You really need to look at non-minimalist solutions. For instance, a very high capacity, deep-cycle battery (actually probably a bank of a couple of batteries) or a fuel generator solution (prefereable propane based) if you need to cover that length of outage without external assisance. Both would ...

I am not technically minded but I have been trying to find a batter backup solution for my ResMed VPAP St, S9 series. I have spoken to ResMed several times. If I need my Bipap for more than one night during a power outage such as Hurricane Sandy or perhaps an earthquake in California, I would need t...