Hi William,
I have a few comments about your recent posts.
1. You mentioned a 1500 watt wind generator that can start operating at 7 mph and then continue at lower wind speeds. Look that up again and see what wind speed is required for it to output 1500 watts. I doubt it can do that at 7 mph.
2. Regarding your question below, I think everyone would agree 60 HP is plenty for a boat that size. And, yes, you can buy motors that produce 60 HP. But, how much battery storage is required to handle that kind of power? A lot! 60 HP is 44,760 watts. At 48 volts, that means the batteries have to supply 932 Amps. That is a lot of current. I have a 48 volt system on my pontoon boat that uses 4 large AGM batteries. Those batteries are very heavy but still can only store 105 Amp-Hours. At 60 HP, my batteries would be drained in 6 minutes even if everything was perfect and the batteries could deliver their full energy at that kind of current (which they can't).
I think a smaller motor would make a lot more sense for your type of boat - Greater than 3 HP, but a lot less than 60 HP - Maybe around 10. Just my opinion.
Pat
--- In electricboats@yahoogroups.com, bill garrison <wagarrison@...> wrote:
>
> Thanks Kevin,
> I have pretty much decided that my little 3.1HP motor and tranny/axle set up will not be enough to push a 40' x 14' houseboat very far, fast, or for very long. I have decided to use it to make an e-vehicle that maybe we can take with us on our trip to use whenever we dock somewhere. Do you think a 60hp electric motor would be too much for a houseboat this size?
>
> William A. Garrison
>
> --- On Thu, 2/10/11, Kevin Pemberton <pembertonkevin@...> wrote:
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> From: Kevin Pemberton <pembertonkevin@...>
> Subject: Re: [Electric Boats] Cruising with EP
> To: electricboats@yahoogroups.com
> Date: Thursday, February 10, 2011, 7:21 PM
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> Â
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> Hello William,
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> Positive track has a friction clutch built into the diff. This is
> not a solid axle and has spider gears but the ability to freely move
> is limited by the friction clutch. With a true diff. spinning one
> axle will make the axle on the other side spin the opposite
> direction. This same action will take place with posi-trac but will
> give resistance to this action.
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> Kevin Pemberton
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> On 02/09/2011 01:50 PM, bill garrison wrote:
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> Hello Robie,
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> What do you mean by positive track differential?
> Does it mean that one axle can turn, or not turn,
> independently from the other? How would I know if
> my axle has it? Thanks for your help.
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> William A. Garrison
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> --- On Wed, 2/9/11, hobt SV Qwave <marlborosounds@...>
> wrote:
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> From: hobt SV Qwave
> <marlborosounds@...>
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> Subject: Re: [Electric Boats] Cruising with EP
>
> To: electricboats@yahoogroups.com
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> Date: Wednesday, February 9, 2011, 10:35 AM
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> Â
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> One word of wisdom or food for thought.
> Befor you get too far down the rabbit
> hole, make sure that the Golf Cart
> Rearend/axle is a positive track
> differntal. Other wise the alt will lock
> up the free spinning side while the prop
> turns. We tried this a few years back on a
> differnt project only to find out we
> needed a differnt 3rd member.
>
> Cheers
>
> Robbie
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> --
> Ubuntu10.04, Acer AspireOne, Virgin Mobile 3G Broadband2go.
> Doesn't get any better than this!
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