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4.3. Connection of the AC cabling
This product 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.
This product 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 30kW on a single point
of common connection.
The AC terminal blocks can be found on the printed circuit board, see Appendix A.
Do not invert neutral and phase when connecting the AC.
The AC connections need to be made with three-wire 90ºC (194ºF) copper cable.
12/3000/120-50 & 24/3000/70-50
Rated current
Recommend fuse or circuit breaker
Minimum wire gauge
Ferrule pin length / stripping length
The inverter does incorporate a mains frequency isolating transformer. This precludes the possibility of DC current at any AC port.
Therefore type A RCDs can be used.
• AC-in-1
One AC input cable can be connected to the terminal block 'AC-in-1'. If AC voltage is present on these terminals, the Quattro-II
will use this connection. Generally a generator will be connected to AC-in-1.
From left to right: "L2" (phase 2), "N" (neutral), "PE" (earth) and "L" (phase).
The AC-in-1 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-in-2
A second AC input cable can be connected to the terminal block 'AC-in-2'. If AC voltage is present on these terminals, the
Quattro-II will use this connection, unless voltage is also present on AC-in-1. The Quattro will then automatically select AC-in-1.
Generally the mains supply or shore voltage will be connected to AC-in-2.
From left to right: "L2" (phase 2), "N" (neutral), "PE" (earth) and "L" (phase).
The AC-in-2 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.
Note: The Quattro-II may not start when AC is present only on AC-in-2, and DC battery voltage is 10% or more below
nominal (less than 22 Volt in case of a 24 Volt battery).
Solution: connect AC power to AC-in-1, or recharge the battery.
• AC-out-1
The AC output cable can be connected directly to the terminal block 'AC-out'.
From left to right: "L2" (phase 2), "N" (neutral), "PE" (earth) and "L" (phase).
With its PowerAssist feature the Quattro-II can add up to 3 kVA (that is 3000 / 120 = 25 A) to the output during periods of peak
power requirement. Together with a maximum input current of 50 A this means that the output can supply up to 50 + 25 = 75 A.
Page 13
Quattro-II 2x120V
AC-in 1
AC-in 2
50 A
50 A
50 A
50 A
AWG 6
AWG 6
0.7 inch (18 mm)
0.7 inch (18 mm)
AC-Out-1
AC-Out-2
75 A
50 A
75 A
50 A
AWG 6
AWG 6
0.7 inch (18 mm)
0.7 inch (18 mm)
Installation
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