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Hi, I have an installation with an 8kw Quattro and a 3kw Fronius AC coupled. 30kw of BYD Premium LVL. Also has 5kw solar on MPPT.
The Quattro shifts the frequency as expected when the battery is full, but doesn't drop it back to 50htz when the sun goes down. In some cases it drops it back at 2 or 3 am, and in the case of the attached PDF, it held it up until 6.50am the next day. Note the battery is down to 83%SOC. Freq graphs.pdf
Hi @Lawrence,
This behaviour is described here - https://www.victronenergy.com/live/assistants:pv-inverter-support#q1_-_the_system_is_locked_to_53_hz_and_does_not_resume
Please check that the Multi is correctly configured for lithium batteries and the absorption/float voltage.
Hi @Guy Stewart (Victron Community Manager)
Its not locking out at 53hz, its sitting at 52.72.
And i did read that and check all my settings. VE config settings.pdf
When the sun goes down with only 200w load the battery voltage is sitting at 53.1 on both the Battery monitor (BYD via CAN) and the VE Bus
I have a 3kw diversion load on AC2 out running off assistants. Ive noticed that once the Quattro lifts the frequency, it does it in one jump from 50 to 52.7, once up, it stays up the rest of the day, even with the 3kw diversion on and only 1500w coming from the MPPT
I might have to pass this one up to the chain, but before I can. The first thing they will ask is can you please confirm firmware version on the Quattros and the Assistant (in VE.Configure) to make sure that they are current latest release?
Chip number in the Quattro is 2655430 and i updated it to 433 b4 it was installed. Not sure how to find if the assistants are up to date, but every time i open VE Configure and it asks to up date i always do.
The CCGX and the MPPT are both up to date as well. The BYD is the only thing that is not up to date as it was a last minute substitute. The FredomWon that we sold with the job was stuck at the port in South Africa. As we never intended to use the BYD, we don't have a spare ethernet port, although if needed i can put a long range wifi on the CCGX and use its internet connection for the BYD
Alright, Updating the firmware on the Quattro is the first thing that needs to be done. The current version is 476.
There are several ways to do it, you must back up all settings on Quattro first, as they will be lost.
Once the settings are backed up (!), it is easiest to do the firmware update in VictronConnect.
Alternatively, you can use now depreciated method in VE.Flash (after getting the specific firmware file from VicPro).
Hi Guy, Any updates on this? Up until now this issue hasn't affected performance of the system as the frequency has always returned to 50 hz by the time the sun comes up the next day. I've noticed three times in the last couple of weeks that the frequency has stayed high into the next day so it now is affecting performance as the battery never made it back to 100% the first day it happened.
We ran a few tests to see if we could identify where the issues was. Firstly we turned the Canbus off, just to see if the battery was holding the frequency high, no change
We then reduced the MPPT amps to 5 as there is a large DC component, no change there either.
We also reduced the PV size in the PV Inverter Assistant, that didn't change it either.
My distributor (Rod from Taspac) has suggested replacing the Quarto but i don't want to go down that track unless we are certain it will fix the issue.
I found this thread after looking for more people who suffered from this strange frequency behaviour... As I see, the discussion is rather old meanwhile, but it seems, the issue is not solved up to now, for my offgrid system with a Quattro that has to frequency-control a AC-Fronius and a AC-Thor and working with the latest firmware also does not set down the frequency when the voltage is under the float setting (- Delta of 2.6V @ 24V system).
@guy or any other technician at Victron: Where is the problem in solving this? Isn't it a possibility to set up a simple second frequency-regulating assistant that drives the frequency narrow-coupled to the voltage up and down?
