question

@harry4516

What you're seeing is likely just the reporting schedule in the Cerbo. It will still continue as it always has, and even it's values don't get sampled at the same time. Switching power supplies and ac motors typically cause such reporting variations.

What's happening behind the scenes though you can't see. But hopefully your ESS is performing better..

hi @harry4516

What is the response speed to high load change with this meter?

I was using ET112 (single phase) and the reaction speed to high load change was terrible. (I've documented it in the other thread: https://community.victronenergy.com/questions/51697/victron-ess-et112-slow-response.html).

Can you do a video how the system is behaving when there is sudden high load change (let say 2kW load change)?

After reading all this comments from Victron about speed improvement I would like to see how it is looks like in the real life. Is it really much better that the old ET112 meter? The price of the new meter is really high and I just can't justify the money spend if I won't be absolutely sure that the new meter is really good.

Hi mysik,

the resonse speed using the new meter is still low.
However the measurement speed of the new meter is really very very high, the incoming values in the cerbo display are updating multiple times a second. So the speed of the new meter should be fine.

But even with this fast measurement speed the reaction to load changes has not improved compared to the EM24.

I think the multiplus-2 is the bottleneck, without improving the reaction speed of the MP2 its not worth to change an existing meter against the new one.

I did some records via MQTT, this is how ESS looks like if set to 0 watts:

so no change to the previous EM24.
My hope was that someone tells me to update the MP2 to any future version, but no response so far.

Is there any update here?
I also thinking about to change my EM24 against a VM-3P75CT to increase the speed for my ESS.

All processes on a multitasking environment are based on timers and events.

Venus OS has - according to its scripts - the following timers when it processes its signals.

So, no matter how quick the "outside world" is supplying its data, it will process the variables at the following minimum rates:

Battery Data = 5 seconds
Battery Life = 15 minutes
Battery Sense = 3 seconds
Buzzer Control = 0.5 seconds
DVCC = 1 second
DESS = 1 second (default 5 seconds)
Schedule = 5 seconds
Sources = 10 seconds

DBus Updates = 1 second

Indeed, if you write your own scripts, with lower intervals, you can take advantage of the improved speed of various devices.

I’ve been doing lots of detailed measurements using an EM530, which has a 10 Hz update rate. The 1 second delay in responding is plainly visible.

Here is a video with the VM-3P75CT installed in my ESS.
In Germany we are limited to 400W/s.

The grid setpoint is -10W.
Why does it take so long until the grid setpoint is reached again?
The Multiplus II takes quite a long time for the last 500W.

(3 phase grid with one Multplus II and 2 US3000C)