I apologize for a bit of thread drift here, but the comment made earlier about the max voltage rating for Blues Seas battery switches vs BEP Marine switches caught my attention, since I am using a Blue Seas switch in my boat.
I sent BEP an e-mail asking whether the 48V rating of their switches was nominal or maximum. Their response is that their product is rated at 48V max.
Maybe the BEP switch mentioned earlier is a custom switch? If so, I'd like to know more about it.
Here's the e-mail exchange:
HI Tom
Sorry they will not be suitable for your application as they are rated to a maximum 48volts
Regards
Mike
Michael Conway
Sales Representatve
BEP Marine
DDI: +64 9 414 1369
Phone: +64 9 415 7261 ext 724
Fax: +64 7 415 9327
Email: mconway@bepmarine.com
55 Paul Mathews Rd
Albany 1311
Auckland
New Zealand
Web address: www.bepmarine.com
Important Notice: BEP Marine will be closed for our annual stock count from 8am on Friday 29th July 2011 until 8am on Monday 1st August 2011.
-----Original Message-----
From: BEP Marine [mailto:jjavier@bepmarine.com]
Sent: Saturday, 23 July 2011 8:55 a.m.
To: AMGLN.BEP-Enquiries
Subject: Contact Us form submitted from website - BEP Marine Limited - The Marine Electrical and Electronic Specialists - BEP Marine
Below is the result of your Contact Us form
----------------------------------------------------------
NAME: Tom Regan
MESSAGE: I see your battery switches are rated at 48V. Is this a nominal value? My electric launch has a nominal 48V battery bank that charges at 55-56V.
Thanks!
--- In electricboats@yahoogroups.com, James Lambden <james@...> wrote:
>
> Hi Mark,
>
> The Blue Seas 48 volt switch is rated at 48 volts maximum not 48 volts nominal - which includes charging voltages up to 58 volts.
>
> We use the BEP switches that are rated at 48 volts nominal.
>
> I have had one string of four 4D batteries in parallel with one string of four 8D batteries on Kapowai for 5 years without any issues.
>
> The advantages of operating as one big parallel bank are there is less effect from Peukert's exponent, so the batteries actually act like they are more than twice as large, because each 48 volt battery sees only half the current under operation.
>
> The disadvantage is that one bad cell in one battery will bring down the voltage in the other string of batteries - so its important to monitor the individual battery voltages.
>
> I keep all 8 of my batteries together all of the time to avoid the issue of combining a full battery with a depleted one.
>
> James
>
>
> http://www.propulsionmarine.com
> Propulsion Marine Products by
>
> Above the Waterline, Ltd.
>
>
>
> On Jul 22, 2011, at 8:50 AM, acsarfkram wrote:
>
> > Hi Mike,
> >
> > I thought about using a 1-2-both switch but was not comfortable with the close proximity of the terminals on the switch and the 32 volt max voltage rating (Blue Sea). The single on/off Blue Sea switch that I used is rated at 48 volts. I spoke with someone at Blue Sea and they said that there was enough margin in the rating for my use.
> >
> > Thanks,
> >
> > Mark
> > Santa Cruz
> >
> > --- In electricboats@yahoogroups.com, "Capt. Mike" <biankablog@> wrote:
> > >
> > > Many boats have a 1, 2, or both battery
> > > switch for there 12 volt systems. On mine switch 1 was for the starter battery and two was for the house 12 volts (two group 27 gel batteries in parallel ). When I converted to electric I was able eliminate the starter battery and now have each house battery on it's own switch but, I operate in the Both position BTW. It should work the same with two 48 volt banks. Just make sure your wiring and switch can handle the increased current. Also as someone else mentioned if the batteries are not equally charged the higher charged one will drain into the weaker until they are equal.
> > >
> > > Capt. Mike
> > > Sent from on board BIANKA
> > > http://biankablog.blogspot.com
> > >
> > > -----Original Message-----
> > > From: Dennis Wolfe <dwolfe@>
> > > Sender: electricboats@yahoogroups.com
> > > Date: Fri, 22 Jul 2011 08:48:15
> > > To: <electricboats@yahoogroups.com>
> > > Reply-to: electricboats@: Re: [Electric Boats] two banks
> > >
> > > On 7/22/2011 1:29 AM, acsarfkram wrote:
> > > >
> > > > My EP system has two separate 48 volt, 100ah battery banks with a
> > > > common negative. If I switched both on at the same time would I get
> > > > one bank at 200ah? There is a diagram here;
> > > > http://groups.yahoo.com/group/electricboats/photos/album/237790029/pic/72846009/view?picmode=large&mode=tn&order=ordinal&start=1&dir=asc
> > > > <http://groups.yahoo.com/group/electricboats/photos/album/237790029/pic/72846009/view?picmode=large&mode=tn&order=ordinal&start=1&dir=asc>
> > > >
> > > > I've always figured I would fry something if I turned both on but
> > > > someone mentioned that it would just act as one 48 volt bank with both
> > > > switches on.
> > > >
> > > > Thanks,
> > > >
> > > > Mark
> > > > Santa Cruz
> > > >
> > > >
> > > yes
> > >
> >
> >
>
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