On 12 Apr 2005 at 15:25, Keith Wrage wrote: > A couple of questions: What kind of operational duty can > you expect from a set of fully charged batteries? What is the non-use > discharge rate (e.g., if left sitting in your boat for 3 weeks, could > expect the pump to empty your boat 6 times?). The batteries I bought are 2300mAh NiMH. The complete set, therefore is 14.4V 2.3Ah. Since my bilge pump draws 0.9A at peak (measured from my Attwood 625 - most pumps are less efficient), that means I can expect: 2.3Ah/0.9A = 2.6 hours of operation. Realistically, the batteries are probably over-rated (most AA NiMH are according to one of the digital camera web sites). As such, I'd expect at least 1.5-2 hours of operation. Since it takes 3-5 minutes to empty the kayak (not a full cockpit, but typical of a wet exit) then I've got the ability to easily do 25-30 pumpouts on a single recharge. The discharge rate is roughly 0.4C, so I don't expect that the time available is reduced significantly by a high current draw. The worst case that I've done is three pool sessions over two weeks and about 6-10 pumpouts per session on a single charge. Most pumpouts were less than 3 minutes, though. There was lots of capacity left, if short recharge times are an indication. After a month on the shelf, you can expect the batteries to have about 60% of their full capacity. That means about 15-18 pumpouts. Mike *************************************************************************** PaddleWise Paddling Mailing List - Any opinions or suggestions expressed here are solely those of the writer(s). You must assume the entire responsibility for reliance upon them. All postings copyright the author. Submissions: PaddleWise_at_PaddleWise.net Subscriptions: PaddleWise-request_at_PaddleWise.net Website: http://www.paddlewise.net/ ***************************************************************************Received on Tue Apr 12 2005 - 14:30:06 PDT
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