Multi RS Solar charging from Grid at ess mode

Hello. So sadly setting equalisation to disabled did not help. It is not charging from grid for now but not discharging battery either and taking consumption from grid. Will see at the evening but usually if it does not get to 100% from solar it will recharge from grid at evening .

It’s normal what’s happening there. The PV is going to battery and the loads must be supplied from somewhere. Hence the grid consumption.
Which is the minimum SOC limit setting at the moment of the above printscreen and which ESS mode?
Also, some ESS variables are ā€œresetā€ after a complete charge - discharge - charge cycle. ESS SOC min % limit ↔ 100% and back.
Wait and see and don’t touch the settings as you can confuse the system…

Settings are like this in the menu .

Okay will wait today what happens.

OK.
Wait, even if in this cycle it will charge from grid to 100% and then until it will go down to 20%.
Only after that, on the next (charging) cycle you can say for sure.
Like I’ve said, there are variables that are reset on the upper range and on the lower range.
And then reloaded for the next cycle.
So let the system be/alone up until it will hit 100% and then 20%.

Maybe i am asking too much but why is that ? I am just curious of how it works and why :slight_smile: .

Some decisions on the software are taken when a certain set of conditions are met.
I can’t say with a 100% certainty, but this is the feeling I’ve got studying during time Victron software (from Github, Venus OS, firmware, etc) and various discussions here on the forum.
I’ve seen variables that change only on certain conditions, I’ve seen algorithms that are keep running even if they are disabled, probably in order to proper function when they are enabled and so on.
For example, in Multi RS firmware, the algorithm for Optimized with Batterylife is running in the background and updates its variables even if it’s set to function as Optimized without Batterylife. This is evident observing the variables that are used by the algorithm.
Also some discussions - don’t remember exactly now - about (absorption maybe??) variables that are taken into considerations only at a certain point of the charging cycle and not in between. And certain things that are computed only at that point and not changing up until the next hit/charging cycle.
And so on…
Probably many things can be accelerated by a cold reset of the Multi RS after modifying the settings (power it off completely, from the switch, and then back on) but not everybody is affording or is able to do this, because of the role Multi RS is playing in certain installations.

Today, due to maintenance I had to completely shutdown the Multi RS 6000, after the maintenance I turned it back on.

The RS ā€˜detected’ incorrectly that the battery was almost empty (5%) and started charging the battery from the grid with 95 Amps!

However according to the Smart Shunt, VRM and the BMS the battery was at 80%…

I don’t want to charge from the grid, only from the solar panels!

Then I synchronised the ā€˜charge status’ in the battery section in Victron Connect to 100%, and charging from the grid stopped.:smiley: (om vervolgens oliebollen te bakken op accustroom :melting_face:)

But now the RS thinks the battery is at 100%, but actually it is 20% less.:confounded_face:, it should be possible to disable the RS own battery monitor!

Multi RS does what it can when it comes to correctly determine the SOC… :slight_smile:
The sole method is through voltage and that it’s not always reliable when it comes to LiFePo4 for example.
This is why is better to have the BMS, or the shunt, to properly communicate the SOC to Multi RS through a Cerbo-like device.
In other words to properly set the battery monitor in Cerbo’s menu.

That’s because the SOC was way below the minimum SOC limit and the batterylife state was Recharge - see above.

The Bms is set as battery monitor in the Cerbo…

Screen shot from the VictronTouchscreen:

What about Cerbo? Did you reset it too?
Because up until the Cerbo boots and is able to communicate with JK and then JK sends the correct data and then Cerbo broadcast it on the CAN bus, the Multi RS tries to determine the SOC by itself and acts accordingly.
Maybe you should have waited a little bit more…

Yes next time some more care when you/ I disconnect a Victron system, I also disconnected the batteries.. so the cerbo was also off…

As I mentioned earlier, I’ve also been having problems with the ESS function ā€˜Optimized without battery life’

The strange thing that happened today was that all the power required for the AC Output came from the grid, and all the PV power charged the battery!

Until the day before yesterday, the PV power was used to cover the AC Output first, and surplus PV power went into the battery. (Optimized without battery life)

Just for the fun, I tried the ESS function ā€˜External control’ today to see what happened… Remarkable ESS seems to be working as it should be in the ā€˜Optimized without battery life’ mode! But I don’t have External Control.. so what’s going on here?

I can’t test it further as PV power is getting low.

Just to warn you … it will discharge battery up to the point of low voltage shut down and turn off. I trief that too. Proceed with caution. What i guess happens is that on old multis the ESS setpoint is anount of energy transfered between DC→AC so basically inverter power. For Multi RS it seems this point is at the AC input. So if the Setpoint is 0 then it works as Optimised without battery life. Just no clue how to make it stop discharging to not shut down that seems to be bug as well. Not sure how it was on old Multi. I have never tried the external control.

You are probably between ā€œMinimum SOC limitā€ and ā€œMinimum SOC limitā€ +5%
I.e., if you have Min SOC limit set to 20%, you were between 20% ↔ 25%.
In such cases all PV goes to battery. Then over 25%, it will go to AC output and the rest to battery.

Soc was approximately 65 % 2x 16 kwh battery.

Found several post with ESS problem without any solution.. not a good sign.

To Victron’s defense they have stated in the manuals that MultiRS does not have full implementation of ESS yet. So it still has some bugs. And also MultiRS is pretty new platform and missing a maturity old multis have. And even the price does not look too bad considering you have 2mppts on board. But kind of wish they kept it as with old inverters that there is Phoenix, Multi and Easysolar. So inverter, inverter/charger and Inverter charger +mppt. Because in most instalations i have made i did AC Coupled solar with optimisers. There built in MPPT is just added cost which would not be used.

With my multi rs 6000 I have no access to ā€œ ESS wizard/ assistantā€

On my Victron touchscreen connected to the Cerbo, ess wizard is NOT available but I have never need it. I do all my settings in VictronConnect.

ESS ā€˜Optimized without battery life’ was until 2 days ago running without any problem.

settings for Multi RS are not in ESS menu in Cerbo. Try to check in Devices > Multi RS > ESS There is same ess settings as in victron connect.

Genlemen. It did not help. Today no pv is used to power the loads just to charge the batteries..

Don’t get me wrong, but I’m a little bit puzzled…
In the first post you were bothered that it charged the battery from the grid with 3x10A.
Now you are saying that it’s not OK that the solar goes to battery and nothing from the grid and the grid powers only the loads.
How do you want it to work?

Up until you’ll reach 100%, the PV will go to battery and only then to the loads.

The fact that it says Bulk, it means that the whole process is controlled by the internal RS logic and the BMS is not controlling the DVCC system.
If the BMS would have controlled the DVCC logic, it would have said External Control.
Do you have the DVCC enabled?

On my system, as soon as the solar day is starting, it changes from Inverting to External control and all works as it should, controlled by the DVCC that in turn is governed by the battery’s BMS.