ESS

Hi all,

I have a multiplus-II 48 which is currently operating as a backup for when grid fails, it is in a house.

The mains is split at an ATS-Automatic transfer switch, the multiplus-II is installed at a remote shed.

When mains fails the ATS switches to the multiplus-II but with a 16A limit, in normal operation the house load does not go through the multiplus-II because it is limited to 16A and 40A is peak load. In backup mode (mains has failed) the power to the remote location is off the house is on.

I am looking at adding PV via the 250/60 MPPT in to the multiplus-II.

I plan to modify the ATS to provide unswitched power at all times to the remote location, Install venus/colour gx at the remote position and AC monitoring at the origin (60m apart)

Q1, Can I use cat5/6/7 for comms between the GX & AC sensor with the victron usb adaptor at the GX

Q2, Given in standard operation the loads do not go through the multiplus-II at all will it just backfeed PV & Battery capacity to the local grid up to 16A? (The AC 1 & 2 outputs are basically disconnected in standard operation hence forward feeding is not possible)

Q3, Can I get standard RS232 (not TTL) out of the GX?

Q4, How do I prevent back-feeding on mains fail? I fear the main contactor will stay energised as it will sense the voltage from the Multiplus-II which in turn will prevent switch over to backup.

Thanks

Martyn

@mvader (Victron Energy Staff)

Hi

How can I display the critical loads and ac loads like in the pic below (pic from another user question)

I have Multi 24:3000 don’t have ess installed yet

I can not select grid code AUS/NZ grid code and have lom device,how can I select au/nz grid code or do I have to select other not complaint

Thanks

Hello,

I've got a ESS with 3 BMZ batteries (364Ah), MultiPlus 3000/48V, Venus, ET340 together with SMA Tripower 20.
Latest firmware on MultiPlus and Venus.
ESS Assistant on MultiPlus acc documentation for BMZ.
System is charging with PV surplus but not discharging, see below.

I tried a lot already incl. reconfiguring Multi, exchanging the Venus with a CC, but no change.

Does anyone has an idea?

Thanks, Stefan

Hi

First pic is with grid connected. Second pic is with grid breakers switched off.

How can i change so it prioritizes solar over the grid?

3 Quattro 15 kva

4 MPPT 250/100

1 CCGX

ESS with Battery Life optimized

When AC load is less than PV, such that the surplus is correctly directed to charging, why isnt "bulk" shown ?

At the point of transition (from discharge to charge) "bulk" is correctly displayed, but only briefly displayed - as the PV surplus, and therefore the charge current increases "discharging" is displayed, rather than bulk.

If this is expected behaviour it seems rather anti logic. This screencap illustrates.

Community assistant requested.

I am looking for a assistant that will action a relay, if the Hz raises to a set figure

Ie I have a grid Tie inverter connected to the AC1 out of a multiplus 48/5000 and I am wanting to export power if my batteries are full and before the Grid tie inverter shuts down, I want to turn on AC1 In so that power is then exported. instead of being lost

I have currently got the AC1 in to be ignored and am using gen autostart to turn the AC1 on if the battery voltage drops to say 50v and off again when it raises to 53v

this works well and the AC1 in will charge the batteries if we get a cloudy day but not fill them unless the solar comes in etc

So then if the battery is full and all loads are covered then the grid tie is going to be turned off or down, I am looking for a assistant that will turn on AC1 if hz gets to say 51 hz then off again after a set time period say 1 to 6 hrs so that I can export the excess power back to the local grid.

basically I am off grid but as we are part of a community power grid it would be nice to send back unused power so that others can use it.

No point in wasting it

I tried negative battery amps in the autostart but a neg number is not allowed

even tried using quite time and setting the voltage but that wont work as well

other suggestion welcome

willing to contribute to the cost if someone can make one

Thanks

Can I consider adding a small 2 KVA single phase ESS ( 1 KW PV) to ACout 2 of a large 15 KVA 3 Phase ESS system( 11 KWp PV) . Doing this can potentially allow me to add some critical loads to AC OuT 2 but still maintain loading capacity of a 15 KVA ( limited right now by the size of battery 10 KWH BYD pro)

The 2 KVA single phase will run its own 10 KWH lithium battery ( from a different manufacturer)

Or is it better to just run the system in Ignore AC mode and forgo the efficiency gains as the 1 KWp panels will supply a peak 250 Watt load

What determines ESS #5 rate of recharge rate in a grid parallel system ?

MPII + MPPT

This is a new installation and the first time I have done a PV system. and its been live two days now

• I have the PV 5000w solar inverter that will turn off by frequency at 53 Hz (this is changeable)
• The PV is connected to AC1 out
• Battery bank is Lithium Phosphate 48 Volts 10Kw
• Multiplus 48/5000-70
• Panel size 4.5Kw
• Grid connected to AC1 in

Problems I am having

1. I have turned off export to grid but export is still occurring
2. I have set battery charge limit to 1000w but I only want this to be if drawn from the grid if possible.
3. I have said yes to PV power in ESS and changed the frequ to off at 53hz
4. I cant see the Hz changing if I have excess PV power nor does the battery charge rate increase as all excess power is being exported, (even with export to grid set to off

Other bits I would like to do

I only want to charge or use all the solar during the day to charge the batteries and override the max charge rate rate if there is PV power available as the day progresses

otherwise everything is working well

More testing twomorrow

Hi,

In our solution we ended up tell the Victron to not use the grid at 6% SoC. This started a battery discharge (as expected) and then lead to the SoC dropping to 5%. At this point ESS killed the output and turned the inverter off - is this normal ? We still have a lot of energy left at 5% ? Perhaps passthru would be better ?

Cheers,

Pieter

Hi. I have just (unsuccessfully) tried to add another multiplus 24/1600 to my system to have 2 of them to increase charge current to 70A. The unit I bought had the old microprocessor so it won't work with ESS and won't work my existing unit which has the new cpu.

I think its probably easier to just replace the multiplus with a 24/3000 unit which has a 70A charging function and sell both of the 24/1600 units for around £400 each (hopefully).

BUT I've noticed that the multiGRID 24/3000 is about £250 cheaper than the multiplus 24/3000. Its not designed for use in the UK which has lower reg requirements, but according to the datasheet it also supports the UK regs. So can I just buy one of these instead and use it in the UK grid connected and save some money?

Hi guys. I've got an ESS system with CCGX and multiplus 24/1600/230V. All working fine. I've bought another exact same multiplus to use in parallel to increase my charge current. I'm trying to follow the setup guide, it says that the mutliplus unit must be setup in parallel mode first. When I try to add the VE.bus and VEbus 2 way assistants I get a warning message saying these do not need to be used in an ESS system (ESS assistant is already loaded).

Is it as simple as connecting them up together with an ethernet cable and the CCGX does the rest?

I have (or at least had, as it is in service right now) an Easy-Solar 48/5000 system. I chose the internal battery monitor of the unit as I had no dedicated monitor (like BVM 700) at hand.

I found out that the colour control keeps reporting 100% SOC as the voltage varies within wide limits, between 48 volts and 55 or so, but the SOC never changes. Is this intended behavior or is something in the setup to be changed?

Hi All,

I've been looking around for answers but can't find the specific answer to my problem. I have the Multiplus 500/48/70-100, Blue solar 150/70 connected to 4 x 183AH 12V Deka Gel batteries. The system is setup in ESS, optimised mode with battery life and a SoC of 70%. I've also set the 'limit inverter' function to a max of 3200W in the ESS setting which should be well within the power margin of the inverter. The batteries are connected with 50mm2 cables of 1.5m.

During the day there is no problem usually, but at the end of the day (close to the SoC) limit the inverter trips when using >3500W for some reason and tells me that the battery is low. First of all the inverter should not be doing anything above 3500W and should supplement battery power with grid power above this point. Secondly, the notification of the alarm tells me that the battery power is around 45V but after the system restarts again I get a reading of 49V, also in VRM.

I am wondering what the problem is. I also have a 156A DC breaker in between the battery banks which sometimes trips, meaning the inverter does draw far above 3200W which at 48V = 67A.

Hope you guys can help me out!

RS

Hi i have multiplus 24/3000 is it possible to run ess for self consumption

I don’t have a solar grid tie inverter only mppt controllers conntected

I would like to minimise the use of grid power (apart from power assist ) and maximise the use of the batteries and solar and cannot backfeed to grid in aus

Hi

Last night i started up my system after just finished the installation.

System consists of:

3 Quattro 48 volt, 15 kva in three phase configuration.

4 MPPT 250/100

1 CCGX

100 kWh Lithium batteries. Usable voltage between 38 - 49.1 volt.

1 REC BMS

I have grid power connected to each Quattro on AC1 (one phase for each Quattro). Have configured ESS assistant. Using German grid code. Battery Life optimized. Input current limit to 30A on AC1.

Everything works fine exept the inverters are not taking in any power from AC1. I depleted the batteries down to the lower limit and the inverters shut off. I must be missing some check box somewhere?

The chargers in the Quattros wont kick in either.

Have checked that all Quattros have the same settings, assistants etc.

//Ari

Dear sirs,

I done an ESS three phase installation about 1 week ago, with 3x Multigrid II 3000VA, with no loads on AC Out, on a customer site.

I keep having #11 error randomly, and overload error.

I get no support from the local dealer or the spanish support team, it has been 1 week since I emailed about this, and the only reply I got was today, a basic one, they didnt even bothered to checked the site on VRM.

Can you help please?

Is that a known Problem, of ESS in 3phase mp2/3k System without Energymeter AC-In to AC-OUT.. It was installed Nov 2018 MP2 with actual FW451 of Nov. last year. Is that already fixed in a new FW? Because we dont want send a installer for fw update to customer if that doesn't fix that.

Fronius Microgrid Mode on AC Out. There is just one Fronius inverter in System not any other Inverter or charger

CCGX FW is already last Version remote updated today.

Problem Grid show's double output..

We have an installation with many hot batteries connected in parallel.
We are experiencing the following problem with ESS "optimized (with battery life)":
The system cannot hold its dynamic SOC low-limit, it drops way below it.

Could it be that ESS has a problem with the self-discharge current of the hot batteries?

The batteries slowly self-discharge through a heater to keep themselves warm. This would explain, why we are able to run ESS successfully on other installations with fewer batteries. Too many batteries and the self-discharge current would become bigger than ESS' low charge current?

In particular, from the wiki:

6: SoC has been below SoC limit for more than 24 hours. Charging with battery with 5amps

5 amps would definitely not suffice to keep more than 3 batteries warm.

Is our assessment of the situation correct?
If yes, is there a way to adjust the #6 state's charging current?

Sincerely

Ivo Graber

Any idea why Fronius is restricting its output when the grid is missing even when soc is less than 90 %?

did I miss some setting?

with grid available, it produces on average 700 to 1200 watt to match my house load

Screenshots attached

checked following

1. Quattro frequency - exact 50.0 Hz

2. ESS debug menu - I charge = 140 amp. P charge limit = -1.0

3. PV input voltage present at Fronius terminal above V start almost 300 V