7.1.- DEFINITIONS
7�1�1�- MINIMUM/MAxIMUM START VOLTAGE, AND MINIMUM STOP CURRENT
The
minimum start voltage
is the minimum voltage the inverter needs from the solar panel to
start injection into the grid and/or batteries.
The
maximum start voltage
is the voltage of the PV panels that cannot be exceeded to start
injecting power into the grid and/or batteries.
If the PV voltage is within the minimum and maximum limits, and the inverter or the battery
charger are ready to operate, the solar converter checks the solar panel insulation resistance.
If the value is ok, the PV relay is closed and the inverter starts extracting energy from the solar
panels and injecting into the AC grid and/or batteries.
Once the inverter is extracting energy from the solar panels, if the solar panel current drops
below the value set at
minimum stop current
during 40 seconds, the inverter stops. It will wait
the period defined at “
PV waiting time
” and after this, it will try to start again.
7�1�2�- VOLTAGE AND FREqUENCY VALUES TO CONNECT TO THE GRID
Due to local regulations, the values of voltage and frequency of the grid must be between de-
fined limits during a certain time before connection to the grid.
If these conditions are not met, the display shows the message “
Grid values out of limits
” and
will stay disconnected from the grid until the values are correct.
7�1�3�- MEAN AC GRID VALUE
Due to
VDE AR-N 4105
, to guarantee the quality of the grid, it is mandatory to check, at least
every 3 seconds, that the mean value of the voltage, during the last 10 minutes is not over the
110% of the nominal grid value.
If this failure happens, the inverter stops injecting into the grid and shows the warning message
“
Grid voltage too high
”.
7�1�4�- MPPT (Maximum power point tracking)
The
CirPower Hyb
has a solar panel maximum power point tracking algorithm. Solar panels
maximum power changes depending on solar irradiance and temperature, therefore, to get the
maximum power from the panel, the maximum power point should be checked continuously.
The inverter can detect local maximum points due to partial shadows over the solar panel array.
It is done by sweeping regularly all the MPPT voltage range, and ensures that it is always work-
ing at the MPP of the solar installation. The sweep frequency can be enabled by the parameter
“
MPPT sweeping frequency
” : values different than 0 enable the the detection of local maxi-
mum points and define the period of time between two consecutive sweeps.
7�1�5�- ANTI-ISLANDING PROTECTION
There is a continuous AC grid monitoring system, to detect the creation of isolated grid “is-
lands”, and to proceed to de-energize the grid and disconnect from the grid.
47
Instruction Manual
CirPower Hyb 4k-48
