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I have a site that discharges battery on keep battery charged? does anyone know why?

Please note this is a backup system. Battery is on 99,9%

Hello All,

I am facing an issue with my system, which is made of the following :

Multiplus 48/10000/140/100, Fronius Primo 8.2-1 on the AC out with 12kwp solar panels, 75kw Li-ion battery pack on CAN BMS, and an MPPT150-35 with 1.2kw solar panels on the DC side. An external EM24 ethernet meter is used. All are to the latest firmware.

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The system is configured as ESS, with limited injection, and DVCC is ON.

And now the issue :

When I activate the DC coupled surplus injection in the ESS settings, the Charge Voltage Limit (CVL) is not anymore followed by the system. Instead, the batteries are charged to CVL+0.4V. This seems to be "normal", as per Victron DVCC operating manual. However, when there is no more sun, the batteries are discharged to the grid at the limited power defined in ESS/Grid Injection settings, until the battery voltage reaches CVL.

With DC coupled surplus injection de-activated, the battery charges to CVL (not more), and there is no grid injection from batteries when there is no more sun.

Request (please) :

Since I did not find it, is there an option to avoid draining battery in the grid with DVCC and DC coupled surplus injection activated, and remove the +0.4v offset? Otherwise, it would be of great use to add it.

Thank you,

Fred

Hi,

My EasySolar-II 48/3000/35-32 software behaves unexpected.

Battery shows discharging all the time down to 0% SOC. I was advised to buy the BMV module to solve this.

I think the software calculates internal loss as power taken from the battery (altough solar and grid are available and batteries remain fully charged).

In the attached picture AC loads + Grid Feed almost equals PV charger output.

Battery voltage is always 52.80 (from 100% SOC down to 0% SOC) so the 198 watt discharge is a faulty indication.

However, the voltage of the battery is available to the software so a rough SOC can be calculated anyway, without shunt. Its a software design error. I would appreciate an update not giving this miscalculated discharge and SOC.

Have a nice day !

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Hi All,

Does anyone know why the remote console screen shows ESS #3 (BMS disabled charge) while on Victron Connect it shows ESS #4 (BMS disabled discharge)?

The inverter remains in passthru until battery cell voltage naturally decays sufficiently.

I understand the requirement to disable charge, but why does it also prevent the ability to discharge?

Thanks in advance.

Rob.

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I noticed a weird behaviour in my 3 phase system - 3x Multiplus, 6x Pylontech US3000C, Cerbo. with hybrid setup with grid connection - grid feed in is turned off with grid feed target 0. It's very obvious during night time, where there very little load.

What happens is that few times within an hour, there's occasinal charge going to battery from the grid. It's not much, couple hundreds of W there and there. Battery at that time was around 65%. I log data from TCP Modbus every 5s to my app where I have some charts, I double checked CSV file from VRM portal.

I put screenshots into a single file. Charts are from one hour logging during night. From top: Battery Power (W), L1, L2, L3., down at the bottom are values from VRM CSV file, you can see the load is quite low and constant, but the system works on battery and then from time to time it just acts weird.

Can someone please explain that or give me suggestings how to prevent this?

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Hi all,

I have a Multiplus ll setup for ESS. It has been working fine for about a year. .

For some reason it has recently taken to randomly exporting battery power back to the grid, at full power!

As far as I’m aware, nothing has been adjusted. The only reason it came to light is I happened to look at VRM when it was happening.

I decided to monitor it with a Shelly EM clamped on the incoming mains feed - set up to alert me when there was an excessive export to grid.

I started getting alerts multiple times a day.

Turning the system on or off doesn’t rectify the fault. The only thing I can do remotely is go to advanced settings & reset the system.

All I can do for now is leave the system in charger only mode & switch it to On at night, when it doesn’t appear do it.

I have 600Ah of prismatic cells, controlled by an electrodacus BMS and an ET112 on the incoming mains feed.

Any advice would be very welcome, as I had become used to having a system that was pretty much fit & forget which has now become a daily chore of checking, switching & resetting - particularly on sunny days.

Thanks in advance,

Rob

I am trying a way to better utilize my battery. It turns out that limiting inverter power during the night, allows me to keep the battery from overloading and switching to sustain mode.

So, question is, is there a way to set up an automatic schedule to enable and disable inverter power?

Bonjour, je viens de terminer il y a 15 jours mon installation comme suit : 1 Multiplus 48/8000, 1 cerbo, 1 string 2X540w avec mppt 100/30, 1 string sur RS450/100 de 7X540 W. Tout fonctionne au top, sauf que c'est fait 2 fois que sur le Cerbo je perd ESS, il marque que je n'ai pas d'ESS ?. Pourtant tout fonctionne. Avez-vous une idée ? Merci

Hello,

I am a newbie so the question might be silly but I am very curious and my dealer isn't helpful much :).

I got the FV setup over 2 years ago but I would swear the behavior was different back then and it started just recently (could have it been an update of the firmware which the dealer didn't tell me about?).

I noticed that even though the battery has enough capacity left (e.g. on the screenshot it's at 100% and SoC is set to 60%) and the house requires more power, it's taken from the grid instead of the battery as can be seen on the screenshot.

This isn't desired behavior in my use case due to different energy tariffs during the day. I would much rather take all energy from the battery instead of the grid to save more money.

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Is this normal behavior? Or is there a way to change some settings so that the power is taken primarily from PV and the battery and only if that's not good enough then it's taken from the grid?

Very much appreciate any input here, it's driving me crazy :).

Thank you and have a great day.

Roman

Hi,

I have a ESS system with the following:

1) EM24 Energy Meter as Grid meter

2) 2x ET340 energy meter connected on input of Multi to measure None-essential load.

3) 3x Multiplus II 10k configured for three phase

4) MPPT RS450/200

5) Fronius Symo 15.0-3

6) 60kWh BYD LVFlex 5.0 batteries.

7) Cerbo GX

Initial the grid energy meter was a ET340, Victron however recommends that this should be the EM24. After changing the Grid meter from ET340 to EM24, the system started to export power from the battery into the grid at close to 20kW although export limitation was set to 5kW. To my understanding the ESS setup should never export from the batteries into the grid. Current settings below.

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Currently the only option to stabilize the system was to set the grid metering point to Multi and not external meter - as per above screenshot. (or re-install the initial ET340 energy meter).

I have an MP2GX, after the consumer unit, using AC in only. There is no solar PV, and it is simply being used for ESS battery storage and self consumption (charging from mains overnight):

• The ET112 is connected to the USB socket on the MP2GX but it is not detected in meters.
• The green power light on the ET112 is on but it is not flashing (indicating no comms).
• The USB plug initially flashes red and a couple of green flashes and then stays solid red.
• There are no extensions to the cable, it is the standard Victron cable
• I have tried connecting with and without ferrules and have tried shortening the length of he cable and neither has made a difference i.e. I am sure the connection is good, with orange, yellow, black to terminals 4/5/6 respectively.
• I have also tried connecting the ET112 to the laptop and using the CG software but the ET112 is not detected there either.
• I have noticed that the USB plug on the cable gets very hot (not sure if this is normal or not for this cable).

My working assumption for now is that I either have a faulty meter or a faulty cable and will need to investigate further. What I want to understand is the impact this might have on ESS functionality if no meter is detected within the MP2GX. At the moment my batteries will charge but they will not discharge. From the ESS manual (4.3.2), it states that I must have an external meter to avoid having to connect loads to AC-out (I am just using the AC-in bidirectional). All other ESS and Pylontech settings have been entered correctly in VEConfigure and remote config of MP2GX.

Questions:

1. My assumption is that the batteries will not discharge because the ET112 is not detected and there are no loads are present on the AC outs - is this assumption correct?
2. The manual is not clear whether the required external "meter" to discharge via AC-in can just be a CT clamp, rather than the ET112. Can I use a CT with ESS and then charge/discharge with AC-in only?

Sorry for long post but I am just looking for options to track back the problem i.e. is the fact the meter is not found the likely reason why the batteries would not discharge and, if so, I might first try a CT (cheapest if viable), then try a new USB to RS485 cable, then try a new ET112 etc. Thanks in advance for any help.

Ma configuration est composée d'un Multiplus II, d'un Cerbo GX et 3 Pylontech US2000C en mode ESS avec BatteryLife. J'ai configuré une "Charge programmée de 23h00 à 7h00 ou 80%" pour ne pas utiliser les batteries pendant les heures creuses. Et je pensais avoir compris que la décharge est désactivée lors d'une fenêtre de recharge planifiée. Or, il se trouve que j'observe bien un état de "Décharge" des batteries avant la fin de la "Charge programmée".

Auriez-vous s'il vous plaît une idée de ce que je n'ai pas compris ?

I have a system with 3 Multiplus II (48/3000) configured as a 3 phase system.

I have only connected to AC in and left the AC out unused.

I use this system to buy energy when dynamic prices are low and sell energy when prices are high. In these situations I always want to use three phases (3 x 1,5 kW = 4,5 kW)
Sometimes I want it to maintain "zero grid feedin" and in the future I will use this often because the prices for re-delivery will go down.

I cab reach this by measuring the power at my smart gridmeter and correct the feed power of my ess. But when the actual use of my home is low (for instance 200W) then the system is producing 210W with 3 inverters. Each Multiplus produces then 70 W with a very bad efficiency.

My question is: is it possible in this situation to switch two Multiplus "off" so that this 210 W will be produced by one Multiplus.

Thanks in advance.

The Multiplus should switch of the charger when Charge Current Limit (CCL) is 0 and should switch of the inverter when Discharge Current Limit (DCL) is zero, to really ensure, that there is not forbidden charging or discharging.

Currently Mulitiplus is still charging and discharging inspite of zero limits so driving a battery into overvoltage or draining a battery which already signalled discharge limit zero.

There is an issue on githib and also code which seems to solve the problem, but it has not been integrated: https://github.com/victronenergy/venus/issues/736

Also the Multiplus II is not behaving like it is documented in https://www.victronenergy.com/live/ess:ess_mode_2_and_3#running_software_on_the_ccgx_and_using_dbus_paths

It is not possible to disable charging via Modbus register 38.

I have a 10KVA Quattro with 3kW DC coupled PV, 10kW AC Coupled PV and 16.8kWh pylontech battery storage. I'm also with Octopus agile here in the UK, so the price for export sometimes goes up to 64ppkWh exported - I want to take advantage of this! I'm after a way to discharge my batteries on demand - preferably using a bit of python to continually monitor the Octopus agile API. Is this timed discharging possible?