Advances are being made in all areas but I think the battery aspect is by far the most important at least for someone like me. If you are a hoping to retire and cruise how fast you get somewhere is far less important than the fact that you GET there, and getting there cheaply comes in a close 2nd. If I am not in a hurry I can wait for my bank to charge. Also the weight is a huge issue with a tenfold reduction in weight the size of the boat can come down also bringing down the hp requirement to drive the boat. So if you are designing a boat for purpose the additional cost of the new batteries may not be so expensive if it brings down the cost of the boat. With this type of battery advancement a very small diesel dc generator can easily top things up when required and the advancement in acceptance speed of charge is also a huge thing.
So for me I will be more than happy if battery technology outpaces charging technology.
Nick
From: electricboats@yahoogroups.com [mailto:electricboats@yahoogroups.com] On Behalf Of Steve
Sent: November-20-11 6:19 AM
To: electricboats@yahoogroups.com
Subject: [Electric Boats] Re: new lithium battery breakthrough?
I guess the point I'm trying to make is that your charging capacity is more important than your battery capacity especially when you are offgrid. Increasing your battery storage without a corresponding increase in charging capacity doesn't accomplish very much. A bigger gas tank in your car isn't going to make the pump at the gas station pump any faster. A high battery acceptance rate isn't useful if the solar panels can't provide the energy. Waiting for better batteries before investing in an electric drive diminishes the importance of other considerations in making the conversion. Thanks. Steve S.
--- In electricboats@yahoogroups.com, "Carel Ruysink" <c.ruysink@...> wrote:
>
> I also did not make the connection and BTW allthough I did not do the maths I do not believe that an aircraftcarrierdeck full of PV panels could produce the needed 300.000 SHP for an aircraftcarrier.
>
> Carel
> ----- Original Message -----
> From: Carter Quillen
> To: electricboats@yahoogroups.com
> Sent: Sunday, November 20, 2011 4:10 AM
> Subject: Re: [Electric Boats] Re: new lithium battery breakthrough?
>
>
>
>
> I'm glad to hear I wasn't the only one that didn't quite get this one.
>
> And for the record, somewhere around 13-14% is new benchmark for PV efficiency and it's cost is down to like $1.25 a Watt right now. And you don't have to have an air craft carrier for a solar powered boat. Pontoon boats, launches, trawlers and a host of other barge like vessels have plenty of room over their decks for a sufficient solar array to power them real time off solar alone. With the 3 kW I'm installing on my boat I'll get 60 amps at 48V whenever the sun is shining and I've got room for 2 more kW when I get the money. That will provide over a 100 amps at 48V.
>
> Having a backup generator for continuous night running and cloudy days is still a good idea but not absolutely necessary.
>
> Carter
>
>
> From: Don Parsons <tdparsons@...>
> To: electricboats@yahoogroups.com
> Sent: Saturday, November 19, 2011 9:04 PM
> Subject: [Electric Boats] Re: new lithium battery breakthrough?
>
> Huh? So are your saying you would not welcome a battery that lasts 10
> times as long and only weighs 100 lbs just because your solar panels
> suck? I don't really get your post.
> Don
>
> --- In electricboats@yahoogroups.com, "Steve" <sstuller@> wrote:
> >
> > Having a lot of battery capacity and a high acceptance rate is secondary if you are offgrid and have to rely on solar panels. Sunlight delivers 1 KW per square meter to the earth's surface. Current panel efficiency is around 10%. That's 100 watts per square meter. Assuming 5 hours per day that's 500 watt-hours or 1/2 KWH per square meter. A 50 KWH battery bank would require one hundred square meters of panels to recharge the bank in one day. If you have an aircraft carrier you would have enough room for the panels. Otherwise you have to rely on the ICE if you want to recharge a a large battery bank in a short time. Thanks. Steve S.
> >
> > --- In electricboats@yahoogroups.com, "leemurs72" <jt.yahoo@> wrote:
> > >
> > > For those that are still a few years away from a battery bank purchase, this is possibly great news...
> > >
> > > http://www.northwestern.edu/newscenter/stories/2011/11/batteries-energy-kung.html
> > >
> > > Recent research shows promise for allowing a 10-fold increase in capacity and charge acceptance.
> > > It would be nice to have a 50kWh battery pack that weighs just over 100lbs...
> > >
> > > If it pans out, the it is a "that changes everything" breakthrough.
> > >
> > > Happy sailing!
> > >
> > > /Jason
> > >
> >
>
>
>
>
> ------------------------------------
>
> Yahoo! Groups Links
>
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