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
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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Posted by: James Lambden <james@electroprop.com>
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