SMA Solar Technology AG 10 External Energy Sources in the Off-Grid System
Installation Manual SI80H-60H-OffGrid-IA-en-11 129
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.
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.
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.
Possible generators Explanation
Generators with autostart
function
These generators are started and stopped with a single contact.
Generators without autostart
function
These generators do not have electric starting devices. These
generators are started with a cable pull or a crank, for example.
Generators that can be
electrically remote-started and
do not have their own control
system, generators with
GenMan
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.
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.
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