Date:         Sat, 5 Sep 2009 12:26:13 -0700
Reply-To:     Rocket J Squirrel <camping.elliott@GMAIL.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Rocket J Squirrel <camping.elliott@GMAIL.COM>
Subject:      Re: Run time to charge Aux battery
Comments: To: mark drillock <mdrillock@cox.net>
In-Reply-To:  <4AA297F4.7070708@cox.net>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

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.
>>
>> ..............
>