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The Inverter consists of a full bridge power stage utilising the latest generation of power MOSFET's, switching
a filter inductor and transformer tapping. The DC voltage of the solar input is switched at high frequency and
converted to an AC sinusoidal voltage and feed into the AC grid via the safety and isolation of the toroidal
transformer.
The sophisticated microprocessor control circuitry controls the switching of the power MOSFET's and
performs all the necessary checks of system parameters to ensure correct operation.
SPECIAL FEATURES
Night time disconnect
After dark when the solar input is no longer available the inverter will automatically disconnect from the AC
grid. This feature ensures that during the night, the inverter can not consume any power whatsoever while
remaining idle. Upon sunrise the next morning when solar input becomes available again, the PV edge will
automatically reconnect to the AC grid and begin generating power.
Parallel Operation
The PV edge automatically synchronises to the AC grid, therefore the output of multiple units can all be
connected together, and they will all be synchronised by the AC grid.
Note: The Solar inputs of multiple units cannot be paralleled.
Maximum Power Point Tracking
The optimum power level from the solar input depends on the available solar radiation and the temperature of
the solar modules. Even in cloudy weather with fluctuations in the solar radiation level, the PV edge constantly
monitors and tracks the optimum operating point to ensure maximum power from the solar modules is
achieved.
Protection
The AC grid supply is constantly monitored for under and over voltage, over and under frequency, and anti
islanding conditions via active phase shifts.
The DC input is protected against over voltage, reverse polarity and over current via very fast current limit
control.
Isolation between the DC input and AC output is achieved via the toroidal transformer.
The temperature of the transformer and switching devices are continuously monitored. The Inverter is fitted
with a cooling fan, which is temperature controlled and only operates when required.
Indicator Lamps
The five lights on the front panel indicate the inverter power level in increments of 20%.
Led 5 – 90% (top led)
Led 4 – 70%
Led 3 – 50%
Led 2 – 30%
Led 1 –10% (bottom led)
If the inverter were supplying 60% of full power then Leds 1, 2 & 3 would be illuminated.
Led 3 has two other modes of operation.
-
This light will be on, (constant), when the Solar input power is present and the AC grid is disconnected or
the inverter is awaiting reconnection to the AC grid.
-
This light will flash for 90 seconds when the inverter connects to the AC grid and performs a voltage and
frequency stability check before feeding power into the AC grid.
-
When Led 3 is in either of these 2 modes all other Leds will be OFF.
LATRONIC SUNPOWER PTY LTD
NVERTER OPERATION
Doc. No: M61
www.latronics.com.au
Page 5
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