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On May 6, 2015, at 3:42 PM, scott_wmu@yahoo.com [electricboats] <electricboats@yahoogroups.com> wrote:
All,
I am a new member (sort of, I have been lurking around and reading). I am on the bubble whether to repower my 28' sailboat to electric this winter. I had a scare this spring with the old diesel and am tired of the poor old thing giving me an anxiety attack each time I turn the key not knowing if it will respond.
I am a bit of a "green soul" and mechanically I am more skilled at assembling electronics than changing oil. But I am also a bit on the cheap side and the old girl is still in service. But I am seriously tired of the oily smell from the bilge, the extra care when filling the tank, and ashamed when I see some sheen from the exhaust water (seldom, but still not a good thing). I am in the Chesapeake, and more specifically the Baltimore Harbor, so I am just adding to the problem of our murky bay.
I am more of a day sailor/weekender with a full-time job, and the boat is not comfortably ocean worthy, so I am not concerned with the cruising lifestyle issues. The typical docking distance under power is about 3/4 mile up a channel each way. But I wouldn't mind ensuring that I have a 10 mile range for emergency – or for motoring the 5 miles up into the Inner Harbor to listen to a band play. I have the typical 30 amp shore power and a 2 bank, 12V standard system aboard.
Boat specs are far below, but I would probably think that this chart is close for power consumption on a 5kW 48V system – which is adequate in my mind (we are sheltered from heavy seas and don't have much for tidal currents in the northern Chesapeake). This is from a post for Bob's 30' by Mike from Electric Yacht of Southern California:
Speed & PowerKts Amps Watts
2.5 10 4803.2 20 9604.0 40 19205.1 80 38405.8 120 57606.4 160 76806.9 190 9120Being cheap, and less concerned with racing sailing performance, I would probably go with the heavy AGM option banking four 100AH-ish (maybe a second bank if needing the range). The Lithium option is tempting, but unless someone has an awesome source (and I could package cells, I think I am capable) that I have not found, the doubling of cost is just too much. Assuming the math on AH is as simple as dividing by Amps, cruising speed of under 4 kts should fulfill my range needs with one bank.
So you are probably thinking at this point, "What is this guy even posting about? He seems to be doing the research." So what I wanted was someone to agree that all this jived, let me know if anything needed more attention, and maybe point me in the right direction for parts. Is there a local dealer in the Chesapeake area or is it all online orders? Is there a particular kit that everyone raves about. There seems to be a lot of piecemealling going on (maybe for price purposes). I will probably need to change my prop anyway. It is an old clunker - literally, it clunks, and vibrates like a washing machine when it refuses to clunk. Is the prop regeneration effective or even worth it?
I talked to my marine service shop and they could do the install and have done a few – but they don't do the design nor order parts, just installs. I would probably take it to them to gut the engine and peripherals – maybe they can salvage for parts a nearly a zero dollar net bill?
If anyone has any advice to throw my way, I would certainly be interested. Is there something I haven't considered? I am especially interested in the secret sources you have on where to get the goods. I don't want to cheap out and get garbage, but don't want to pay for someone's yacht mortgage.
Thanks,Scott P.
Sabre 28-2 1980LOA: 28' 5"
LWL: 22' 10"Disp: 7,900 lbs.Max hull speed: ~7 ktsCurrent Powerplant:Original Volvo 13hp Diesel
Max speed: 4-5 ktsOffset shaft outputBob,
I made a speed power table for your boat with a conservative assumption for a 48v system.2 blade folding prop (specs unknown) in front of the rudder
20 gal. fuel tank
Posted by: Terry Hall <thall90024@yahoo.com>
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