External Energy Sources In The Off-Grid System; Generator As An External Energy Source; Electricity Grid As An External Energy Source; Generator And Electricity Grid As External Energy Sources - SMA SUNNY ISLAND 8.0H Installation Manual

SMA Solar Technology AG

10 External Energy Sources in the Off-Grid System

10.1 Generator as an External Energy Source
A generator in the off-grid system acts as an energy reserve and supplies the stand-alone grid with
additional energy if insufficient energy is being supplied to the loads.
Possible generators
Generators with autostart
function
Generators without autostart
function
Generators that can be
electrically remote-started and
do not have their own control
system, generators with
GenMan
10.2 Electricity Grid as an External Energy Source
You can use the electricity grid in different ways:
• The electricity grid can be used as an energy reserve.
• The electricity grid can be the main supplier of the loads in the stand-alone grid, with the off-grid
system as a backup system.
In a backup system, the electricity grid supplies the loads in the off-grid system. The off-grid
inverter switches to stand-alone grid operation only when the electricity grid fails. In stand-alone
grid operation, the off-grid inverter supplies the off-grid system from the battery and the stand-
alone grid is not connected to the electricity grid.
Requirements for operation on the electricity grid
The off-grid inverter does not meet the requirements for operation on the electricity grid in many
countries.
• Ensure that the local standards and requirements are met.
10.3 Generator and Electricity Grid as External Energy Sources
You can implement a combination of the electricity grid and a generator as an energy reserve. This
is particularly useful in the case of long-term grid failures where the battery capacity is no longer
sufficient to bridge the grid failure after a period of time. For long-term grid failures, you can switch to
the generator.
Installation Manual
Explanation
These generators are started and stopped with a single contact.
These generators do not have electric starting devices. These
generators are started with a cable pull or a crank, for example.
These generators have two control contacts: one contact for the
starter and one contact for the ignition or for pre-heating. The
GenMan generator manager is required for control. GenMan is
available from SMA Solar Technology AG as an accessory.
10 External Energy Sources in the Off-Grid System
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