Really enjoying our Serenity. We get electric "glitches" every once in a while and just got a new smart meter.Thank God they just ran conduit for utilities in our park and the smart meter is 60 ft from our head instead of 15 ft. Anyway, yesterday I plugged the shopvac into the same plug mount surge protector the stove is in. I ended up pulling the s/p out with the stove plug rather than just the vac. Just that second or two the shove went into shut down. We haven't had a "glitch" since the stove started so I don't know what would happen during that flicker of interruption.. Anyway I'd like to explore battery back up options that aren't to expensive. Do they respond quick enough before a shutdown ? What for run time can you get ? I have propane for the furnace. Any thoughts/ideas ? Thanks. GBY