Efficiency is the only difficulty with that. This is for a battery-powered surveillance system in a very remote area. I may have to install a small solar system to supply at least some power between the times the battery can be charged.

Taking DC from a battery, converting it to AC through a modified sine wave inverter and then into the computer power supply where it's turned back into DC (DC-AC-DC) to run the computer wouldn't be a problem if there were a ready source of power. Each step along the way has a cost which would be nice to avoid if possible.

An oversized modified sine wave inverter would be around $80, not a deal-breaker if not for the inefficiency.

Since I posted I found a company which has 12VDC input power supplies for an ATX for $147, which may be the only way to go.

Anyway, thanks for the response. In certainly is a reasonable solution under most circumstances.

Arf