Re: [Electric Boats] Seahawk 17 Project

 

Thanks for the response PISQUE. I was shooting for a range of approximately 20 miles for days when we just want to totally relax, fish out of the boat or take a nice evening jaunt after the winds have died. I figured on 3 115ah batteries for a total weight of 150lbs or so which I'm not too concerned about as the weight could actually be used up front. I figured this out using Everstart 27DC batteries as a guide and they're what I'm referencing for amp hours & weight. I'm COMPLETELY guesstimating a draw of 25 amps to achieve a speed of 3 knots from the Endura 55 (max draw is 45 amps from what I can find) but it seems reasonable to me on seeing what other boats are posting. I think you are right that this would be overkill on a normal basis and I think I might start out with 2 batteries or even 1 and take the kicker along before deciding. Do you think a 25 amp draw for 3 knots is reasonable with my bilge keels? What do you think about a thru hull installation behind the keel in this boat? Here's what I came up with (thanks to all the great info here!) and what I was basing my idea on -

3x115amp hours=345 total available amp hours + 150lbs additional weight in boat at a cost of $240 (+-)

345amp hours/2=172.5 useable available amp hours (not draining batteries below 50%)

172.5amp hours/25amp draw=6.9 hours of use @ 25 amp draw 

6.9hoursx3knots=20.7nm or 23.8 mile range @ 50% discharge which is close to what I'm shooting for as a max daily distance but doesn't take into account wind, current, less than perfect charge state, cd system, VHF etc. 

2x115ah=230 total available ah + 100lbs of additional weight at a cost of $160 (+-)

230ah/2=115 usable available amp hours (not draining batteries below 50%)

115ah/25amp draw=4.6 hours of use @ 25 amp draw

4.6hoursx3knots=13.8nm or 15.87 mile range @ 50% discharge

1x115ah=115 available ah + 50lbs of additional weight at a cost of $80 (+-)

115ah/2=57.5 usable amp hours (not draining batteries below 50%)

57.5ah/25amp draw=2.3 hours of use @ 25 amp draw

2.3hoursx3knots=6.9nm or 7.94 mile range @ 50% discharge

Thanks,

Bill

__._,_.___

Reply via web post

Reply to sender

Reply to group

Start a New Topic

Messages in this topic (5)

Visit Your Group

• New Members 1

• Privacy • Unsubscribe • Terms of Use

.

__,_._,___