[PSUBS-MAILIST] Elco Motors

[Christopher Graca via Personal_Submersibles]

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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