Cooling; Grid Monitoring; Data Communication - Steca StecaGrid 3000 Installations- Und Bedienungsanleitung

7.4

Cooling

The internal temperature control system prevents excessive operating temperatures. When the inter-
nal temperature is too high, the inverter adjusts the power consumption from the solar modules to
reduce the heat dissipation and operating temperature.
The inverter is convection cooled via fins on the front and rear side. A maintenance-free fan circu-
lates the heat within the closed casing evenly over the entire surface of the casing.
7.5

Grid monitoring

The inverter constantly monitors the mains grid parameters while feeding the grid. If the grid devi-
ates from the legally prescribed specifications then the inverter automatically switches off. When
the grid conforms to the legally prescribed specifications then the inverter automatically switches on
again.
The legally prescribed specifications for the grid parameters are described in the Table of coun-
tries, P. 85.
7.6

Data communication

7.6.1 Data
The inverter displays the following data and stores it permanently in internal memory (EEPROM).
Displays
• Voltage and current of the solar generator
• Power and current fed into the grid
• Voltage and frequency of the power grid
• Energy yields on a daily, monthly and annual basis
• Error conditions, notes
Some of this data can be sent to the devices listed under 7.6.2.
Save (EEPROM)
• Event messages with date
• Energy yields on a daily, monthly and annual basis (Tab. 7)
The storage resolution of the energy yield data is as follows:
Energy yield data
10-minute values
Daily values
Monthly values
Annual values
Total yield
Tab. 7: Storage resolution of the energy yield data
7.6.2 Interfaces and connected devices
The inverter communicates with other devices via an RS485 bus. The following applies:
• The inverter has two RS485 interfaces (RJ45 sockets) on the lower side of the casing.
• The beginning and end of the RS485 bus must be terminated; see also Section 7.6.4.
• Standard RJ45 cables can be used as bus cables (Cat-5 patch cables, not supplied). Use an alter-
native data connection cable for longer connections; see 7.6.3.
• The inverters connected to the RS485 bus operate as bus slave units.
Note
The following inverters have compatible data interfaces and can also be connected to the RS485 bus
as slaves: StecaGrid 2020, 8000 3ph, 10000 3ph, 8000+ 3ph, 10000+ 3ph. Observe the manuals of
these devices concerning the definition of addresses, termination and permissible data cables.
• If an optional device is connected to the bus, then this device operates as a bus master.
• Only 1 master may be connected to the RS485 bus at any given time.
The following optionally available devices support the transfer protocol used by the inverter:
746.217 | 12.27
Storage resolution/
period
31 days
12 months
30 years
30 years
permanent
EN
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