I have a APC BACKUPS 500 with a dead battery, it can supply up to 300 watts continuously. However, at full tilt my computer can use up to 1000watts and the monitor uses about 150. With standard use my computer uses around 400watts or so. Would it be possible to use 2 UPS both wired in parralel to a single deep cycle lead acid battery. Would this work? The thing I'm worried about is wouldn't both UPSes try to charge the battery at the same t ime, and would that be ok? Red is positive and blue is negative in the picture. I would hopefully get around 1 hour of backup. Also, is there any way to make my computer go into energy conservation mode when the power goes out? I have a 2008 8 core mac pro.