I want to purchase a small backup, like a Jackary, to run a light and maybe tv during blackouts. I think most of them will work for this, but between blackouts, I want it to power a coffee cart with an espresso machine and grinder. The grinder is only about 250 watts, so this should not be a problem, but the espresso machine is 1400 watts. If I am doing the math right, this means the 12 volt battery would be providing 117 amps max, for about 15 minutes 1400/12= 117 amps, or about 29 amp/hours. It will only be used once or twice a day, so In between uses, I'll plug it in to the wall to keep it charged. Given these parameters, do I just look for something that can provide at least 1400 peak watts or do I need to be considering something else? Any suggestions?