Victron energy MultiPlus 12 3000 120-50 120V Service Manual page 6

The connector goes on first, then the flat washer, lock washer and nut. Tighten the nuts well for minimal contact resistance.
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2.3 Connection of the AC cabling
The MultiPlus is a safety class I product (supplied with a ground terminal for
safety purposes). Its AC input and/or output terminals and/or
grounding point on the outside of the product must be provided with
an uninterruptible grounding point for safety purposes.
The MultiPlus is provided with a ground relay (relay H, see appendix B) that
automatically connects the Neutral output to the chassis if no external
AC supply is available. If an external AC supply is provided, the ground
relay H will open before the input safety relay closes. This ensures the
correct operation of an earth leakage circuit breaker that is connected to
the output.
─ In a fixed installation, an uninterruptable grounding can be secured by
means of the grounding wire of the AC input. Otherwise the casing
must be grounded.
─ In a mobile installation (for example, with a shore current plug),
interrupting the shore connection will simultaneously disconnect the
grounding connection. In that case, the casing must be connected to
the chassis (of the vehicle) or to the hull or grounding plate (of the
boat).
In case of a boat, direct connection to the shore ground is not
recommended because of potential galvanic corrosion. The solution to this
is using an isolation transformer.
This unit or system is provided with fixed trip limits and shall not be
aggregated above 30 kw on a single point of common connection.
The terminal blocks can be found on the printed circuit board, see Appendix A. The shore or mains cable must be connected to the Multi
with the aid of a three-wire 90ºC (194ºF) copper cable. Minimum torque 5.1Nm.
Rated current
Recommend fuse or circuit breaker
Minimum wire gauge
AC-in (see appendix A)
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The AC input cable can be connected to the terminal block "AC–in".
From left to right: "PE" (earth), "N" (neutral) and "L" (phase).
The AC input must be protected by a fuse or magnetic circuit breaker rated at 50A or less, and cable cross-section must
be sized accordingly. If the input AC supply is rated at a lower value, the fuse or magnetic circuit breaker should be down sized
accordingly.
• AC-out-1 (see appendix A)
The AC output cable can be connected directly to the terminal block "AC-out".
From left to right: "PE" (earth), "N" (neutral) and "L" (phase). The Output Neutral is not bonded to ground.
With its PowerAssist feature the Multi can add up to 3kVA (that is 3000 / 120 = 25A) to the output during periods of peak power
requirement. Together with a maximum input current of 50A this means that the output can supply up to 50 + 25 = 75A.
An earth leakage circuit breaker and a fuse or circuit breaker rated to support the expected load must be included in
series with the output, and cable cross-section must be sized accordingly. The maximum rating of the fuse or circuit breaker
is 75A.
AC-out-2 (see appendix A)
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A second output is available that disconnects its load in the event of battery operation. On these terminals, equipment is connected
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AC-in AC-Out-1
50A 75A
50A 75A
AWG 6 AWG 6
AC-OUT-2
25A
32A
AWG 10