All Questions in Victron Community

Just installed bms v2. It will not allow the possibility to switch on multiplus 3000 using cerbox or vrm. It did work for a few days but now not possible.

Latest firm wares installed on all items

Should the bms assistant be installed?

I have tried with it removed and installed

Message on cerbox screen says not possible to switch on when bms is installled.

Any suggestions greatly appreciated.

if i have two multiplus-II 3000kV [120VAC] set up in parallel [for a split-phase 120/240] and they are connected via the VE.bus. do i need one or two smart dongles?

as a secondary question does victron have or planning on making a virtual assembly simulator. something that lets you drag and drop components on to a 'work area' and wire them up to see how/if they will work together? that would be able to answer a lot of the questions brought up on this forum

15kVA 3 phase 5kVA multis on v495

CCGX v 2.92

2 x Blue Nova 8kWh + 1 x Blue Nova 4kWh (stable, believe it or not!) Each wired to DC bus.

Virtually offgrid as grid is never present in the day.

Issue takes place in daytime only

System shuts down randomly, after 5 to 10secs it boots up again after throwing #1 device switched off error.

I checked all comms cables with cable tester, no problems

I checked VRM

Loads were half capacity max at any time even hours before the situation, but generally loads were 450W on the Phase that appears to be the one switching off - phase 2 (the middle inverter flashes a light sequence, where the other 2 do not)

Phase 2 gave an overload warning moments before first switch off, power was never higher than 500W at the time and hours in the run up to the issue.

There's no abnormal temperature going on either.

Am totally lost as to what is causing it. System today switched off 8 times in space of 3½ hours.

Help would be much appreciated..

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

I have a smart grid meter with DSMR v5 so it transmit a p1 telegram every second. I'd like to use this data as grid meter in ESS. In my understanding this is even more accurate then an ET340 which has a refresh rate of 2 seconds.

I'm thinking of the following solution:

• I found a p1 to RS485 converter P1MB - P1 to Modbus converter | Xemex
• After converting I could use the Victron Zigbee <-> RS485 bridge to transmit over the air
• Connect the other end of the Zigbee bridge to my Cerbo.

What do you guys think? Is this feasible?

I have 12V lead battery and regular alternator on my boat. I installed Orion TR smart 12/24 to charge my LiFePo4 24V/50Ah battery, The problem is that output voltage is around 20V while it se to be 28,2V. I have tried charger mode and power supply, but the result is the same. Obviously my 24V battery is not charging as voltage is too low.

While two of my three SmartSolar 100/30s (A & B) stay in Bulk all day (at this time of year), the third (C) goes into Absorption just before noon and then into Float roughly 2.5 hours later. Consequently my batteries never get beyond 88% charged. (If I disable the inputs to A and B, C remains in Bulk all day.)

SmartSolars A and B are each connected to 2 * 135w panels in series; C is connected to 2 * 170w panels also in series. The battery bank is 4 * Lifeline 125Ah AGMs in parallel.

All three SmartSolars have the latest firmware (v1.61) and the same custom profile:

Absorption voltage: 14.3 (per Lifeline’s recommendation)

Float voltage: 13.3 (per Lifeline’s recommendation)

Adaptive absorption time: ON

Maximum absorption time: 6hrs

Re-bulk voltrage offset: -0.4v

Tail current: 0.1A

Expert mode: OFF

Questions

1. Can anyone explain why C is going to Absorption while A and B remain in Bulk and what can I do to stop C going to Float until the batteries are fully charged?
2. Would setting up the SmartSolars in a VE.Smart Network so that their charging is synchronised help? If so, can I do this without a Smart Battery Sense or BMV in the network?

Hi, when installing a Multiplus 12/1600/70, does it need DC grounding from chassis to DC negative? It's a fixed UPS installation, so ground is already provided by grid AC in.

I can't find anywhere in the manual for the multiplus 1600va, where it is mentioned if and how DC grounding should be done. And the circled information for what i assume is the chassis ground lug, seems rather strange, I actually don't understand exactly what it means.
What is "chassis on input/output ground terminals" ?

I assume it means that chassis is connected to input/output ground and should have permanent "uninterruptable" ground connection? Which then in my case is already provided by fixed AC in.

[image]

This example shows DC grounding.

[image]

Hello,

It is recommended in the ET112 manual to use an RS485 to USB cable. This is what I'm going to do to be Ok.

But I read at the bottom of page 4 (pdf): "The red, green and brown wire coming out of the USB to RS485 cable are not used. Note: You can wire on a RJ45 plug which can plug into the front of either RJ45 socket of the Energy meter, it has the same pin out. "

It is understood that it is to lengthen the cable.

I'm curious and my question is in two parts:

- what are the two RJ45 sockets on the front of the ET112 for?

(Matthis replied in another post that these are not ethernet sockets).

- can we connect an ET112 and a Cerbo GX in RJ45 to RJ45 (Cerbo's BMS-Can socket)?

Thank you in advance for your answers which may help other people.

Kind regards

I have 2 charge controllers, one is 100/50 and the other is 150/60. Can I run and combine 6awg wire from both to a 100a breaker and then run a 1/0 wire from the breaker to the lynx distributor with a 125a fuse? OR do they have to remain separate? Also does a sterling b2b charger have to attach to the lynx distributor or does it really only have to connect to the house battery on the back end.

Hi,

I have read as much as possible through the other threads on this subject which means no realtime data on the VRM dashboard. I have not found a solution so far that works for me.

Please can anyone explain what would cause disabling of the data link and the subsequent warning message?

The remote console data seems to be always realtime, so there is obviously realtime communication between the Cerbo and the network so where is the fault to be looked for? It is the same problem whether I open the VRM Portal in Chrome, Edge (Windows 10 laptop) or Android on my phone.

Thanks,

Hi

Is the SmartSolar MPPT 100/30 able to deal with a LiFePo 24V/200Ah battery pack ?
Battery Pack has integrated BMS 8S 200A (also RS485/CAN)
Plan to connect 2 x 395Wp (44.7V) PV panels in series connection.

appreciate feedback

best regards,

I have an offgrid victron system (mains is turned off unless battery state of charge drops below 25%) with 3 Smart MPPT chargecontrollers, a cerbo GX, 2 Blue nova battery banks with total capacity of 45kwh and a 15kw Quattro inverter.

Around once every 2 - 3 weeks, the inverter would switch off and turn the power back on around 90 seconds later.

Today I was close when it happened and I had a look at all the components while it happened. Both battery banks were above 90% SoC. Loads on the system was below 1kw. All three charge controllers was on and charging in bulk mode.

The inverter's relay clicked and the power went out. All three charge controllers continued charging the banks and everything appeared to be working as normal. Around 90 seconds later, the inverter's relay re-engaged and the power came on again. It was almost as if the inverter rebooted itself.

There are no error messages in the logs, the cerbo remained on during this time and doesn't show anything out of the ordinary. Is this normal?

We have a Fronius Primo 8.2 fed by approx 5kw of solar, coupled to a microgrid consisting of a 5kva Multiplus II, 1.3kw solar panels and eight 135Ah 12v AGM batteries. The Primo is set to MG50 and the Multiplus has been configured as a microgrid. We used this set up to successfully charge our EV for the first time two days ago. Everything worked, with the Primo generating 4-4.5kw most of the time, and the smaller solar system that feeds the battery bank via an MPPT picking up the slack to supply most of what the charger needed. The car wound down charging gradually, and presumably as whatever slight deficit there was in the battery bank was topped up, the Primo gracefully throttled itself, with the lights on the Multiplus changing from bulk, to absorption, to float, and the display on the Primo showing 0w in the absence of all loads. What more could we want? The following day we wanted to use our set up to run a 1.5kw transfer pump for an extended period. When we switched the Primo on the batteries were already full, but the Primo began hammering them with around 1800w, and the Multiplus showed bulk charging. The batteries began making a bubbling, sizzling sound – not good at all! Why didn’t the Multiplus tell the Primo via frequency shifting that it didn’t need to be pumping juice into the batteries? We had made two small changes via VEconfigure after our successful EV charging session, but can’t see how they relate to this sudden departure from proper functioning. 1. We raised the battery voltage at which the Multiplus shuts down and re-starts after a shutdown, to offer the batteries better protection. 2. The battery type was unspecified, so we changed that to AGM/Gel. After the Primo decided to boil the batteries we made one further change, altering the rate at which the Primo can charge the batteries from 70amps down to 10amps. This made no difference to its desire to overcharge the batteries, but at least the reading it gave was a bit lower, at around 800w. We weren’t able to use the Primo for the pump today, and had to rely on the smaller solar system attached to the Multiplus instead. We are stumped. Can anyone please shed some light?

One further question, if I may: Is there any other reason for the 1.0 rule than to protect against voltage spikes in the event a load that has been consuming the PV yield is suddenly removed and the Multiplus is not rated to accept that yield? If such sudden events could be managed to give the Multiplus time to respond, would it be viable to have, say, an 8kw solar array behind the Primo?

All help much appreciated.