Chapter 12. Battery charger module
4. System „auto-on-off-grid”
The priority is to send all energy obtained from renewable sources to the electricity grid. Only in a situation
where, for some reasons, the electrical grid is turned off, the system through the PS100-INT module
immediately disconnects from the electrical network and turns into :Off-grid” operation mode (see point 3
above). Only at this moment the cooperation with batteries takes place.
In the situation when the electric network is switched on again, the PS100-INT module sends information
about it to the inverter and the electrical loads are switched to the mains supply. Then the inverter
synchronizes again with the grid and goes into "on grid" mode.
NOTE: in this mode, if the battery voltage drops below the U
LL
level (par. 5.7) the system will start charging
the batteries from the mains and from renewable sources until the voltage will increase to the value from
parameter 5.6.
Renewable
sources of
electricity
Inverter
PS100
Rechargeable
battery
Electrical
load
Grid connection
point
ps100-12-2-en
PS100-INT
Fig. 12.4. Energy flow in „auto-on-off-grid” system
Fig. 12.4 shows the flow of electricity in the "auto-on-off-grid" system:
• The solid green line shows the situation in which the electrical grid is connected; renewable energy
is supplied to electrical consumers and the surplus is sent to the electricity grid.
• The dashed blue and dotted red lines represent the "off-grid" system (described above in item 3),
into which the system will switch after the power outage.
• The dotted-dotted brown line corresponds to the situation in which the batteries have reached the
minimum permissible U
LL
voltage and are charged from RES and from the electricity grid.
5. „Off-grid MPPT”
The inverter works in off-grid mode, but without a battery charger. An electric boiler may be connected at the
inverter output. The system will automatically adjust the output voltage to the heater resistance in such a way
as to transmit the maximum power resulting from the MPPT algorithm.
NOTE: the maximum voltage at the inverter output is 230VAC. Therefore, heaters with adequate power for
230VAC should be used.
52 PS100 – User manual
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