Good morning tom,
You are correct electric is the great for this application. There isn't much to break on an electric motor so I doubt you will have to Swap the motor out.
If the motor is using 30 amp to travel 4 knots. it would take you just under 4 hours to get halfway up the canal which would be 120 amp-hours (15 nm / 4 knot =3.75 hrs round to 4 hrs, 4hrs X 30 amps = 120 amp) This is the usable amp-hour you should have in your battery bank. 50% discharge (suggested lead acid discharge) you will want a 240 ah bank. 80% discharge (some AGM & lithium) ~150 ah
There are several options out there, torqeedo, & parson are two major MFR.
geoff gamsby
www.straightturn.net
--- In electricboats@yahoogroups.com, "incunabulaonline" <tomfindlay@...> wrote:
>
> Hello Electric Group,
>
> I'm building a Redwing 21 as a two berth charter boat exclusively for a small 30 mile canal situated here in Edinburgh Scotland. Hirers would charter for a two day, one way cruise including one overnight stop halfway along.
>
> The batteries could be charged if required, at a marina halfway along the 30 mile route.
>
> I dont want an inboard electric engine and would prefer outboard(s) for practical reasons if a breakdown occured. (easy to swop engines)
>
> What are my options, remembering it's only for a 30 mile journey with an overnight break halfway along. The speed limit on the canal is 4mph
>
> I think electric is an ideal solution in this instance, but what kind of outboard(s) and what kind of batteries and all the gubbins that goes with it, like an onboard charger that can simply be plugged in on the marina?
>
> Tom
> Edinburgh
>
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