Canadian tire has a 300w Power Inverter on sale for 30$ till Sunday. I picked one up. It can be hooked up to a battery or your car cigerette plug. So I know now have two backup plans. My first one which is the self contained batterry w/ inverter and now this inverter that I can use with my marine deep cycle battery. I should have pretty much 12 hours or so of battery back up if needed.
Also this inverter comes with two outlets. nice..
similar to this but 300w
http://www.canadiantire.ca/assortmen...rtment=primary