As much as I would agree with a small outboard being a great option for a "get home" backup, You have to remember that "Outboards NEED to be run Constantly" if you expect them to work when you need them.
So this is kinda' a catch 22.
One of the WONDERFUL features of an electric motor is that you can be MUCH more confident that you can pull an electric motor out of storage, throw the switch, and it'll most likely run.
With a gas engine, if you let it sit up for a year or two, and then one day have an event where you need it - good luck!
But in terms of a lighter, cheaper backup solution, the outboard is a much better option. You just have to make sure you start and run it every two weeks or so, and keep up with the plugs, impeller, etc. so that it will start right up when you need it. <sigh>
John
From: "sv8827 sv8827@yahoo.com [electricboats]" <electricboats@yahoogroups.com>
To: electricboats@yahoogroups.com
Sent: Thursday, November 9, 2017 9:32 AM
Subject: Re: [Electric Boats] Re: Battery Banks (What is the better battery)
If we start with 1kW per square meter of solar energy at sea level and 20% efficient panels, 3kW is going to require 15 square meters of panels. Your trailerable catamaran needs to have a 6ft beam and 27ft length on deck.
At this point the advice you are looking for is how to do a "get home power". I would buy a 2HP 4 stroke outboard motor that would be used only in an emergency. At 40lbs it will add less weight than a battery thus minimal impact on performance during normal solar powered operation. Your vessel will have redundant propulsion capability and absolutely no single point failures to set you back. If in three years the panels become significantly more efficient than 20% you could cut down on the length of your boat. If in three years a breakthrough battery achieves significantly more energy density compared to today's 100 Wh/kg with Lithium Iron batteries you can ditch the plans for the outboard and get batteries.
In the mean time just keep the outboard in a box and never brag about its performance in this group :-)
Cheers and good luck with your project Nick.
Ahmet
From: "63urban 63urban@gmail.com [electricboats]" <electricboats@yahoogroups.com>
To: electricboats@yahoogroups.com
Sent: Wednesday, November 8, 2017 5:45 AM
Subject: Re: [Electric Boats] Re: Battery Banks
I am just in the planning stage at this point but a light cat build with somewhere between 2400 watts and 3000 watts seems doable with the quality of solar coming on stream now and in the next year or three.
My usage will primarily be cruising inland waters canals etc so lots of continuous no wake zones.
The draw from one or even if I wind up with two ray marine outboards or another brand( I haven't made final decision it will be a matter of what's available at the right price at the time) at the low cruising speeds will often be less than the solar output or just under.
So my thinking is a bit different than many on here. I think my battery bank will spend most of its life topped up.
What is the better battery for these conditions?
Thanks
Nick
Sent from my Bell Samsung device over Canada's largest network.
-------- Original message --------
From: "'P. Jeremy Baker' childscrick@yahoo.com [electricboats]" <electricboats@yahoogroups.com>
Date: 2017-11-07 12:38 PM (GMT-05:00)
To: electricboats@yahoogroups.com
Subject: Re: [Electric Boats] Re: Battery Banks
Amps or volts? I think you are referring to amps? Or current.
The voltage from the panels needs to be higher than the battery to push a charge into the battery.
If you have that much current from your solar and it matches you motor I suspect your motor may be a little small for the load? What are you trying to do.
Jeremy
If you have that much current from your solar and it matches you motor I suspect your motor may be a little small for the load? What are you trying to do.
Jeremy
On Nov 7, 2017, at 8:03 AM, 63urban 63urban@gmail.com [electricboats] <electricboats@yahoogroups.com> wrote:
What if you have a large solar panel bank the produces close to or in excess of your motor draw? What type battery bank is recomend ed?ThanksNick bSent from my Bell Samsung device over Canada's largest network.
-------- Original message --------
From: "cpcanoesailor@yahoo.ca [electricboats]" <electricboats@yahoogroups.com>
Date: 2017-11-07 10:39 AM (GMT-05:00)
To: electricboats@yahoogroups.com
Subject: [Electric Boats] Re: Battery Banks
I think it depends somewhat on the size of your motor compared to the AH capacity of your batteries. If you use 3 switchable banks, the Peukert losses will be greater, but you'll have fewer problems with balancing. You'll also have a system with built-in reserve.
If you have a large motor and small capacity batteries, Peukert losses are significant, so the parallel configuration will give much better performance than three switchable pairs.
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