Hello Hanermo. I will plan on upgrading in due time. I wanted to figure out if my starting point would even work. Based on what I am seeing here, I am not too far off I think.
In an ideal world, I'll double the amount of PV's and setup with higher voltages. I have roughly 150 square feet of area on the deck of the boat. About a third should be reserved for a walk, hatches, etc. That gives 100 sq feet of space available. Based on my napkin calcs, that should give me 1.25KW of available power in full sun.
AC anyone? Just kidding!
Thanks for your comments.
Chris Curtis
---In electricboats@yahoogroups.com, <gcode.fi@...> wrote :
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.
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@... [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)
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