I bought an APC ups battery backup. It is a 700va. Is that enough to just shut the stove down in case we lose power so that the house doesn't fill with smoke? We have had it happen before. (I need to get a rise on our venting as we do not have one, it just goes out 3 feet from the house.) Also, we have a generator Powermate Portable 3250 watt just in case we lose power for a longer period of time. Will these be good enough for my St Croix afton bay???