converter. The original UPS battery is replaced with a larger unit and a standard solar batter controller is used, in place of the charger in the UPS. As well as the web page there is an article and presentation slides.