Hi Woody.. My battery is rated at 3Ahr, and the Rule 500 draws 1.9 amps at 12 volts. Your formula yields 1.58 hours of continuous pumping. Far less than the 35 continuous hours I mentioned (can't remember where I got that figure), but still fine. At 4 minutes per flooding, this yields 23-24 bailouts between battery charges. More than a week in standard-to-rough conditions, even with rolling practice; or good for 2, perhaps 3 days of surf training (although my roll is getting better). You've convinced me -- some (warm) day I'll run a continuous pumping test. Lessee, I'll dig out that book I've been meaning to read, ice up a beer or two, set the kayak in the back yard, run the hose into the boat, start the pump and my timer, and then just wait for the sound of the pump to stop..... Science is tough, but someone's got to do it. Bob From: Robert Woodard <woodardr_at_tidalwave.net> Date: Tuesday, February 01, 2000 8:26 PM >Hi Bob, > >My Attwood 450 draws somewhere between 2-3 amps. At 3 amps that means my 3 >Ahr battery would run it for 1 hour, so I think it draws a little less as I >have ran it for over an hour without any problems (in testing). You should >take the current draw, divide that into the Ahr rating for your battery, and >that will give you how long (in hours) that the pump should operate. > >Woody *************************************************************************** PaddleWise Paddling Mailing List - All postings copyright the author and not to be reproduced outside PaddleWise without author's permission Submissions: paddlewise_at_lists.intelenet.net Subscriptions: paddlewise-request_at_lists.intelenet.net Website: http://www.paddlewise.net/ ***************************************************************************
Why not just run the discharge line back into the cockpit? (Unless you wanted to know how many gallons you could pump on one charge). Might I suggest a good porter or stout...good malty relaxing beer...mmm Shawn Bob Volin wrote: You've convinced me -- some (warm) day I'll run a continuous pumping test. Lessee, I'll dig out that book I've been meaning to read, ice up a beer or two, set the kayak in the back yard, run the hose into the boat, start the pump and my timer, and then just wait for the sound of the pump to stop..... Science is tough, but someone's got to do it. Bob -- Shawn W. Baker 0 46°53'N © 1999 ____©/______ 114°06'W ~^~^~^~^~^~^~^~^~^\ ,/ /~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^ baker_at_montana.com 0 http://www.missoulaconcrete.com/shawn/ *************************************************************************** PaddleWise Paddling Mailing List - All postings copyright the author and not to be reproduced outside PaddleWise without author's permission Submissions: paddlewise_at_lists.intelenet.net Subscriptions: paddlewise-request_at_lists.intelenet.net Website: http://www.paddlewise.net/ ***************************************************************************
This archive was generated by hypermail 2.4.0 : Thu Aug 21 2025 - 16:33:09 PDT