[PSUBS-MAILIST] Elco Motors

[Christopher Graca via Personal_Submersibles]

Sorry, was directing the question to Hugh


On Tue, Apr 22, 2014 at 3:31 PM, Christopher Graca <cgraca2 at gmail.com>wrote:

> Ken,
>
> do the LiFePO4's have the same problems if they are stored at a lower
> voltage, and then just recharged while re-balancing the individual cell
> voltages prior to use?
>
> -Chris
>
>
>
> On Tue, Apr 22, 2014 at 3:23 PM, Hugh Fulton via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>> Ken,  I have had a lot of expense with LiFePO4’s.  Battery management
>> system BMS is critical and they do not like sitting unused.  OK on a daily
>> use vehicle but as they are made in China the individual cell quality is
>> dubious and they need to be matched.  It has cost me a lot and I am not in
>> the water.  Chs  Hugh
>>
>>
>>
>>
>>
>>
>>
>> *From:* Personal_Submersibles [mailto:
>> personal_submersibles-bounces at psubs.org] *On Behalf Of *Ken Martindale
>> via Personal_Submersibles
>> *Sent:* Wednesday, 23 April 2014 1:51 a.m.
>> *To:* 'Personal Submersibles General Discussion'
>>
>> *Subject:* Re: [PSUBS-MAILIST] Elco Motors
>>
>>
>>
>> Be nice to use the LiFePo4 batteries for the Sub batteries.
>>
>>
>>
>> Ken Martindale
>>
>>
>>
>> *From:* Personal_Submersibles [
>> mailto:personal_submersibles-bounces at psubs.org<personal_submersibles-bounces at psubs.org>]
>> *On Behalf Of *via Personal_Submersibles
>> *Sent:* Tuesday, April 22, 2014 8:44 AM
>> *To:* personal_submersibles at psubs.org
>> *Subject:* Re: [PSUBS-MAILIST] Elco Motors
>>
>>
>>
>> Joe,
>>
>>
>>
>> A good idea. Paul M. reckons the dsl/elec hybrid makes for the best psub
>> for the obvious reasons, and so did Captain K. Autonomy is good. If it's
>> 7-8K for the entire system, I would suggest that it ain't bad, considering.
>> Then maybe add a variation on Hank's shaftless coupling, perhaps?
>>
>>
>>
>> Vance
>>
>> -----Original Message-----
>> From: Joe Perkel via Personal_Submersibles <
>> personal_submersibles at psubs.org>
>> To: personal_submersibles <personal_submersibles at psubs.org>
>> Sent: Tue, Apr 22, 2014 7:46 am
>> Subject: [PSUBS-MAILIST] Elco Motors
>>
>> Very interesting and informative data on Elco's marine website pertaining
>> to sizing, rates of discharge, range, and hybrid matching
>> http://www.elcomotoryachts.com/ep-600.shtml
>>
>> I don't think its possible to scratch build the reliability of these
>> particular types of products in the electric boat industry, these are fully
>> engineered systems. At 7-8k, its an expensive motor and would have to be
>> inside with a rotating shaft seal arrangement, but coming from an
>> experimental aircraft perspective the price points on these motors is a
>> comparative bargain. I'm looking at these from a long distance surface
>> transit standpoint for the Seehund.
>>
>> Joe
>>
>> Sent from Yahoo Mail for iPad <http://overview.mail.yahoo.com?.src=iOS>
>>
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