Re: [Electric Boats] Desiderata

Kirk, would you like to show photographs of 150,000 internal
combustion motor vehicle fires which occurred within last year in the
US? Eric provided a concise summary of the advantages of LiFePO4, so
cool it with the media-driven anecdotes, all the result of serious
accidents which physically penetrated the Tesla (non-LiFePO4) battery
packs, and the fires were non-explosive. Having witnessed the results
of a flooded-lead-acid battery hydrogen explosion, give me LiFePO4
anyday!

Stuart, you need to qualify your "2 hours from the battery" - for
example, is that wide-open throttle into a 30-knot headwind?

Perhaps expecting six hours at five knots in zero wind would be a
reasonable requirement in your case? As so many owners of EVs have
found out, your range is whatever you want it to be - just adjust your
speed accordingly.

Is it possible to integrate some serious solar panels onto your boat,
as that will help minimize the use of a genset, at least for your
house bank? If you spend a few days of inactivity, solar could
replenish you main traction bank as well.

Perhaps a discussion of traction pack size vs house battery size might
be in order, as well as the ability to transfer energy in either
direction.

As a liveaboard, you will quickly appreciate the silence and fresh air
and cleanliness and no vibration with the absence of your main diesel.
Properly-sized, you might also rarely use your genset (which you will
most probably want for emergency backup, anyway). Are you tied to a
dock with shorepower or would you rely on solar while swinging on a
hook at homebase? Are your charters day charters or do you go out for
a few days? Ever have the need to motor back to base for an extended
period of time (like, 24 hours)? Sizing the battery pack(s)
accordingly will be an interesting exercise.

Lots of variables, and have fun exploring them.

JoeS.


On Aug 6, 2014, at 1:04, Stuart Armstrong sydesiderata@yahoo.com
[electricboats] wrote:

>
>
> Hi All
> Thanks for the feedback.
> Here is a bit more info hope this helps
>
> I would be looking to get about 2 hours from battery as mostly I am
> sailing,
> the battery's must recharge as I sail
> I obviously need a generator to recharge when not sailing or no wind
> And for domestic power
> The alternative is buying both a Diesel engine and a generator
> Why would a commercial outfit be different , we live on Desi 24/7
> I don't believe weight will be an issue as Desi weighs 30 tonnes and
> at the moment we carry 1000 ltrs in two tanks one of which I would
> convert to battery space
>
> Stuart Armstrong
>
>>>
>>
>
>
>



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