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isolated system with quattro8k, AC and DC coupled chargers.freq shifting from 50.5-52.5hz,off at 53hz.(SMA inverters).at end of day freq stays stuck at 52.7hz through the night, failing to reset to 50hz, battery voltage is now 49,1V 82% SOC. turning on the generator resets the freq, but this is no real solution.suggestions?
just checked the settings,freqshift is from 50.2 till 52.7 float 55.2V
Use equalization (tubular plate traction battery curve) unchecked
Charge curve Adaptive + BatterySafe
Absorption voltage 57.60 V
Float voltage 55.20 V
Charge current 110 A
batteries 24x 2V 1500Ah C10, AC coupled sma tl4000, sb4.0 (limit to 3k) , DC coupled: bluesolar 150/60, 3x makeskyblue 30, 40A modified, venus, BMV700, quattro 8K, 55V automatic fans, battery, room airconditioning at 20degrC
according to the PV assistant the freq should reset at 5.2V below float, or in my case 55.2-5.2= 50V.
still at 49.1V , no reset..
Hi @basreflex, can you please first upgrade your inverter to the latest firmware?
Hi @basreflex
Please read this:
https://www.victronenergy.com/live/updating_firmware:updating_ve.bus_products
If you don't have the equipment or don't feel sure about doing this, ask your installer to update the firmware for you.
@basreflex
Did you manage to get this issue resolved?
I have the same problem with a Quattro 10 and it appears to have started when I upgraded the firmware from 417 to 460 and the PV assistant.
so it's not the firmware, that I did not upgrade yet to. there is another problem in the assistant : when the system is in 52.7 mode throttling the AC coupled power, there is no mechanism to release that power when needed. I had a few temp shutdowns for overload, while the freq was at 52.7 and the quattro was not able to release more power from the ac coupled inverters, as it only can reset the freq based on battery voltage. this is a design flaw that can be improved. the ac coupled regulation technique is quite crappy if you look at the AC voltage amplitude oscillations, when in ac coupled battery charge mode
I have observed similar behavior on a 5kVA Phoenix inverter with AC-coupled PV inverters.
The frequency sticks at 52.7 Hz, until I manually switch the inverter on and off, then it start again at 50Hz allowing the Pv inverters to restart.
I would also like to see a solution to this.
Hi @Peter-ZMG @basreflex @Phil_Gavin
Did you read this information:
if you believe this is not the reason in your system, what is the site's VRM identifier?
Thanks for that reference.
This part of my system is not on VRM, unfortunately.
I now believe the issue is that due to other charging apparatus the required low voltage threshold is not reached. I export back to the grid through quattro's on the same battery bank and there are also 3rd party MPPTs on the bank.
This all props up the lower voltage threshold that the batteries reach during the day.
However, adjusting the float voltage higher, or calling the batteries "lithium" may just fool the system into attempting to reset after a frequency shutdown earlier in the day.
Hi @Phil_Gavin
You could set the Quattro charge voltages lower, thereby exporting more power to the grid.
Off course somehow the batteries have to be fully charged also, so maybe a short absorption time followed by a lower float voltage to force feed-in?
yes I know this , and my system has not obeyed these rules set forth in the FAQ. there is a SW bug somewhere..
Hi @basreflex
I'd like to help, but without more information I cannot do much.
Is the system online?
yes the system is online ,incl remote console, except i'm on business travel .if the system fails the misses will change the door locks so please be careful. vrmid
985dadcb8ae4
Hi @basreflex
don't worry, we only change settings when the users allow us.
Looking at the system:
-frequency shifting seems to work fine the last weeks, (i see august 4 it got stuck) but:
-you're on very old firmware (Quattro: 413), newer firmware for your Quattro has lot's of upgrades, among others for better handling of high temperature events. the newer Venus firmware also has lot's of updates.
-the PV inverter is configured as 'on input 1' while I suspect it is connected to the output of the Quattro?
Before we give more support we always ask to updat to the latest firmware, if problems persist then we can look into the system from support to help fix any problems.
Hi Daniel,
System is online, 985dad367a45
Your help would be much appreciated
regards Peter
Hi @Peter-ZMG
What is the problem with this system?
Hi @Peter-ZMG
When did this last happen?
screenshot is 'yesterday' and everything worked fine then
I did notice an AC in event at 17:13:
but the frequency was already ramping down then before the ac-in came on.
