I suspect You will not get a good result.
The boat is a planing design, and generally speaking they are all very
inefficient.
Thus, they use a lot of power to move, since power from ICE is very
cheap, most especially in the USA.
So, your boat might use say 50-70 hp to get on plane, and then 30 hp to
stay there.
Delivering 30 hp for any length of time, is not practical on any small
power boats.
An electric motor would, with the right prop, perhaps be able to keep
her on plane for maybe 20 hp.
This is still a lot.
Lets say 20 hp, approx 15 kW, for 15 kWh total energy used in one hour,
and 30 kWh there and back, and 40 kWh with a 30% reserve.
This would need a lion battery pack of 44 kWh nominal.
If you can re-purpose a good lion battery pack from a Tesla car or a GM
bolt (probably not available, yet), you might get them for == 200$ / kWh.
=> 8800$ in batteries, approx 250 kg mass.
So you would be fine on mass, even near-double would be ok mass-wise.
At say 1500 $ each BOS costs including VFDs and cabling at 200$ per,
==> 3000$ system cost + batteries.
==> 11.000 $ total.
This might be cheap, very cheap, or very expensive.
Ie compared to new ICE engines/transmission, it is very cheap.
Compared to (apples to oranges) a tiny 3-10 kW brushless motor + cheap
controller for a small sailboat and only 5 kW batteries, it is very
expensive.
The base problem:
Going slow wont work for your boat, unless it is 3-4 knots, which is
probably not suitable.
Going slow on a deep-hulled planing boat means you use near the same
power at 1/3 the speed, and the motion is usually not comfortable.
My tlar gues is perhaps 15 knots ? planing minimum.
For == 15 miles total range.
Online sources said 16-18 knots, so it seems in "tlar".
Everything changes if You can/will invest serious money in it, and go
for 100-200 kW of power.
This might cost 20-30 k$, total.
Calcs:
Fuel in boat, now, 851 l == 750 kg, with tanks, valves, pumps, plumbing.
Engines == 300 kg each with transmissions, x2 == 600 kg total.
So, you probably have about 1350 kg in driveline mass now.
All numbers ballpark, from tlar method.
The electric engines == 30-60 kg in mass, electronics minimum, say 120
kg total system mass.
So you might have == 1200 kg for batteries, and saving 550 kg might
reduce fuel aka power consumtion 5-10% or so.
The EV motors might cost 300-2000 $ each, with controllers.
Huge variety, depending on lots of things like efficiency, how
industrial they are (aka great for marine use), controller type/cost etc.
Technically, you can buy any size/power VFD + 3-phase motor very very cheap.
A used surplus industrial motor would be dirt cheap, very efficient,
totally reliable.
Industrial stuff lasts 20-50 years, even in 24x7 use.
The VFDs are cheap, these days.
Even chinese ones are good, many of them. So are some chinese brushless
controllers, according to lots of data.
On 21/04/2017 14:46, cliff_sadler@yahoo.com [electricboats] wrote:
>
> Been lurking here for a week or so.
>
>
> I haven't found much in the way of larger conversions unless they are
> sailboats. Please point me in the direction of cruiser type conversions.
>
> I have a late 90's 370 Sundancer that has twin 454 Magnum MPI
> engines. They are tired, and one is seriously broken, and I am ready
> to explore the world of e power. I am not a long range cruiser. We
> mainly do day trips from beach to cove around Sarasota Bay. We NEVER
> go fast. Don't need to with the boating pattern we enjoy.
>
> I think this vessel might be a perfect platform for going hybrid. I
> still want my genset to run house amenities, and charge batteries
> between legs. I am not a "go green" guy, but rather trying to free
> myself from the expense and maintenance of ICE.
>
> Care to share who your consultant is? May consider a partnership with
> a company that wants to showcase their technology in re-powering with
> electric.
--
-hanermo (cnc designs)
Posted by: "Dan Hennis" <dhennis@centurytel.net>
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