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Date:         Fri, 20 Aug 1999 23:35:27 -0400
Reply-To:     David Beierl <dbeierl@IBM.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         David Beierl <dbeierl@IBM.NET>
Subject:      Re: Optima d750-S vs. d750-U
Comments: To: Todd Last <Rubatoguy@MINDSPRING.COM>
In-Reply-To:  <37BE13A7.77B0C5EF@mindspring.com>
Content-Type: text/plain; charset="us-ascii"; format=flowed

At 19:49 8/20/99 -0700, Todd Last wrote: > > Also, can anyone give me a ballpark estimate of how long the deep-cycle is > > good for between charges? That is, if I go camping for a week (in one > spot), > > how many total hours (about) can I expect to get from the battery for cabin > > lights, CD-player, stereo, etc. before the thing goes dead?

Todd, that's what the amp-hour rating is for. Measure or calculate the drains of the loads you use (in amps) -- if the total is 1/20 or less of the battery amp-hour rating, just divide that rating by your measured load to get *maximum* life in hours. If the total is more than 1/20 (not likely) your available time will be less b/c batteries have progressively less capacity as the discharge rate goes up.

I can put more words around all that if you need...

Amps = watts / volts, in case you have a wattage rating for a lamp or whatever. The watt rating of your stereo doesn't count, that's output power, not input.

david David Beierl - Providence, RI '84 Westy "Dutiful Passage" '85 GL "Poor Relation"


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