In the case a replacement or a expansion of sungrow battery modules, please see first the two main conditions :
Battery mixing
Module expansion
Discharging or Charging the battery tower should be done by the installer, as a suggestion Sungrow suggests following one of these procedures.
Scenarios:
If the customer needs to add more battery modules (for example, add two battery modules to an existing SBR096).
If one battery module is faulty and new battery module needs to be replaced.
If two battery modules need to be removed.
How to add or replace new battery modules (to an existing tower):
Before adding a new battery module the battery modules in use need to be charged or discharged to match the SOC of the new battery (it should be within 10% SOC difference as mentioned above). New battery’s SOC can be estimated with knowing manufacturing date and storage time (Table 2.).
Fig.1
If:
the customer needs to add more battery modules (for example, add two battery modules to an existing SBR096).
one battery module is faulty and new battery module needs to be replaced.
please follow these steps to be able to match the newly added module’s and the battery tower’s SOC via iSolarCloud website:
1. In case that discharging the battery to the grid is acceptable by the grid provider, these steps can be followed:
After logging with your account, select on the left bar "Settings", and then inside this tab, select the plant and click on "Advanced Settings". Note that the Initial Grid should have been Already set.
Fig. 2.
Inside Advanced settings, and select Compulsory Mode in the Energy Management Parameters tab, set Charge as a charging command (Parameter 1-1) and set Charging/Discharging Power (Parameter 1-2) then apply the settings.
Fig.3.
Set the SOC Upper Limit to 100% and the SOC Lower Limit to 20 % (calculated value for the new battery). Apply the settings. By charging the battery to 100%, a calibration is performed to improve the accuracy of SOC.
(This takes some time, can be omitted and the target SOC value can be directly set and charged or discharged to the target SOC).
Fig.4.
After charging to 100%, select discharge, set Charging/Discharging Power (Parameter 1-2) and apply the settings. The battery will automatically discharge to 20% and stop.
Fig.5.
Afterwards the battery SOC will match SOC of the new battery module 20%, so the installer can install the new battery module.
Fig.6.
After replacement, stop Compulsory mode and reset Upper and Lower SOC Limit to its original values. (default set: SOC upper limit 100%, SOC lower limit 5%*)
*SOC lower limit should be recommended locally, as it varies from location and usage.
2. In case that discharging the battery to the grid is acceptable by the grid provider, these steps can be followed:
One day before installing the newest battery module please control that in the “Energy Management Parameters”, the “Energy Management Mode” is set to “Self-Consumption”, as in Fig.7. This can be done via iSolarCloud Advance Settings (previously explained).
Fig.7.
Inside "Battery Parameters":
Set the SOC Lower Limit to 20 % (or calculated value for the new battery)
Set the Max. Charging Power to 0.1 kW, this will cause the battery to be mostly discharged by the the loads until the next day and it should reach 20% SOC without the need to force it to discharge to the grid.
Fig. 8.
Control whether the battery SOC has reached the estimated SOC of the new battery module. Afterwards the battery tower can be expanded without any issue . Above values can then be set back to their original values, where line 4 and 5 should be max. of 1 kW per battery module for the first week, supporting the balancing. Line 6 can be set to the new battery capacity value, in above example e.g. to 19,2 [kWh] in case one battery module had been added.
Click “Apply Settings” and later for value confirmation “Inverter Parameter Query”
If:
If two battery modules need to be removed.
It is possible to remove two modules directly, because the power of the five modules is the same. If we remove two battery modules, the remaining three battery modules will also work normally.
For further information, please download the user manual here. (modify link to SHT user manual when available)
This manual is intended for professional technicians who are responsible for installation, operation, maintenance and troubleshooting of inverters, and users who need to check inverter parameters. The inverter must only be installed by professional technicians.
The professional technician is required to meet the following requirements:
Know electronic, electrical wiring and mechanical expertise, and be familiar with electrical and mechanical schematics.
Have received professional training related to the installation, commissioning and troubleshooting of electrical equipment.
Be able to quickly respond to hazards or emergencies that occur during installation, commissioning and troubleshooting.
Be familiar with local standards and relevant safety regulations of electrical systems.
Read this manual thoroughly and understand the safety instructions related to operations.