You project is very similar to my own. So I am very interested. Please keep me posted of your results. I'll be curious how fast you can push your boat with 2 2.5 hp motors. I thought about using an inverter to push 3 phase motors, but the inverter cost for the size motors I wanted was prohibitive.
Hi Ben,
Nice to have You here at the electric side of boating! I am not yet
totally finished with my houseboat project (in water mid of august) but
some of the ideas I have put in that boat so far:
13,5 m length, trimaran style, steel hulls. 7 ton. In center hull 1 fork
lift traction battery 775 Ah, 48V (new - half price from shut down
factory), 12 pcs 210W solarpanels, Morningstar solar charger 48 V, + 2 pcs
210W panels charging 160Ah, 24V gel batteries (ledlights, and other
electronics, one 4kW inverter (swiss made Studer)48V to 230V AC (and up to
10 kW in short periods) feeding 2 standard 3- fase industrial 2,2 kW
engines (one in each outer hull) reduction 2-1 via cogged belts. Engine
controller = standard idustrial VFD. Industrial = better prices. High
voltage = lower losses and smaller cables. Done some initial tests. Sofar
so god. Will keep the list updated if there is interest. Of course there
is different needs between a houseboat (3-5 knots) in sheltered waters and
a offshore cruiser, but some basic ideas should be valid in both
situations.
Rgds/Leif Thomsen, Sweden
> Hi, everyone -
>
> New to this forum, good to be here. I've been avidly reading dozens and
> dozens of the previous posts; seems like the right place for me to be,
> given my situation. Just as a quick intro, I'm a live-aboard sailor
> (have been at it for some 20 years now), and have a good bit of
> experience with boat issues of all sorts; I also have the (dubious)
> advantage of a BSEE in my dim, dark past, as well as having worked as an
> electronics tech for a number of years.
>
> I've just become the proud owner of a Morgan Nelson-Marek 45', which was
> previously used as a pure racer (despite her lovely cruising interior),
> which obviously spent all her non-racing time tied to a dock, shore
> power and all, with all that that implies (incandescent lighting,
> rudimentary charging system, neglected engine, a single battery as the
> house bank, etc.) Obviously, my first challenge is to "stop the
> bleeding" - replace all the incandescent fixtures with fluorescent
> and/or LED (any advice in that direction would also be appreciated) and
> to install something resembling a reasonable house bank. That last part,
> however, is tempered by my desire to make this system "upgradeable",
> because I'd really love to get rid of the stinky, oily beast of a
> Perkins in her guts and replace it with an electric drive. I've already
> contacted the folks at electricyacht.com and had them send me an
> estimate of what it would take to convert her; they recommended their
> 360ibl motor with a 72V/400AH bank, which to my mind seems a bit small
> for a 22,500lb displacement/36'9" LWL boat (again, I'm happy to be
> corrected on this score.) I'm at a bit of a loss for a different unit,
> though; haven't seen much that really appeals. I also suspect that I'm
> going to need quite a bit more in a way of power storage, too - although
> I prefer to sail whenever I can.
>
> Since I run my business (computer consulting) from my boat, my peak
> power usage tends to run about 150AH/day (that's about 5-10% of the
> time.) Another 10-15% of the time, it's closer to 100AH/day, and the
> rest of the time, it's more like 50AH/day. On my previous boat, my house
> system consisted of 6 T-125s with a 250W PV system and an Air-X wind
> generator feeding it, as well as a Honda EU2000i and a 120A alternator
> on my diesel engine. The system I'm planning is going to be radically
> different: for one thing, I have a very long cockpit - about 10' - and
> I'm looking at replacing the bimini that's now in place with a set of
> Kyocera 135W panels, as many as I can squeeze in. I'd prefer not to have
> a wind generator this time, but will put up with one if I have to. Also,
> I rarely spend any time at a dock, and strongly prefer anchoring out; in
> fact, that's how the boat is going to spend most of her time.
>
> I realize that this is a lot of stuff (once I start writing about things
> like this, it's hard to stop!), but, again, any useful advice on any of
> the above would be greatly appreciated.
>
>
> Fair winds to all -
> Ben
> --
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