Smart Meter & Ct Connections - Goodwe ET Series User Manual

Declarations for the backup function
The backup outputs of the ET hybrid inverters have overload capability.
For details please refer to the technical parameters in the ET series inverter section (Page 29).
The inverter has self-protection derating at high ambient temperatures.
The statement below lays out the general policies governing the series EH, EM, ES, ET, BH, BT and
SBP energy storage inverters.
1. For hybrid inverters (e.g. Series EH, EM, ES, and ET), a standard PV installation typically consists
connecting the inverter to both panels and batteries. When the system is not connected to the
batteries, the manufacturer strongly advises that the backup function not be used. The manu-
facturer will not honour the standard warranty and will not be liable for any consequences
arising from users not following this instruction.
2. Under normal circumstances, the backup switching time is less than 10ms (e.g. the minimal
condition to be considered as a UPS-level switching). However, some external factors may cause
the system to fail in backup mode. Due to this, we recommend that users to be aware of these
conditions and follow the instructions as described below:
• Do not connect loads which are dependent on a stable energy supply for reliable operation.
• Do not connect the loads which may, in total, exceed the maximum backup capacity.
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• Try to avoid those loads which may create very high start-up current surges such as inverters,
air conditioners, high-power pumps etc.
• Due to the battery condition itself, the battery current might be limited by factors including but
not limited to temperature and weather etc.
Acceptable loads are shown below:
• Inductive Loads: 1.5 P non-frequency conversion air conditioners can be connected to the
backup side. Two or more non-frequency conversion air conditioners connected to backup side
may cause the back-up mode to be unstable.
• Capacitive Loads: A total power ≤ 0.6 × nominal power of the model. (Any load with high startup
current is not acceptable.)
• For complicated applications, please contact the GoodWe Solar Academy.
Note:
For convenient maintenance, please install a SP 3T switch on both the backup and on-grid sides. Then it is
adjustable to support load by backup or by grid or default settings.
Backup
1
On-Grid
2
3
Load
4Pole 3Throw
1. The backup load is supplied from backup side.
2. The backup load is isolated.
3. The backup load is supplied from grid side.
Grid
Declarations for backup overload protection
The inverter will restart itself if overload protection is triggered. The preparation time for restarting
will be increasingly long (one hour at most) if an overload recurs. Take the following steps to imme-
diately restart the inverter.
Decrease the backup load power to within the maximum limitation.
On The PV Master App → Advanced Settings → Click "Reset Backup Overload History".
2.4.4 Smart Meter & CT Connections
Make sure the AC cable is totally isolated from AC power before connecting the Smart
Meter and CT.
A Smart Meter with the CT in product box is compulsory for ET system installation and is used to
detect the grid voltages and current directions and also is used to provide the operating
condition of the ET inverter via RS485 communications.
Note:
1. The Smart Meter with CT is already configured ; please do not change any settings on the Smart
Meter.
2. One Smart Meter can be used with only one ET inverter.
3. Three CTs must be used for one Smart Meter and must be connected on the same phase with the
Smart Meter power cable.
Smart Meter & CT connection diagram
PE
N
ON
L3
OFF
L2
L1
To Smart Meter
Note:
1. Please use the Smart Meter with the 3 CTs contained in the product box.
2. The CT cable is 3m long as a default and can be extended to maximum of 5m.
3. The Smart Meter communication cable (RJ45) is attached on the inverter ("To Smart Meter" cable),
and be extended to a maximum length of 100m, and must use a standard RJ45 cable and plug, as
shown below:
Grid
Power Meter
CT A connect to L1
CT C
CT B
CT B connect to L2
CT A
CT C connect to L3
Load
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