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.