Just as I was driving home from breakfast a little voice in my head told me that I messed that one up! The 24-hour consumption of a 7A reefer running 2 minutes out of ten is (counts on toes, scratches head), uh, 34Ah. I leave it as an exercise for the student to plug that number into every place I used the incorrect value. -- 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 9:55 AM mark drillock wrote: > Check that math! > > I think he needs a lot more battery capacity than that. > > Mark > > 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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