Could you provide some power vs. speed measurements? Please include wind and current info. If you can choose an ideal course, and then turn 180 and make the same run back, the average values will be more accurate.
What batteries do you use?
If you need an ammeter, I can loan you an analog meter and the matching shunt, but mine's only good to 100 amps. Digital meters can be deceptive when reading rapidly fluctuating current. An old school shunt and simple meter integrate very complex waveforms into a simple accurate reading.
Be Well,
Arby
On Oct 6, 2009, at 7:35 PM, postal6@juno.
I have just installed four batteries powering an ElectricYacht 48 volt
system on an Ericson 27. Perhaps I am more fortunate in that my house
requirements are extremely limited to gauges, and radio. I will be
converting my lights to LED which should reduce electric consumption when
cruising at night. At this point in my usage I do not have a need for
gas or diesel generators to keep my batteries up. I do sail in the San
Diego area and the bay seldom initiates strong head winds as you
described. I believe in one step at a time, and when my electrical needs
increase I will have to step up to the new challenge. Careful monitoring
of your batteries during usage should avoid any unforeseen incidents. I
would rather rely on my electric motor than my old Volvo Penta.
Don Swanson
On Tue, 6 Oct 2009 14:24:23 -0700 (PDT) Rob Johnson
<dopeydriver@
Don , once again , you would need to be specific.
Batteries used to propulsion I believe should be seperated from house
batteries , otherwise if you got in a situation where the batteries ran
down , not only would you lose power , but also the use of a lot of
instruments , radio etc.
But even running a 20,000 lb boat on 4 batteries , where is it safe or
astute to do that ?.
Is it going to be enough to work for hours in to a head wind , or a
strong current ?.
I would dearly like to go to electric power , thats why I've been on this
forum for some time , but I've yet to see anything safe enough to use in
my environment , and I suspect the same would be true for a lot of other
forumites.
Regards Rob J.
--- On Wed, 7/10/09, postal6@juno.
From: postal6@juno.
Subject: Re: [Electric Boats] Repowering 40' 1975 20,000 lb sailboat
To: electricboats@
Received: Wednesday, 7 October, 2009, 7:56 AM
Usually electric propulsion systems are less weight than the original
gas/diesel set-up. Most sailing vessels utilize two batteries, and the
addition of two more is less than the weight of a half filled gas/diesel
tank. And comparing the weight of a gas or diesel engine, with
transmission, to a Mars electric motor is quite a drastic weight
differential. Less weight, less chance of flammable explosion, would
make any insurance entity happy. And if lead cell batteries cause a
safety concern, alternative
batteries are available.
Don Swanson
On Tue, 6 Oct 2009 20:48:56 +0200 "Alan Ford" <alanford@global.
writes:
Gday all
Replacing keel mass ( in a sailing vessel) with batteries is going to
affect your boats stability curve, and quite possibly then any insurance
cover you may have, as you are altering an original design parameter
pertaining to safety.
rgds
Alan
----- Original Message -----
From: aweekdaysailor
To: electricboats@
Sent: Tuesday, October 06, 2009 6:17 PM
Subject: Re: [Electric Boats] Repowering 40' 1975 20,000 lb sailboat
Futher confirmation that the "sweet spot" - sailboats < ~30' holds.
The combination of cheap mass-produced components (golf carts...) in the
appropriate power range (6HP) and the ICE weight-credit to
energy-capacity/
that, and the power requirements start to overwhelm the load-bearing
capacity of the vessel using lead-acid and the budget of the owner if
using LiPO4.
AC Motor with AC generators maybe? It's just a series-hybrid at that
point but could still be supplemented with a big inverter/charger and a
moderate battery-bank for harbor maneuvers.
Denny has suggested taking some weight off the keel to compensate - that
would help push the envelope to larger boats. In fact the first time I
read about an electric conversion it was a concrete-keel Rawson 30 where
the owner had chisled out the concrete to make room/capacity for the
batteries. Not too many of those available unfortunately, so we're left
with chopping lead (or iron...)
Hollow (filled fiberglass) keels on some boats?...hmmm.
Any marine architects on the list?
-Keith
--- In electricboats@
> I received two prices for converting, and without batteries, is getting
close to $12,000 US. Out of my ballpark, and no savings in the long run
at all.
>
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