Imagine the range at about 600 watts(maybe about 3 knots or so?).
A question . . .
I don't know how to go about posting this question properly. That is if this is the right place, but here goes.
Why is it necessarily better to consider 12-48 volt motors DC, when the use of a 120 volt AC motor would allow all the 12 volt batteries to remain just that . . . 12 volts? The charging system would always be 12 volts and the addition of odd-number batteries would never be a concern(?).
A person could begin with the minimal available power and piecemeal additional power, sorta . . . on the fly, cause the deliverable power will always be 120 volts AC.
Is this a realistic way of considering electrifying?
John Francis
Port Clinton, Ohio
Pearson26 (hopefully, soon to be a Pearson 30 with a removed engine)
On Fri, Feb 19, 2010 at 11:58 AM, acsarfkram <acsarfkram@yahoo.com > wrote:
Eric,
I have about 200 amp hours worth of storage. 4 group 27 and 4 group 31. I motored from Still Water Cove near Carmel CA to Santa Cruz on an unusual calm day. At the time I had a smaller two blade prop, I think it was a 10"x8". I was motoring at 3 knots using 20 amps. I changed to a 12"x10" three blade and at 20 amps I get 4 knots of speed. After 7 hours of motoring I still had current to draw from in the first bank (did not use any of the second bank). One thing about my original charger is that it keeps the battery bank at 54+ volts. I had a problem with a battery going bad in the second bank and had to add a new battery to the mix. The charger, Kipoint 48 volt two lead charger had trouble with the new battery. I bought a Pro Charging Systems Four Bank Pro with separate leads for each battery and that took care of the balancing. The Four Bank Pro keeps the batteries at 51+ volts. I am curious what difference that will make in range.
Mark
--- In electricboats@yahoogroups. , "Eric" <ewdysar@...> wrote:com
>
> Mark,
>
> What batteries do you have in your boat? Your observation of 4 knots at 1000 watts is impressive, but if you can go 70 miles without recharging, you've got to have 17 hours of capacity on board. Even at only 20 amps, you would need 500Ah of 48v of AGM using a 70% depth of discharge.
>
> Your conversion sounds great.
>
> Fair winds,
> Eric
> Marina del Rey
>
> --- In electricboats@yahoogroups. , "acsarfkram" <acsarfkram@> wrote:com
> >
> > I have had a SolidNav Explorer in my 1976 Ericson 27 (27') for almost two years. I have not had any trouble with the motor. If SolidNav (probably Jason)is telling you they will deliver the motor I'm sure they will. I had very good service from the company when I bought the Explorer. I haven't spoken with Jason in a while so I do not know how the company is doing, but I would imagine they are like most in the boating industry and sales are slow. I wouldn't think twice about ordering another SolidNav product.
> >
> > The motor is plenty strong for the E27.
> >
> > For me there is no comparison between a diesel and electric. Just one issue is I do not like diesel odor while motoring or docked.
> >
> > The convenience of "right now" power is reassuring.
> >
> > It depends what you are going to use the boat for. Electric propulsion has a shorter range than diesel. With my setup I think I can get at least 70 miles motoring at 4 knots before needing a charge.
> >
> > If you go electric is Compac installing the motor in the boat?
> >
> > Mark
> >
> >
>
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