Autotransformer - Split Phase 120/240V - 100AMP
The Autotransformer: for step up, step down and split phase balancing An
autotransformer can be used for step up, step down and split phase output
balancing purposes. While the step up and step down functions are fairly
straightforward, split phase output balancing may require some more
attention.
Consider for example a 30A 120/240V split phase supply. The supply could be
the grid, a generator or two stacked inverters. Some of the loads connected are
240V, others are 120V. On each 120V leg the load should not exceed 30A. The
problem is that as soon as 120V loads are connected, the two legs will show a
different current. This is because the 120V loads on the two legs will never be
balanced. A 120V 1200W hairdryer, for example, will draw 10A from one leg. A
120V washing machine could even draw in excess of 20A from one leg. Between the
two legs the difference in current, or current unbalance, will therefore often
be 20A or more. This means that the 30A supply will not be used up to its full
potential. By the time one leg draws 30A, the other leg may be drawing no more
than 10A, and increasing the 240V load, for example, will result in an overload
of one leg while the other leg still has spare capacity. Theoretically, the
total power that can be drawn from a 30A 120/240V supply is 30 x 240 = 7,2 kVA.
In case of 20A unbalance, the practical maximum will be 30 x 120 + 10 x120 =
4,8kVA, or 67% of the theoretical maximum. The solution is an Autotransformer.
By leaving the neutral of the split phase supply unused, and connecting an
Autotransformer to create a new neutral, as shown in figure 1, any load
unbalance is ‘absorbed’ by the Autotransformer. In case of a 30A supply, the
load can be increased to 7,2kVA, and a 20A load unbalance will result in one leg
supplying 40A, and the other leg 20A. The 20A difference will flow through the
neutral and the windings of the Autotransformer. The current through both 120V
wires of the split phase supply will be 30A.
Ground relay for use with Multi or Quattro Inverter/Chargers included When
operating in inverter mode, the neutral output of the inverter/charger must be
connected to ground to guarantee proper functioning of a GFCI. In case of a
split phase supply the neutral must be grounded. For this purpose a grounding
relay is built in the autotransformer’s enclosure. The relay is controlled by
the 230/240V Multi or Quattro. (The internal grounding relay in the 230/240V
Multi or Quattro must be disabled)
Temperature protected In case of overheating, the Autotransformer is
disconnected from the supply. Reset is manual.
An alternative to stacked inverters The alternative to stacking two 120V
inverters to provide a 120/240V split phase supply is a 240V inverter with an
additional Autotransformer.
Quick Guide
WARNING:
This product can expose you to chemicals including Di-n-hexyl Phthalate (DnHP)
which is known to the State of California to cause reproductive harm, and
Vinyl Chloride which is known to the State of California to cause cancer. For
more information go to 
