I am planning a fun weekend but we are not sure we will have a 110v power source nearby. Just in case I decided it may be a good idea to use a APC battery backup and parallel more batteries together for a longer run time. Also in the same unit I could have a 12 volt charger to charge batteries. Once I come back I will just have a really buffed up battery backup ready to use. I am going to use two small computer cases , industrial drawer handles , rolling casters ect. These are the donors. The idea is to power a few laptops / net books all day which are wattage anyways.