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Quattro-II 2x120V
2. Description
2.1. 120/240V input and output, or 120V input and output (always 120V output
when in inverter mode)
The AC input can be supplied from a split-phase 120/240V source or a single-phase 120V source.
When an AC source is available, the Quattro-II will feed through the AC to its output. The output will therefore mirror the AC input.
The Quattro-II connects to the neutral and the preferred input line (L1). The power needed to charge the batteries will therefore be
drawn from L1.
The Quattro-II switches to inverter operation when no AC source is available. The inverter output is 120V single phase. In invert
mode, the Quattro-II connects both output lines (L1 and L2) together to provide 120VAC to loads on either line.
Any 240V loads will therefore be supplied only when the Quattro-II is supplied by a split-phase AC source. This prevents heavy
loads such as water heaters or 240V air conditioners from discharging the battery.
240V loads should be connected between L1 and L2 which could be either AC-out-1 or AC-out-2. There will be 240V between
them when the unit is connected to a split-phase input and 0V otherwise (single-phase grid or inverter mode). The voltage L1-N
and L2-N will be 120V regardless of single or split-phase input. This can be better understood when looking at the power flow
diagrams located in
Appendix G, Power flow diagrams
[35].
2.2. Boats, vehicles and other stand-alone applications
The basis of the Quattro-II is an extremely powerful sine inverter, battery charger and transfer switch in a compact casing.
Important features:
Two AC inputs; integrated switch-over system between shore voltage and generating set
The Quattro-II features two AC inputs (AC-in-1 and AC-in-2) for connecting two independent voltage sources. For example, two
generator sets, or a mains supply and a generator set. The Quattro-II automatically selects the input where voltage is present.
If voltage is present on both inputs, the Quattro-II selects the AC-in-1 input, to which normally the generating set is connected.
Automatic and uninterruptible switching
In the event of a supply failure or when the generating set is switched off, the Quattro-II will switch over to inverter operation
and take over the supply of the connected devices. This is done so quickly that the operation of computers and other electronic
devices is not disturbed (Uninterruptible Power Supply or UPS functionality). This makes the Quattro-II highly suitable as an
emergency power system in industrial and telecommunication applications.
Two AC outputs
Besides the usual uninterruptable output (AC-out-1), an auxiliary output (AC-out-2) is available that disconnects its load in the
event of battery operation. Example: an electric boiler that is allowed to operate only if the genset is running or shore power is
available. There are several applications for AC-out-2.
Please enter "AC-out-2" in the search box on our website and find the latest information about other applications.
Three phase capability
Up to 6 sets of three units can be parallel connected. Three units (or three sets of paralleled units) can be configured for
three-phase output, to provide 43kW / 54kVA inverter power and more than 1260A (24V) charging capacity.
PowerControl – maximum use of limited AC power
The Quattro-II can supply a huge charging current. This implies heavy loading of the AC mains or generator. Therefore a
maximum current can be set. The Quattro-II then takes other power users into account, and only uses 'surplus' current for
charging purposes.
- Input AC-in-1, to which usually a generating set is connected, can be set to a fixed maximum, so that the generating set is never
overloaded.
- Input AC-in-2 can also be set to a fixed maximum. In mobile applications (ships, vehicles), however, a variable setting by means
of a Multi Control Panel will usually be selected. In this way the maximum current can be adapted to the available shore current in
an extremely simple manner.
PowerAssist – Extended use of generator or shore current: the Quattro-II "co-supply" feature
This feature takes the principle of PowerControl to a further dimension allowing the Quattro-II to supplement the capacity of the
alternative source. Where peak power is often required only for a limited period, the Quattro-II will make sure that insufficient AC
mains or generator power is immediately compensated for by power from the battery. When the load reduces, the spare power is
used to recharge the battery.
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