Wednesday, March 3, 2010

Re: [Electric Boats] Battery charger limits and the Honda 2000 generator

 

Dave H.

For what it is worth I am pretty sure that you can get at least 2 knots at .750kW. People get 1.2 knts with sculling oars. The key is a clean bottom and prop. I just got my bottom and prop cleaned and it was a dramatic performance nudge. I got 3 knots at 1kW. Of course this is only in dead calm water in the marina. This is the first time I was able to monitor my performance so well because I recently installed a new meter.

By the way, I can highly recommend the Cycle Analyst. I bought the high volt/current model in the large screen format. They have every imaginable parameter available, and have excellent customer support. They are hand built in Vancouver Canada. I have not done this but you should also be able to wire in a speedo log to get Watts/mile and a myriad of other intersting electro-data.

I will try to post pictures of the Cycle Analyst installation to the files section.

Fair winds,
Hans
From: Dave Hackett <dave.hackett@ns.sympatico.ca>
Subject: [Electric Boats] Battery charger limits and the Honda 2000 generator
To: electricboats@yahoogroups.com
Date: Wednesday, March 3, 2010, 11:03 PM

 

I've seen some post on this group that they can run their Honda 2000 generator plugged into their shore power plug and use their battery charger to "limp" home.  I'm wondering about the numbers.

 

If I have a quad battery charger (eg Pro Charge) rated at 15 amps per battery (x4 = 48v), the full draw on the generator would only be (4 * 15A  * 12V) = 720 watts.  I just can't imagine getting even 2 knots at this power level.  Am I missing something or do the chargers produce more then 15A when the draw out the other end is greater then 15A?  Would this potentially burn out the battery charger?

 

DaveH

 

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