Oh, no - no saving face here by saying I meant one thing when I wrote another. I just messed up the arithmetic. -- Mike "Rocket J Squirrel" Elliott 84 Westfalia: Mellow Yellow ("The Electrical Banana") 74 Utility Trailer. Ladybug Trailer, Inc., San Juan Capistrano Bend, OR KG6RCR
On 9/5/2009 11:54 AM Dave Mcneely wrote: > 168 x 0.2 equals 33.6 . 168 /0.2 equals 840 . > > Do you mean amp-hours per day, or amps per hour per day (which is what > you wrote)? > > Just making sure. > > > On Sat, Sep 5, 2009 at 1:13 PM , Karl wrote: > >> I calculate that usage at 33.6 a/h per day. 24 x 7 = 168 , divide by >> .2 >> = 33.6. >> >> Rocket J Squirrel wrote: >>> Hi Malcolm. >>> >>> A 24-hour run of your refrigerator, if it draws 7A, and has a duty >>> cycle >>> of 2/10 (two minutes out of ten) will consume 4.8 amp-hours (Ah) per >>> day. >>> So if your numbers are correct, and if you wanted to never discharge >>> your >>> deep-cycle batteries too deeply (say never less than 80% discharged >>> so >>> they last longer), then a five-day run of (call it) 5Ah per day would >>> require 25Ah, and a battery with a 30Ah rating should do the job. > |
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