Changing The Permitted Reverse Power To The Generator; Setting The Current Limit For The Generator Depending On The Frequency - SMA SUNNY ISLAND 8.0H Installation Manual

7 Commissioning
7.14.4 Changing the Permitted Reverse Power to the Generator
If the reverse power for the set time is exceeded, all off-grid inverters disconnect the generator from
the stand-alone grid and block connection of the generator to the stand-alone grid for the minimum
stop time.
Damage to the generator
In case of reverse power, the AC sources in the stand-alone grid drive the generator. The generator
can be damaged as a result.
• Observe the information from the manufacturer about reverse power protection of the
generator.
• Set the generator reverse power and the permitted time for reverse power in accordance with
the manufacturer's specifications.
1. Switch to expert mode (see Section 7.6).
2. Select the 234.13 GnRvPwr parameter and set it to the active power of the generator reverse
power.
3. Select the 234.14 GnRvTm parameter and set it to the time for the generator reverse power.
7.14.5 Setting the Current Limit for the Generator Depending on
the Frequency
Interdependency of frequency and current limit:
The higher the generator current, the higher the torque for the generator. The speed drops with
increasing torque for unregulated generators. When the torque drops, the frequency of the generator
voltage is also reduced.
If the frequency of the generator voltage falls below the rated frequency, the generator management
can also limit the generator current. The lower the frequency, the more the generator current is limited
by generator management. This setting is useful if the generator is supplying other loads in parallel
with the off-grid inverter. This setting allows the maximum load to be placed on the generator without
overloading it.
Requirement:
☐ The generator must not be an inverter generator. The output frequency of inverter generators is
fixed.
1. Switch to expert mode (see Section 7.6).
2. Select the 234.03 GnCurNom parameter and set it to the desired value. Tip: A suitable value
for the 234.03 GnCurNom parameter is 80% of the maximum generator current per phase.
3. Select the 234.15 GnCtlMod parameter and set it to CurFrq. In this way, you will activate the
frequency-dependent current limitation.
104 SI80H-60H-OffGrid-IA-en-11
SMA Solar Technology AG
Installation Manual