James, when you refer to double pole breakers on a 48 volt floating system, are you breaking both positive & negative from the battery bank?
--------------------------------------------
On Sat, 3/3/18, James Lambden james@electroprop.com [electricboats] <electricboats@yahoogroups.com> wrote:
Subject: Re: [Electric Boats] 48 volt system
To: electricboats@yahoogroups.com
Date: Saturday, March 3, 2018, 1:01 PM
Either way is acceptable. Grounded
systems are simpler and require single pole breakers.
Floating systems have complete on the fly diagnostics.
Floating systems
require double pole breakers and a ground fault monitor with
alarm.. You can build to E-11 or E-30 but follow all the
recommendations.
Be careful with your solar… to
build a solar array that charges at 48 volts, you need at
least 70 Volts Maximum Power from the panels if you are
using an MPPT charge controller. You will want to have
a ground fault breaker put on the solar array as that
voltage is higher than 48 nominal.
In either scenario, every conductive
metal component that is likely to be energized needs to be
tied into the bonding / grounding system.
Make sure that both
48 volt banks can be switched out and the switch is rated
for 48 nominal and not 48 maximum like all the basic marine
switches are. A switch that can switch under load
should be specified.
James
Lambden
The Electric Propeller Company
625C East Haley Street,
Santa
Barbara, CA
93103
805 455 8444
james@electroprop.com
www.electroprop.com
On Mar 2, 2018, at 3:00
PM, brucenoble@bellsouth.net
[electricboats] wrote:
OK
my head is spinning from all these electric ground post.
some say ground some say no ground. im getting
dizzy I am building a small solar boat with a 48
volt motor ,with two banks of 48 volt batteries and
three 270 watt solar panels and NO hook up for
shore power.....ok chime in please ground or no ground
to earth....Bruce
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