Magnum Energy Mini Magnum Panel (MMP Series) - Manual (Page 68)

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2013 Magnum Energy, Inc.
Appendix B - Using the MMP in a Mobile Application
Appendix B – Using the MMP in a Mobile Application
The MMP Series is designed and approved for use in residential or commercial applications. It has
been tested and listed to UL 1741, 2nd Edition (inverters, converters and controllers for use in
Independent Power Systems) for use in the US; and is also certified to CSA C22.2 No. 107.1-01
(General Use Power Supplies) for use in Canada. The AC input and output neutral connections
in the MMP are combined and are bonded to the internal ground bar. The bond from neutral to
ground can be removed as neutral is bonded to ground from the primary AC source.
In a mobile application, the standards for safely wiring RV, truck, and marine installations in the
United States requires the neutral and safety ground to be connected at the AC source; whether
it is a shorepower feed, an inverter, or a generator. This maximizes the possibility that a circuit
breaker will activate if a hotwire-to-ground fault occurs. These standards also require that the
AC neutral be connected to safety ground (often called a “bond”) in one, and only one, place at
any time. The single bond is established in order to make the electrical panel’s neutral line safe,
by connecting it to ground. Without this bond, the neutral can have up to 60 VAC with respect to
ground.
Because the neutrals are combined, if the MMP is used in a mobile application, more than one
neutral to ground bond may be established, which can cause current to circulate between the
multiple neutral to ground connections. This can cause “ground-loop” currents, which can trip
GFCI’s, cause an electrical shock hazard, and may be the reason for other annoying side effects.