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13.18. Q18: What is the data usage of the Cerbo GX?
Data usage depends heavily on amount of connected products, and behavior and usage of those products. The measurements
below are an indication only, and taken from a system with one Cerbo GX, one Multi, one BMV and one MPPT. Log interval set to
15 minutes. If you are on an expensive data-plan, do make some fail-safe.
Data consumption per month:
VRM logging: 15MB download, 45MB upload
Remote support: 22MB download, 40MB upload
Update checks: 8MB download, 0.3MB upload (This does not include the update itself)
2 way communication: 26MB download, 48MB upload
Mentioned megabytes do not include the download of a Color Control firmware update. Firmware updates of 60MB are not un-
common.
13.19. Q19: How many AC Current Sensors can I connect in one VE.Bus sys-
tem?
The current maximum is 9 sensors (since Cerbo GX v1.31). Note that each need to be configured separately with an assistant in
the Multi or Quattro to which it is wired.
13.20. Q20: Issues with Multi not starting when Cerbo GX is connected / Caution
when powering the Cerbo GX from the AC-out terminal of a VE.Bus Inverter,
Multi or Quattro
Make sure that the GX device and MultiPlus is running the latest firmware version.
If you power the Cerbo GX from an AC adaptor connected to the AC-out port of any VE.Bus product (Inverter, Multi or Quattro),
then a deadlock can occur after the VE.Bus products are powered-down for any reason (after any operational fault or during a
black start). The VE.Bus devices will not boot-up until the Cerbo GX has power …but the Cerbo GX will not boot-up until it has
power. See FAQ for more information about this.
This deadlock can be rectified by briefly unplugging the Cerbo GX VE.Bus cable at which point you will observe the VE.Bus prod-
ucts will immediately begin to boot-up.
This deadlock can be avoided in two ways:
Power the Cerbo GX from the battery; or
Cut pin 7 in the VE.Bus cable connected to the Cerbo GX
Cutting/Removing pin 7 of the VE.Bus cable to the Cerbo GX (brown/white according to standard RJ45 ethernet cable colour cod-
ing) allows the VE.Bus products to start up without waiting for the Cerbo GX to boot up first.
Note that when using a Redflow ZBM2/ZCell battery, pin 7 should be cut even if the Cerbo GX is DC powered, to avoid the same
deadlock at times when the Redflow battery cluster is at 0% SoC.
Cerbo GX Manual
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