[Electric Boats] Re: Albin Vega direct drive?

 

Well to get out of our marina I like to go about 2.5 kts, which our boat does in the marina waters at about 20 amps input, which is right at 1000 watts.  It takes us about 10 minutes to navigate through all of the slips and fairways and exit the breakwater, so that is a total of 166 watt-hr.   Technically we could raise the sails there but being new to this boat and only having sailed it a couple of times now, we motor out to a bit more open water at about 3.5 knots using 30 to 40 amps depending on wind and current (sometimes we are fighting a knot of current sometimes we have that current helping us and do 4.5 knots).   If you go with the upper end, then we are using 2000 watts to get to open water, which for me is getting past the red daymark.  This takes about 20 minutes at 3.5 knots, so that uses up another 666 watt-hr. 

So the long answer to your short question is it takes us about 832 watt-hr to get from our slip to where we raise sails.  Our battery bank is 12 Lifeline AGM GPL-31XT with a rating of 125 AH each, so we have 48V at 375AH, or a maximum of 18,000 watt-hr at the 20 hour rate (20 hour rate would mean only drawing a max of 18.75 amps from our bank, or around 900 watts).  I figure banging on the bank pretty hard, knowing I will recharge it to full at the dock I can take the battery to 70% depth of discharge and still get several hundred cycles out of it.  I think Lifeline's chart says I would actually get something like 600 cycles before the bank capacity has dropped 20%.   Since we plan to switch to a larger lithium bank soon, I don't mind banging on these a bit harder than most and have no problem taking 70% out of them.

So realistically, at something like 3.5 to 4 knots using 2000 watts I figure we can pull 10kw-h out of the bank, or a range of  17.5 to 20nm.   We also carry a Honda EU2000i for emergency and could run at 2000 watts with that and a lot of noise.

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Posted by: lightdoesnotage@yahoo.com

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