DAYLIFF SUNVERTER 3, Installation & Operating Manual

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3.8 Hybrid Installation
SV3 series solar pumping inverter provides PV and AC hybrid power input
function, as shown below, PV input is connected to bus circuit through anti-reverse
diode. Through anti-reverse diode and AC power input is rectified through rectifier
bridge then connected to bus circuit. Two kinds of power can be connected with
the inverter at the same time, and the hybrid power drives the water pump to work.
Hybrid Power Supply Main Circuit
Three Phase
AC Power Input
PV Array Input
Inverter
Bridge
PV+
R
U
PV-
S
V
T
W
Fig 19
Hybrid Mode
Solar priority mode (Pr6=1) default.
Where there is both AC and PV power inputs, inverter adjusts pump running speed
prioritising solar power and only blends with AC power when there is insufficient
solar power. Insufficient solar power is detected when the pump speed falls to the
set value 30Hz.
AC+PV blending (Pr6=0)
When there is both AC and PV power inputs, inverter drives the pump running at
rated speed. Solar power usage is much higher when the solar irradiance is high
2
(near 1000 W/m )
Model
SV3-M
SV3-T
AC Input Voltage (VAC)
1PH/220V - 240V 3PH/380V - 415V
Recommended PV array voltage conguration:
As shown below, if the value of maximum power point voltage (Vmp) of the PV
array is equal to value of the bus voltage (Vdc) when the system is running, the PV
array will output the maximum power (Pmax). If Vmp deviates from Vdc, the more
the deviation, the less PV array power output. Therefore, in order for the PV array
to output the maximum power as much as possible, it is recommended to
configure the Vmp of the PV array to be near the bus voltage value Vdc. The Vdc
can be determined by the following formula:
Vdc= √2 ∗V rms