Anyone who's into sail/power cruising or RV/caravanning has encountered the problem of "How can I run <appliance X> from batteries?". Alternatives to the appliance you are familiar with may be uneconomic, have a higher running cost or produce an inferior result, hence your desire to run the actual appliance. Often the right answer is "Forget about it!" but unless you do the analysis properly, you don't *KNOW* that, and it may have benefitsthat make it worthwhile, or you may be able to share the battery/inverter system with other appliances, that make it economic to do albeit very expensive. e.g. a friend bought a boat that the previous owner had installed a 1KW Microwave on. The power budget to run it for 5 minutes was frankly insane as it drew about 100A at 12V through the inverter, and for battery operation would have required either replacing their house bank with 'leisure' batteries with a CCA rating, with considerable loss of available capacity and lifespan, or doubling its capacity, and replacing the charger and alternator. Their original intention was to rip it out and regain the locker space, but their first trip was in absolutely horrible weather and it turns out that it earns its keep in bad weather to heat pre-prepared, pre-packed individual portion meals for the crew, when its too rough to cook safely and you are either motor-sailing anyway or are willing to run the engine, adjust sail and maybe even alter course to stabilise the boat to serve a meal, so as long as the engine revs are high enough, battery capacity isn't problem. Its also handy in harbour with shore-power available, for convenience or when entertaining to off-load some dishes from the limited galley stove capacity.
The 1200W rating is likely to be the maximum possible instantaneous power including initial inrush current for the control electronics.
Maximum actual power consumption is likely to occur if if the machine is doing a 110 ml lungo (long) pour starting from cold at a low room temperature.
@_metRo,
What sort of battery installation did you have in mind? I doubt a 'man portable' solution would be practical.
What test equipment do you have available to measure (and preferably log) the true power and check for waveform distortion that might upset an inverter. E.g. if you have a 2 channel or better DSO that can either do waveform maths and averaging, or can save captured waveforms in a format that can be transferred to a PC, then all we have to do is figure out how you can hook it up safely.
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