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How do I start up the WEB’log Residential?

There are clear and detailed connection and start-up instructions in the WEB’log Residential quick start guide. This is supplied with the product or can be downloaded from the Download of the meteocontrol homepage.

What should I do if I don't have a crimping tool for RJ12 and RJ45?

RJ45: Use a patch cable and cut the plug on one side. This produces a connection cable to the ripple control receiver.

RJ12: You can use an ISDN cable, for example.

Where do I find the WEB’log Residential hardware serial number?

The serial number will be structured as follows: 798038 xxxx xxxx. It can be found on the back of the data logger. The data logger is provided with a separate sticker which can be affixed for documentation purposes.

Does a network cable have to be used for the inverter?

Yes, this is necessary in order to prevent interfering signals in the data bus. Use a CAT 5e cable or higher. We recommend using the meteocontrol connect cable to ensure easy and safe set-up.

Why does the last inverter have to be terminated?

It must be terminated in order to ensure stable bus communication to the inverters.

How many inverters can be connected to the WEB’log Residential?

  • One to three inverters by the same manufacturer.
  • Use the "Device Management Tools" for recording and configuration purposes. The bus scan (RS485) can be triggered in the "Inverter" category.

What do I do if no inverter is found?


  • The bus cabling between data logger and inverters
  • Termination  

If still no inverter is found, carry out a firmware update.

Why does the polarity need to be correct when an energy meter is connected?

There are 24 V pulses which can only be registered with the correct connection to the data logger.

Can another power supply be used for the data logger?

We recommend using only the enclosed power supply in order to ensure the device-specific voltage, polarities and power output.

Can the WEB’log Residential also be configured via internet?

It cannot be configured via a browser. It must be configured using the "Device Management Tools". To do so, the data logger has to be connected to the computer via a USB.

What do I do if the network connection status displays an error in the "Network" (DMT) category?

Check the cable connection between data logger, router and switch. Check whether the LEDs on the Ethernet socket of the data logger are flashing. If both LEDs are dark, no physical connection is established.

How do I update the firmware?

A firmware update can be carried out in the "WEB’log" category of the "Device Management Tools". A corresponding update file can be chosen and transferred to the WEB’log Residential by clicking "Perform Update". You can find the latest firmware on the meteocontrol homepage in the Download area. There you can chose the appropriate inverter manufacturer and save the driver locally to your PC.

What does the lock symbol mean at the top of the "Power Control" (DMT) category?

The write protection for the Power Control configuration has been activated on the WEB’log Residential.

  • Switch to the right: Implement and transfer Power Control settings in the "Device Management Tools"
  • Switch to the left: Power Control is active

How can I check how the Power Control functions under the influence of external specifications (e.g. ripple control receiver) on the data logger?

When Power Control has been activated, simply produce a jumper between pin 7 and pin 8. The data logger will interpret this as 0% grid feed-in and will regulate the inverter down.   

What do I do if a ripple control receiver with 3 relays is built into the system?

The "Power Control" category of the "Device Management Tools" differentiates between connections with 3 or 4 relays. The correct setting must be chosen.

How can I take account of on-site energy consumption?

On-site energy consumption can be taken into account in the "Power Control" category of the "Device Management Tools". Either an S0 feed-in meter (connection 3) or an S0 consumption meter (connection 5) must be connected to the WEB’log Residential data logger to ensure proper calculation. The maximum grid feed-in (P(fix) in %) must be set in accordance with the specifications of your energy supplier in the "Device Management Tools". When using P(fix), no ripple control receiver is required.

What do the LEDs on the data logger mean?

Please read the WEB’log Residential quick reference guide. This lists the meanings behind the LEDs and buttons.

How can I mute the audible alarm?

Press the "MENU" or "ACTION" button. In order to be able to read the error, please use the "Device Management Tools". The audio signals can also be permanently switched off in the "WEB’log" category.

How can I switch off the LED alarm?

Briefly press the "MENU" and "ACTION" buttons at the same time. In order to be able to read the error, please use the "Device Management Tools".

Where do I find the WEB’log Residential data logger Operating Instructions?

The WEB’log Residential Operating Instructions can be downloaded from the Download area of the meteocontrol homepage.

How do I re-start the WEB’log Residential?

There is a Reset button on the right-hand side of the housing of the data logger behind the housing cover. It can be pressed using a paperclip. You can also unplug the power supply for approximate 30 seconds and then plug it back in.

How do I return the WEB’log Residential to delivery status?

  • Press and hold down the "ACTION" button
  • Re-start the data logger by unplugging the power supply and plugging it back in
  • After approx. 10 seconds, release the "ACTION" button
  • The LEDS will flash in sequence  

The configuration and/or the measurement data in the portal will not be affected by this.

How long is the measurement data stored for?

The measurement data is stored (locally) for max. 3 days in the flash memory of the data logger. The measurement data is also automatically transferred retrospectively for 3 days to the portal.

Which measurement data is read by the inverter?

  • Inverter power
  • Inverter interval energy
  • Active power specification

Portal safer’Sun Public

Which data loggers can be registered in the safer’Sun Public portal?

  • WEB’log Residential
  • WEB’log Comfort
  • WEB’log Light+ 20
  • WEB’log Basic 100
  • WEB’log Pro unlimited

What is the maximum power that can be used with the safer’Sun Public portal?

20 kWp

What are the fees for using the safer’Sun Public portal?

When using a meteocontrol data logger and registering via the meteocontrol homepage, use of the safer’Sun Public portal is free of charge.

What are the steps for registering the data logger?

1. The data logger must be installed and configured on site
2. Establish an internet connection
3. Switch on data logger
4. Wait until portal connection is established
5. Register on the safer’Sun Public portal or scan in the QR code
    (only possible with WEB’log Residential)

Is it possible to upgrade to safer’Sun Professional?

It is possible to upgrade. Please contact our Sales or Support teams for more details.

Is it possible to downgrade from safer’Sun Professional to safer’Sun Public?

Yes, however only if the system power is below 20 kWp.

In which languages is safer’Sun Public available?

  • German
  • English
  • French
  • Spanish
  • Italian
  • Japanese
  • Chinese
  • Dutch

Is the recorded data available following an upgrade?


How often is measurement data transferred to the safer’Sun Public portal?

The data is transferred every hour.

Which portals can I use in conjunction with WEB’log Residential?

All meteocontrol portals can be used: safer’Sun Public, safer’Sun Professional and VCOM.

Industrial Line

Feed-in management

Why does the inverter have a too low feed-in during P(fix) regulation?

The WEB’log transfers the PowerControl orders as percentage value to the inverter. These correspond with the provided nominal power. Usually system nominal power is higher than inverter nominal power.

With these cases the system has too low a feed-in at P(max). Therefore a manually given P(fix) has to be entered to adjust this setting, the value corresponding to module nominal power.

Inverter nominal power: 10 kW 
System nominal power: 10.5 kWp 
P(fix) value: 85 %

In this example the control value is now set at 85% of 10.5 kWp instead at 85% of 10 kW.

Alternatively newer software versions for the WEB’log provide an additional feature named “correction of inverter nominal power”. If the sum of inverter nominal power SrE is entered here, the WEB’log calculates the deviation between inverter nominal power and system nominal power, adjusting the settings according to the example given above if necessary.

Power Control Unit + (PCU+)

With which operating systems is the software „Device Management Tools“ compatible?

  • Windows 7
  • Windows 8

What is the Standard IP Address of the PCU?

The standard IP address is

For older models, this can deviate. In those cases, use these two variants:
old1:, old2:

Which protocol and port does the software „Device Management Tools“ use to communicate?

Protocol used: UDP 
Port: 21337

Why is the PowerControl configuration page for the WEB’log greyed out and cannot be modified?

1. The PCU’s write protect is enabled. By deactivating the write protect the configuration page can be modified again.

2. Communication by Modbus (TCP or RTU) between data logger and PCU was interrupted.

Why is the write protect activated despite the PCU not being connected?

The option for write protect is saved in the WEB’log. To deactivate it, the PCU has to communicate with the data logger. With newer versions of the WEB’log software the write protect is no longer activated when communication is disrupted.

Which RS485 port do I have to use?*

You can use both the left or right port. Please make sure the termination is active if the PCU is only connected to the WEB’log.

*Only has to be considered when connected via RS485. TCP is not relevant with Modbus use.

How do I enter the RS485 (Modbus RTU) address?*

At delivery the PCU has address 1. You can configure the address as 2-digit HEX-value by using the yellow rotary switches: left high, right low.

*Only has to be considered when connected via RS485. TCP is not relevant with Modbus use.

Serial (RS485 / Modbus RTU) communication parameters*

Baud rate: 9600 Data format: 8N1

*Only has to be considered when connected via RS485. TCP is not relevant with Modbus use.

What is the function of the RS232 interface?

The RS232 interface of the PCU is without function and was added for a certain telecontrol device. This device is no longer inserted, so the interface is without use at this time.

The PCU+ no longer features a RS232 interface.

How do I update the software of a PCU?

Select the page Admin-Measurement -> Power Control -> PCU Configuration (Device Configuration for older firmware versions) in the WEB’log menu and select software update at the bottom of the website.

Current version number for PCU: R09. Current version number for PCU+: R05. If no firmware can be selected, the data logger does not require an update.

The required driver respectively the download link for it you can request via mail at  technik@meteocontrol.de.

Why can’t I select the Power Control page of the WEB’log?

The browser does not support HTML script. Please use Firefox or Google Chrome for browser updates.

Why is the potential-free signal of the radio RCR not recognized?

The jumper between +24V and +IO (respectively GND and –IO) is missing or not connected properly. Please check page 18 of the user manual (Contact Options).

Why isn’t the value of the pulse signal kept up?

Please check via web interface of the WEB’log under the page Admin-Measurements -> Power Control -> PCU configuration (Device Configuration for older firmware versions) if the pulse group “Yes” is selected. Only then the pulses are converted via digital input of the PCU. If the pulse group “No” is selected, continuous signals are processed instead.