Excellent post.
I understand You very well - but -
Please upgrade Your budget.
400W nominal PV is not 400W motive power.
As the craft is long, slim, light it can plane and will be very efficient.
Yet, about 100-200W at prop avg is not enough.
Most of the time the PV will deliver 60-80%, so 80% x 400 =320.
Cabling eats 20% at low voltage.
260W.
Motor eats 20%-
== 200W.
At best.
3 panels of 330W each, per motor, is what you want.
Not due to peak power, but due to morning, evening, shaded power.
On 17/01/2017 17:04, yahoomail@curtisteam.org [electricboats] wrote:
>
> Hello to the group. My name is Chris Curtis. I'm building an
> obscure type of sailing muiltihull called a proa as a technology
> demonstration project. Due to my Proas hull design there is a
> massive amount of available real estate to mount PV's. Further the
> Proa has protuberances that will allow for drop down trolling motors
> on sleds. This allows for electric power, steering and "spin" type of
> operations.
>
> My current entry level plan is primarily dictated by my budget (2K).
> I'll have each motor system have its own PV's (400w each), MPPT
> controller, and two T105's (220AH). The motors will be standard
> saltwater 35lb thrust type. Based on my painfully (likely wrong)
> rough calculations, in full sun I should get over 90 percent of
> current into the batteries (30A) that the motor is pulling (about
> 35A). What I'm looking for is the ability to run in full sun with
> very little battery assist. On a sunny day I'd like to be able to
> take off in the ICW (or Abaco Sea) and go until the evening all on
> electrics without worrying about completely depleting the batteries.
> If the project is successful, I'd like to add just a bit more and be
> able to run at full speed and still have enough power to charge the
> batteries. For some perspective, the Proa is 30 feet long, has a 18
> inch draft, all told is 20 feet wide and weigh's 3500LBS fully loaded
> in cruising mode. The main hull is 32 inches wide at the waterline, 8
> feet at the deck. The small hull or outrigger is like a very large
> kayak. His (Proas are He's!) planned areas of use are the PNW and the
> Florida/Bahamas areas of the SE. He is trailer-able at just over 2000lbs.
>
> I created a folder called VolksProa Dual Electric Proa (or something
> like that). If interested please take a look as its a hard boat to
> understand without a picture. Please feel free to comment on my idea
> and plan. I'm not expecting the world and I do have some experience
> living under PV (on a boat). I'd prefer to go with a single system,
> higher voltage, better motors, etc but it does not fit with the design
> brief. It must be a fairly low dollar affair. Thanks for any time
> you give this.
>
>
> Chris Curtis
>
--
-hanermo (cnc designs)
Posted by: Hannu Venermo <gcode.fi@gmail.com>
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