Power meter

I'm shopping right now myself. Still studying the videos on youtube, and reviews on Amazon. Plenty of options for purchase.
 
I'm researching to add to a real basic kit on a Sunseeker Fat-Tad recumbent. The most important feature I'm looking for is Amp hours consumed. I'd like to have a more accurate indicator of power consumed. Lots of generic units out there, so far it just looks like a slight variation in accuracy;
https://www.amazon.com/s/ref=nb_sb_noss_2?url=search-alias=aps&field-keywords=rc+watt+meter&rh=i:aps,k:rc+watt+meter

ok thanks. i am thinking power as in cycling power.....the metric of how good your training is
 
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