"Tell me your 30' doesn't really weigh 16 tons!"
DOH!!! You are right. It's 16,000 lbs or 8 tons. Even when loaded with beer. :)
Capt. Mike
Sent from on board BIANKA
http://biankablog.blogspot.com
From: Grapeview Point Boat Works <boat_works@yahoo.com>
Sender: electricboats@yahoogroups.com
Date: Sat, 10 Jul 2010 19:00:14 -0700 (PDT)
To: <electricboats@yahoogroups.com>
ReplyTo: electricboats@yahoogroups.com
Subject: Re: [Electric Boats] Re: Battery charging time
Mike: Tell me your 30' doesn't really weigh 16 tons!  My very high D/L ratio 30' ketch weights 14,000 lbs.... -Tom Sat, 7/10/10, Mike <biankablog@verizon.net> wrote:
From: Mike <biankablog@verizon.net>
Subject: Re: [Electric Boats] Re: Battery charging time
To: electricboats@yahoogroups.com
Date: Saturday, July 10, 2010, 6:21 PM
| Aaron: My 30 foot sailboat is 16 tons. I found that I can operate at about 3 knots with just the 900 watt Zivan NG-1 charger alone even when operating the Honda 2000 in eco mode. I too keep thinking It would be nice to be able to use a Honda 1000 since the Honda 2000 is probably more than I need. But, the 1000 would I think be under powered for my charging/motoring needs. Something in the 1200 to 1500 watt range would probably be perfect. Capt. Mike
--- On Sun, 7/11/10, Aaron Williams <akenai@yahoo. com> wrote:
From: Aaron Williams <akenai@yahoo. com>
Subject: Re: [Electric Boats] Re: Battery charging time
To: electricboats@ yahoogroups. com
Date: Sunday, July 11, 2010, 12:49 AM
| Thanks Kirk I am just trying to use the honda 1000 as an example compaired to a 10 kw. I want to go with an electric drive but my sailboat weighing in 20,000 lbs would suck up a battery pretty darn quick. I am getting the idea that I may be able to run about 4 knts using only 4kw of available power so a small generator would give me that plus a little bigger to charge batteries while running. Aaron
--- On Sat, 7/10/10, Kirk McLoren <kirkmcloren@ yahoo.com> wrote:
From: Kirk McLoren <kirkmcloren@ yahoo.com>
Subject: Re: [Electric Boats] Re: Battery charging time
To: electricboats@ yahoogroups. com
Date: Saturday, July 10, 2010, 4:18 PM
I dont know if the new Honda works better than the one Home power tested a few years back but their review wasnt as well as one may like. A resistive load takes current proportional to the voltage but a battery is a no load until the output voltage equals the battery voltage plus rectifier drop. They intimated the units reulator was a bit upset at this and only achieved about 2/3 of rated output. Might want to read about it if you can. Kirk
From: hardy71uk <p0054107@brookes. ac.uk>
To: electricboats@ yahoogroups. com
Sent: Sat, July 10, 2010 5:28:23 PM
Subject: [Electric Boats] Re: Battery charging time
Well I estimate on the back of an evelope as follows-> takes about 1.2kw hours per battery . so 4.8kwh total . if you had a 100% efficient charger that would take about 6 hours for an average input of 800watts. Say 8 to 10 hours for a reasonably efficient real charger. I'm guessing that the honda 1000 could probly provide 800watts continuous. Efficiency wise I think we are talking around 6.5KWH input for about 4KWH to the motor. Chris S --- In electricboats@ yahoogroups. com, Aaron Williams <akenai@...> wrote: > > If I had a 48 volt system with 4 12 volt 100 amp hour batteries how fast could they be charged. If I had a 10 kw generator how much would be wasted. > What I am wondering is if one of the Honda 1000 gen sets is more than adequate? > > --- On Fri, 7/9/10, hardy71uk <p0054107@...> wrote: > > > From: hardy71uk <p0054107@...> > Subject: [Electric Boats] Re: Anyone have experience with 144 volt motor systems? > To: electricboats@ yahoogroups. com> Date: Friday, July 9, 2010, 2:38 PM > > > > > > > > Good points . but usually the greatest efficiency loss comes from using a gen to charge batteries . Best practice might be to charge from shore power and run the motor some of the time from the generator to conserve the battery power. DC motors can be run from an ac supply via a simple rectifier. >
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