Richard all reasonable except you haven’t mentioned the motor model, its rpm/v or the prop. Apart from the voltage and mass these are the factors which will determine the load on the motor , therefore current draw and reasonableness of the setup
Yours,
Andrew Gilchrist
fastelectrics.com
Australia
0419 429 201
From: electricboats@yahoogroups.com [mailto:electricboats@yahoogroups.com] On Behalf Of RICHARD JAMES
Sent: Thursday, 18 April 2013 7:44 PM
To: electricboats@yahoogroups.com
Subject: Re: [Electric Boats] Re: Proper battery capacity
Hi all, I've been reading these posts to glean some info for my own project (more later) but I'm a bit confused over the units being talked about. seeing a lot of 1Wh/lb suggested and then 1kWh per ton as if they were the same. Surely 1Wh/lb is equivalent to 2kW/ton, there being 2000lbs in a ton (in the U.S.) or am I missing something.
Anyway my project is probably an order of magnitude smaller than what you people are doing (apart from the guy with the canoe) but here goes. I'm planning a day boat for some genteel cruising on the upper reaches of the Thames (ie non-tidal). About six hours cruising a day at three to four knots. The hull form is pretty close to that of an inflatable, flat bottomed, rounded sides. All-up weight of boat, four people, batteries, motor etc approx 1500lbs. 350W 48v motor powered by four 110Ahr batteries in series. The question I have is this - does this all sound reasonable or is it way out. I would very much appreciate some advice.
Richard James
London, UK
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