Specifications

2
2. DESCRIPTION
2.1 In general
Two AC inputs with integrated transfer switch
The Quattro can be connected to two independent AC sources, for example shore-side (grid-) power and a generator, or two
generators. The Quattro will automatically connect to the active source.
Figure 1: Block diagram
Accepts several input voltages (See fig 1)
Each AC input can be supplied from:
- A 120/240V split phase source. Phase angle between the two 120V legs: 180 degrees. Maximum input current: 60A
per leg.
- A 120/208V two leg three phase source. Phase angle between the two 120V legs: 120 degrees. Maximum input
current: 60A per leg.
- Two in-phase 120V legs with common neutral. In this case the phase angle between the two 120V legs is 0 degrees.
Maximum input current: 60A total (otherwise the neutral input would be overloaded).
- A 120V single phase source. Maximum input current: 60A.
The AC inputs can be connected to a different type of supply: one input may for example be connected to a split phase source,
and the other to a single phase source.
When an AC source is available, the Quattro will feed through the AC to its output. The output will therefore be equal to the AC
input.
When AC is available on both inputs, the Quattro will connect to AC-in-1.
The inverter/charger connects to the neutral and the preferred input leg (L1-1 of input 1 or L1-2 of input 2). Power needed to
charge the batteries will therefore be drawn from L1-1 or L1-2.
The Quattro switches to inverter operation when no AC source is available. The inverter output is 120V single phase. In Invert
mode, the Quattro connects both output legs (L1 and L2) together (with relay H) to provide 120 VAC to loads on either leg. In
invert mode there is no voltage between L1 and L2. Any 240VAC or 208VAC loads will therefore be supplied only when the
Quattro is supplied by a split phase 120/240V or 120/208V source. This prevents heavy loads such as water heaters or 240V
air conditioners from discharging the battery.