[PSUBS-MAILIST] Elco Motors

Tue Apr 22 18:07:17 EDT 2014

The same problems as the Lion cells?

You can’t get away without a good BMS.

Thanks,

Ken

From: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org] On Behalf Of Christopher Graca via Personal_Submersibles
Sent: Tuesday, April 22, 2014 4:32 PM
To: Personal Submersibles General Discussion
Subject: Re: [PSUBS-MAILIST] Elco Motors

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] 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 <http://overview.mail.yahoo.com?.src=iOS> 

Sent from Yahoo Mail for iPad

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