Great ideas.
However, my prioritized constraints are weight and size, followed by cost. So what are our options?
Weight of 48V 200ah battery bank?
Size and weight of 48V 100A diesel generator?
Total area of 48V 5A solar array?
Size and weight of 48V 20A wind generator?
Total cost of system including the traction drive system?
Will all of this fit on a boat that can be driven at 80% hull speed by an electric motor that draws less than less than 4.8KW continuous?
If so, what happens to the sailing performance of the boat? (just in case one wants to spend a little time with the motor off)
Compared to this solution; a Yanmar GM20 is lighter, smaller, more reliable, more powerful, cheaper and simpler. But it's not as cool without the silent running capability, as long as we don't count sailing.
Don't get me wrong, I really want to go electric. Check my intro post for info about my potential project.
Eric
--- In electricboats@
>
> Dave,
>
> Hear here! 48VDC, 100A marine diesel generator, 200(+) AH battery bank, 5(+) Amp solar charging, 5(+) Amp regeneration, 20(+) Amp wind generator, brushless (AC) or brushed (DC) motor sized for the boat to 80% hull speed continuous, all competitively priced and sized.
>
> Where can we buy such a system? It seems to me your humble opinion is right on target!
>
> Mark Stafford
>
>
> --- In electricboats@
> >
> > 4KW @ 48v = 100A (minues losses, etc). Looking at the torque curve for say
> > the Perm 132 @ 48v/100A = 20Nm with a rotational speed of 2203RPM. So, if
> > you had an ICE with the same output, how fast would your boat go given the
> > various weather conditions? That's the simple math. IMO, as long as the
> > electrical system matches the ICE system (or does better) you will have the
> > same performance with the benefits of using only electric (hopefully) a good
> > portion of the time - meaning total cost of ownership goes down.
> >
> > The challenge is the components. How do you get 48v from a generator into
> > the motor without going through the batteries, and if you did go through the
> > batteries, how do you prevent overcharging? Then, how do you get a 48v
> > battery bank to run it when not using the generator and how do you charge
> > the bank (AC, 48vDC, solar)? All the variables mean more components, which
> > drives the cost up and makes the system vulnerable to breaking down.
> >
> > IMO, the ideal system is a 48v bank ~400AHr, 48v DC generator, solar panel
> > or wind generator inputs and all the components that make it work integrated
> > into 1 box (possibly liquid cooled). When the bank gets past 50-80%
> > (depending on battery type), the generator kicks in and does the bulk
> > charging. The wiring is plug and play and it all fits in a space equal to a
> > normal ICE engine. I think the electric motor and components have come a
> > long way towards this goal in the past few years but literally no work has
> > been done on the generator side.
> >
> > DaveH
> >
> >
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