Sea state will have something to do with consumption. If your pilot is pulling an average of three amps, multiply that by the number of hours it is working, and that (plus a little) is the Ah your battery must supply.) Leaving us with the awkward but correct " amp hour/hour" label. Amps is a measure of current amp hours is the proper measure of stored current. (As an aside, 'amps per hour' doesn't quite work. 1A is not a bad number to use for your calcs. We've used 3A as a peak draw for our TP10 in moderate ocean swell, 1A as a median & that seemed consistent with battery drain & spot multimeter readings. Generally for these small autos, figure half an amp at idle & five amps at full thrust. A pilot will use more juice if making large, highly-loaded corrections - or if making many, frequent small corrections. Couple different ways to think about power consumption.
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