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ev charger only grid use

Hello Victron Community,


I am new to the forum and would like to build my own ess system from victron with a multiplus 2 and pylontech batteries.


my question is i have an ev from my employer that i would like it to not use the batteries. I get paid the kw/h price immediately and the car consumes 60kw per day. I can't put that much solar panel on my house ;). therefore want to use the ess system only for my own consumption. is it possible to use a 2nd energy meter for only the charging station, which calculates the difference so that charging only takes place via the grid.


I would like to hear what you think about it, I can't really find a solution on the internet and whether it is possible via ess from victron


Kind regards


Menno van Ninhuijs from the Netherlands


p.s. charging station is an Alfen eve with load balancing via P1 port on the grid meter

mvanninhuys asked
Tibor Kocsis answered ·

2 Answers

ESS Mode - With or Without BatteryLife

Hi,

I have a Multiplus II with Pylontech batteries (1 x US2000 and 1 x US3000) and MPPT with solar

I am struggling to find out which mode should be used. It is currently configured with BatteryLife but I have seen some users saying it should be configured without BatteryLife?

Can anyone confirm which option should be used?

Riaad Abdulla asked
cramik edited ·

5 Answers

Solar Charger 100/20 interrupts charging


Hey,

I bought 2 mppts 100/20 and they are running in an ESS System. The PV Panels are directed nearly in the same direction, but sometimes they reduce the output to 0W for a while... (Left image at around 13:30). Second mppt on the right working without problem at this time.

[image]


[image]

I don't get any errors anywhere and the battery voltage seems to be good, so I don't get why this is happening. Both mppts are doning this, but not at the same time, and only about 2 times a week for about 30-60mins.

Thanks for any hint.


Cracker F asked
Cracker F commented ·

1 Answer

Kostal plugin leads to incorrect VRM dashboard (rounds to full kWh)

Hi,

We're using a Kostal Piko 7.5 with the plugin (https://github.com/schenlap/venus_kostal_pico), which works great locally. I set the interval to 5 seconds for polling the Piko.

But, in the VRM portal, it looks like only rounded kWh values arrive from the Piko, which leads to wrong production and wrong consumption values.

[image]

This is the setup (single phase ESS with EM24 as grid meter, 3 phase Piko and grid, MultiPlus II connected to L1 of AC input).

[image]

I'm not sure if I missed something in the config of the plugin?

Thanks for any ideas and hints!

ips-ad asked
gnagflow answered ·

1 Answer

ESS Inverter response too slow - tripping utility meter

Hello Community,

Our company is struggling with a number of installations in the Tshwane (Pretoria) region of South Africa. The municipality (utility provider) has rolled out the installation of Conlog meters. The majority of these meters are overly sensitive to reverse energy detection. One of the meter models is the Conlog BEC42X (Single Phase).

Many of our installations consist of an ESS setup like the following: MultiPlus II 5kVA, BlueSolar MPPT Charge Controller, Color Control GX, Carlo Gavazzi Energy Meter, BMV700 and a Lithium Battery.

Many of these installations, in the Tshwane area, are experiencing frequent tripping of the Conlog utility meter.

Some forums have indicated that these meters are tripping at a point as low as 20W over 15 seconds - or some 300 Joules of reverse (export) energy detected. This is incredibly sensitive and clearly the root problem. However, this is very difficult to resolve with the municipality (utility provider) and they are mostly unwilling to assist.

We have had to resort to setting the grid set point significantly higher than desired, sometimes around 300W and have had to limit inverter power, in some instances to as low as 750W. With these restrictions placed on the system, we are mostly unable to process (store and discharge) all of the solar energy available from the solar array resulting in compromised economic performance.

What can we do to improve the control of export power to the utility?

It is inevitable that some export energy will be supplied to the utility in a grid-connected ESS system, but one observation that we have made is that the MultiPlus & Quattro inverters appear to react quite slowly AFTER a large load is switched off - this observation comes from the Color Control display panel where we can see the grid import/export as reported by the Carlo Gavazzi Energy meter, as well as the amount of power being discharged by the battery, as reported by the BMV700.

Once a large load is dropped, can the inverter not reduce it's power faster to avoid overshoot and subsequent export energy being supplied to the utility?

From this link, we see that the response time of ESS has been limited to 400W per second as per ESS version 162... but now we need a work around?

This thread comments on a similar aspect: https://community.victronenergy.com/questions/51697/victron-ess-et112-slow-response.html


After reading the above thread, can we not adjust the refresh rate and baud rate for the energy meter (Carlo Gavazzi) to aid the situation in swiftly recognizing the change in the grid import/export condition?

Alternatively, is the 100A:50mA Current Transformer a temporary solution for MultiPlus II ESS installations?


If this cannot be achieved with the ESS assistant, is there a combination of assistants that will allow us to operate in a similar fashion to ESS while overcoming the issues presented by the hard-coded rate limiting?


Thanks in advance for your input and suggestions.


Nicholas Herbst asked
jay123 commented ·

4 Answers

Any Changelog Information for ESS Assistant ID 0184

Hey,

I have recently reconfigured some ESS Systems because of some changes. In VE Configure it wants me to update my ESS Assisant from ID 017E to 0184. However the assistants changelog in Victron Professional ends at 017E.

I also want to update the Systems to v.500 while I'm on it, but I am not sure whether I will run into problems without the Changelog?


Does anyone maybe from Victron knows where to get the changelog and / or if I run into problems with Firmware Version v.500 and 017E Assistant?

There was a problem posted here 10 days ago where someone couldn't get ESS running again after Updating to v.500

steegergrid asked
nickdb commented ·

3 Answers

ESS exports excess solar to grid instead of charging Pylontech battery

This a re-post of a question from several days ago, but hopefully with much better focus and clarity - hope that's OK.

My ESS consists of Multi 2 48/10000, 4x Pylontech US5000 with an ac coupled PV array and Solaredge inverter.

After several days of monitoring it seems that the core issue I am concerned about is that the Pylontech batteries do not start to charge until the excess PV power reaches somewhere in excess of 200W. Thus the situation illustrated below can in pratice exist all day exporting all excess PV to the grid. Even ay circa 1kWh that is a loss of valuable energy at this latitude! I know the excess illustrated is only 73W but I have seen it sit consistently nearer 200W, I just don't have a screenshot of that.

[image]

In theory I believe that ALL PV excess after powering the loads should charge the batteries which here are sitting at the set minimum SOC of 85%. That is not happening.

Today we have some usable sunshine, and the batteries are charging, but once again they only started to do so once the excess exceeded ~200W. It is as if there is some sort of minimum that must be exceeded to shift the batteries from 'Idle' to 'Charge'. I have contacted Pylontech, but surprise, surprise - no response. I can see nothing under settings that I can change that would influence this. Has anyone any ideas as to how this can be improved?

I also observe that the system seems very slow to respond to changing solar gain consequent upon the clouds that decorate the sky in the north of Scotland. Is this to be expected? When the cloud arrives the batteries keep charging at the same rate drawing power from the grid before the grid power drops away towards zero. When the cloud passes the reverse happens as illustrated below.

[image]

I presume that simply reflects how the multiplus algorithms work, but it is a shame it can't be more responsive.

I hope this doesn't sound overly negative. This is my second Victron system. Overall I like the gear, and love the documentation and support provided by Victron and the forum. I just like to understand how systems work and optimise them as best I can.

I do hope there is someone who can cast light on this. I could find no similar reference in the forum.

Thanks to all.

David

assyntdavid asked
assyntdavid answered ·

14 Answers

ESS or MP2 reducing discharge power at 30% and 20%

Hi all,

I am a bit confused because my MP2 reduces the discharge current at 30% and then again at 20%. I cant recall to have configured something like this.

Environment is MP2 48/5000 + Venus OS + 16s DIY System with JK BMS.

Can anyone point me to a possible source?

dominik-feser asked
nickdb commented ·

2 Answers

Any way to install ESS Assistants without VE Configure?

Not a Windows guy (100% Mac based) but would like to install an ESS Assistant. I have a Multiplus II, MK3-USB and a Cerbo. Is there a way?

Thx

kamflyer asked
jdzl answered ·

3 Answers

MP2, ESS Can not discharge below 19% SOC

Hallo All :)

I'm using the Multiplus II + Cerbo + 3x SOK48V100Ah (16x3.2V LiFePo4) in an ESS setup with AC coupled PV. Batteries are weeks old. Using ESS without battery live only.

I noticed that when I set the lower SOC limit (that triggers ESS#1) below 20%, this limit is never reached. At 17%(with load)-19%(without load) the Multiplus starts charging from grid will 3000W for one or seconds and repeats this after some seconds. Voltage is around 51.2V - 51.8V at that time.

I tried to find a setting in VE.Config & Cerbo without luck. Sustain voltage is set to 48V. Dynamic shutdown is set flat to 48V. Nowhere in the system is this voltage mentioned. The BMS (connected via CAN) anounces no discharge limit, no notification in the Cerbo menu.

When I set the SOC limit to 20%, the ESS#1 is triggered and the battery idles as expected.

I tried to find similar questions in the forum, but only got this one:

https://community.victronenergy.com/questions/109156/ess-low-soc-battery-not-idle.html

which might be a similar problem, but at much lower SOC. I can not discharge that deep.

I even tried to set the grid setpoint above zero, zero, and even at -3500, but with no luck. At about 17% the discharge is interrupted with frequent short charge cycles.

I know that this is not a serious problem, but it really bothers me that I don't understand why this happens.

Sven Ewald asked

0 Answers

Victron ESS + ET112 = slow response

Hi,

Recently I've installed ET112 grid meter on my system (which was using CT sensor previously) and I've noticed that the Multi is very slow on response to load. Currently my system looks like this:

[image]

The grid set point is set to -10W. The multi needs a good 15-18 seconds to stabilize after large load kicks in and another approx 15s to stabilize after load drops off. Check the video from VenusGX (the load is switched on at about 16s of the clip and switched of at 43s of the clip):

Is that how it should be? The difference in the load is just about 1.4kW, why is it taking so long to handle that?

Previously I was using CT Sensor extended with Cat5e cable to over 25m long, the system looked like this:

[image]

The response to load was pretty much instant. I've recorder video using the same load as on the previous one (load switched on at about 10s and switched off at 23s of the video):

The system need seconds to stabilize

Also you can see a clear difference on the Grid use graph from VRM portal:

[image]

[image]

As you can see, with CT sensor the system is very close to grid set point, with ET112 grid meter it is way off and hardly ever stay close to set point. The situation is even worst during cloudy day when PV power is fluctuating (you cen see it on my other youtube video).

Is it normal behavior? It looks like Multi can handle this load easily, the problem seems to be in the feedback from the grid meter (or algorithm when ET112 is in use). Is there anything I can do to improve this reaction time??? Please advice.

Kind Regards

mysik asked
1234enough commented ·

16 Answers

How does a Multiplus II behave if no assistant is installed ?

I have red many Victron documents, watched webinars and also searched through the Victron Community but was not able to clearly figure out how a Multiplus II behaves if no assistent is installed. Would be great if someone could provide some informations.

Scenario 1:
- ACin of the Multi connected to the grid, no feed back to the grid
- Critical loads connected to ACout1
- One Pylontech US2000C and a Cerbo GX
- no PV, no MPPT

a) Will the Multi keep the battery always 100% charged?
b) Will the load on ACout1 fed from ACin or from the inverter by discharging the battery?
c) In case of a grid loss, will the load on ACout1 fed by the inverter and battery?

Scenario 2:
- Same as scenario 1 but additionall with PV and MPPT

a) Will the battery primarily charged by the MPPT and in case there is not enough sun via ACin?
b) Will the load on ACout1 primarily fed by the inverter by discharging the battery and in case there is not enough sun via ACin?

Actually I would like to set up a self-consumption system with backup capability and the possibility to charge the battery with an generator in case of a long lasting loss of grid. For this an ESS seems to be the right choice. But Victron says, that an ESS should not be used in case of "Off-grid systems - either with or without generator". That surprises me because a long lasting grid loss leads to a kind of "Off-grid system".

Thomas asked
Thomas commented ·

1 Answer

Intentional islanding
Although my idea of solar installation has always been off-grid, having grid, suplier installed the ESS assistant for my AC-coupling + DC-coupling system. I am not at all happy with this configuration and I am reluctant to be hooked to the grid. I understand the grid as the last resort, as if it were a generator. In other inverters such as the Sunny Island, the configuration in this sense is very intuitive, but at Victron I am reading dozens of documents, experts opinions and moralists that do not clarify the matter as I think it deserves.I would like to know which assistant or assistants can be configured to work in isolation with an ac-coupling + dc-coupling, using the grid as generator.I found a post where they recommend the following:
- AC-Coupled
PV Inverter Assistant + General Flag and Generator Start/Stop
-DC-Coupled
Virtual switch - Dedicated ignore AC InputHonestly, if I'm asking, it's basically due to my ignorance and I totally don't know how these combinations work.

All the best


urantia asked
Alexandra commented ·

2 Answers

Mppt problem in ESS

dear experts! in my system the problem is with two mppts (150/100 and 150/70) System composition: easy solar 5000/48 mppt 150/70 mppt 150/100 (inside easy solar) solar panels 2.5 kw west and 2.5 kw east. battery Dyness power depot H5 100ah The system is configured as ESS. The problem is that a very small generation. a lot of sun. Now I found that both mppts see different voltages on the battery (I'm attaching a photo).


for two months, the maximum that I have seen is 1.5 kW from both controllers at the peak, although the SOC battery is 30% and there is a load. What can limit generation? Thanks

kuban-invertor asked
hardy-tuner answered ·

1 Answer

ESS system is pushing back to the grid after adding a second MP2

Good day,

I had an ess installation working perfectly fine. It was set to 10W grid set point and we had no issues.

We now added a 2nd MP2 in parallel to the same system.

When doing that we had to clear all ESS assistants on the BUS and then re-configure them.


According to the docs we had to go and add ESS assistant onto each inverter on the system. This we did.

However now that the 2nd inverter is installed and up and running I have noticed that we are now pushing ~370W back into the grid, this is even at night when there is no Solar and the battery is low. This is obviously not an ideal situation.


[image]



I have tried increasing the grid set point to 100W and that didnt help either?

What settings could I have wrong here?

dylan-hyslop asked
nickdb answered ·

1 Answer

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