question

basreflex avatar image

quattro stuck at 52.7hz

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?

frequency
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First of all are you on the latest firmware and are all the assistants set correctly

please supply some details of all the settings and models and how everything is connected

4 Answers
Peter-ZMG avatar image
Peter-ZMG answered ·

@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.

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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.

Phil Gavin avatar image Phil Gavin Daniël Boekel (Victron Energy Staff) ♦♦ ·

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?

Phil Gavin avatar image Phil Gavin Daniël Boekel (Victron Energy Staff) ♦♦ ·

Thanks, yes I do something like that.


basreflex avatar image basreflex Daniël Boekel (Victron Energy Staff) ♦♦ ·

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?

basreflex avatar image basreflex Daniël Boekel (Victron Energy Staff) ♦♦ ·

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.



basreflex avatar image basreflex Daniël Boekel (Victron Energy Staff) ♦♦ ·

indeed the inverters are on the output, as they are located further away.

there is one SB4.0with 4kW on 192.168.2.210,another SB4000-tl21has 2kWpanels and does not showup. I did not see any remarks on frequency shift improvements in the firmware updates ,that is why I have not yet upgraded.. should be easier now..

Peter-ZMG avatar image Peter-ZMG Daniël Boekel (Victron Energy Staff) ♦♦ ·

Hi Daniel,

System is online, 985dad367a45

Your help would be much appreciated

regards Peter

Hi @Peter-ZMG

What is the problem with this system?

Peter-ZMG avatar image Peter-ZMG Daniël Boekel (Victron Energy Staff) ♦♦ ·

It is the frequency sticking at 52.7hz

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.

Peter-ZMG avatar image Peter-ZMG Daniël Boekel (Victron Energy Staff) ♦♦ ·

It was 2 or 3 days prior, I cannot be sure. It does not happen every time. Yesterday was me intervening, I switched in the grid for 1 minute to reset the frequency as SOC was diving.

Also i should say that I am using an 'Amber control' device to switch in a high load to utilise the excess solar energy which runs for approx 5 mins in the event that the frequency reaches 50.25hz-50.5hz, to avoid switching off the solar inverters at 100% SOC. I will try a greater load as a test, although it is currently set at approx 7Kw.

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basreflex avatar image
basreflex answered ·

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..

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Hi @basreflex, can you please first upgrade your inverter to the latest firmware?

I have version 413, up to date

I dont think so I think the latest version is 459

please check again and upgrade the quattro

VRM scan only showed the bluesolar MPPT updatable, did that ..

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.

I design wireless chargers at 6.78 and 13.56Mhz for a living, and have a drawer full of programmers for MCU and FPGA. just have to wait till the misses does not watch the favourite TV.

Ah perfect :)
Let us know if it helped.

basreflex avatar image
basreflex answered ·

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

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just installed an updated PV assistant, not shure wat the update involves..

basreflex avatar image
basreflex answered ·

just checked the settings,freqshift is from 50.2 till 52.7 float 55.2V


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