I only have a disconnect on the positive side of the bank, negative goes straight to the controller. I am one of those people that did use a Blueseas 9003E disconnect, rated for 48 volts max but 350 amps continous, 600 intermittent, 1200 for cranking 30 seconds. I know at 100% SOC my bank is just shy of 51 volts but the disconnect should never see 350 amps continous so I felt comfortable with that selection. Time will tell... Now looks like I might be "grounding" my EP system to the 12 volt house & AC buss.
One thing I've wondered about, does only breaking the positive on a propulsion bank create a parasitic load on the battery bank?
--------------------------------------------
On Sat, 3/3/18, James Lambden james@electroprop.com [electricboats] <electricboats@yahoogroups.com> wrote:
Subject: Re: Possible SpamRe: [Electric Boats] 48 volt system
To: electricboats@yahoogroups.com
Date: Saturday, March 3, 2018, 3:42 PM
Yes. in a floating system you
simultaneously disconnect both positive and negative for
every circuit. This is why troubleshooting is so easy.
Because each circuit can be completely isolated from the
system. In a floating system, both positive and
negative are considered to be live wires. In a grounded
system, only the positive is treated as a live wire because
the negative is held at ground potential.
Floating systems
have many advantages over grounded systems but they are more
expensive and require insulation resistance monitoring.
A lot of people
think that the system will float up in voltage away from
ground. The resistance monitor prevents this by
bleeding any static charge to ground, and provides a
"loose connection" to ground. What is more
worrisome is if any system gets 120 AC onto the battery pack
from a failed charger. A grounded system will not know
if this happens, whereas a floating system will give warning
so it can be fixed.
It
would be nice to float the 12 volt house battery too…..but
that is not a practical thing to do with the equipment on
today's boats. Alternators and starters are typically
grounded. And most boats have water cooled refrigerators,
VHF on the mast and other incidental ground points so it is
just not practical on the house system.
But a propulsion system is already
fairly isolated to the charger and the electric motor and is
easy to keep isolated.
If you do ground the propulsion
battery, and that shares the same ground as AC and the 12
volt house battery, then troubleshooting has just become a
really long and tedious process of disconnecting every
circuit until you find the one that is
compromised.
I would
rather know, by looking at my resistance monitor, that I
have a healthy propulsion battery with no faults. This
enables higher reliability and confidence in the most
important circuit aboard and electric boat - the propulsion
motor.
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 3, 2018, at
10:46 AM, bob jennings sabre281@yahoo.com
[electricboats] wrote:
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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