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I am trying to change the float voltage of a Quattro (via a Cerbo) using VE.Can.
I send the new voltage to register EDF6 and I receive a "Vregs not supported" response.
I get the same thing if I request the float voltage data, or even if I request the device state from 0x0201.
I also note that there is a lot of traffic between Quattro and Cerbo where the Quattro is telling the Cerbo that it does not support Vreg 0x243 (one not detailed in the manual)
Any ideas?
Moving to modifications.
I am not convinced what you are attempting can be done that way.
If you look in the "VE-can-registers-public" document, it says that register 0xEDF6 (Battery float voltage level) is both readable and writeable, so why not?
Because it may be referring to solar chargers that support CAN, and not inverters that are VE BUS only.
With DVCC chargers are slaved to the inverter algo.
Many inverter settings require a restart to take effect and are not dynamically configurable.
All can only be set using the VE BUS.
Wrt to CAN comms from a BMS, cvl etc, these are not in the public docs. Only victron’s proprietary comms are. Third party are private, though available if you search online or easy enough to figure out if you sniff the various broadcasts.
There is an MPPT on the system, but it is on address 0x24. (connected to the Cerbo via VE.direct)
The Quattro is on 0xE1 and 0xE2, and that is where the error ACKs originate.
I wasn't sure which half if the Quattro to address, so I tried both, and both give the same result.
Isn't the Cerbo relaying the commands to the Quattro via VE.bus?
I also note that when I try the example given in "VE-can-registers-public" for the maximum AC current setting, I also get the same error.
Is there a list somewhere, an addendum to the "VE-can-registers-public" perhaps, that says which read/write registers can actually be written to?
They state the battery type has to be set to 255 "user defined", that is terminology more consistent with an MPPT, but it does state the register is read/write.
They also mention that not all chargers support all registers.
It is all a bit vague.
The cerbo has to function as some form of gateway as the inverters are not on the CAN bus.
It may just be that they don't support what you are trying to do.
@Ian0 What you are trying to do is not possible. The VenusOS/Cerbo will not take messages from VE.Can and relay them to the Quarto/MultiPlus via VE.Bus. The fact that you are getting error messages should be enough to inform you that the system is not designed to work like this. If you want to control the Quarto/MultiPlus then the recommended way is via NodeRed, or if technical enough by writing to the relevant paths in the dBus, but be aware things inside other parts of VenusOS may then stop working or reset your settings.
There is a lot more to this than just sending messages over CAN.
Firstly the CAN address you shared earlier are from the NMEA2000 Out capability, note the OUT. This means that it is for broadcasting on the NMEA2000 network the status and activity of the Inverter/Charger and not for receiving messages.
The second issue is related to what the Cerbo will listen to and take instructions from. It does not take any information from anything but a CAN connected BMS. Therefore the system will only listen to messages once very low level CAN messages to identify a device as a BMS, and confirm that it is a BMS have been received.
What you are trying to do is not supported and not signed to do what you are trying to do. Take a look at NodeRed, that is a far more powerful way of controlling your system.
I have to correct you on that: 0xEDF6 comes from the list of manufacturer-specific registers in the document VE.can-registers-public.pdf. It's only a NMEA2000 message inasmuch as it uses the Manufacturer-proprietary single-frame message at PGN 0xEF00
I can write to 0x0200 register and change the state of the Quattro from Inverting to Charging, so why can't I write to 0xEDF6 and change the float voltage?
but I'll have a look into NodeRed, as a method of obtaining proof-of-concept, but the final solution will be in embedded C. Do you think that the MQTT interface would be a better vehicle than the CAN interface?
If quatro's are similar to Multiplus, then the VOLTAGES should be set using the VE configure program when commissioning the system. They should not need to change after that time. For best practice, when charge curtailment is needed to allow lithium batteries to balance, then a low charge current is needed, and this can be done dynamically - and this is best done under the control of the BMS.
This is NOT a duplicate thread to https://community.victronenergy.com/questions/246687/how-to-select-float-charge.html.
One deals with setting the voltage.
The other deals with changing the mode from absorption to float, and back.
So perhaps, instead of closing the thread, perhaps you could tell me if "CommandGetSetDeviceState" (MK2.2b) which appears to be the same as "/VebusSetChargeState" is accessible from VeCan or Modbus, or even whether the MQTT is writable.
Just a reminder from the community guidelines:
The community is predominantly volunteers, and the vast majority of the answers are provided by enthusiasts. It is not an Official Ask Victron site, for that please use the normal line of support.
@ian0
Are you sure that vreg 0xEDF6 is the batt float voltage setting of a Multi / Quattro ?
In the document "VE CAN reg public" at point "1.9 Battery settings" i dont read "Multi / Quattro" ?
May be its the vreg for float voltage setting of a batt- solar- or other type of charger?
Not that I have tried this, but you are probably better off manipulating the BMS control to alter float and absorption, since BMS control can override the base programming of the quattro anyway.
