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Cerbo GX Sensor Recommendations

I'm super excited to find that Cerbo GX can monitor my batteries, solar, AND tanks. My stock KIB sensors are nearly useless, reading 2/3 full until gray water starts coming up my drain, signaling 100% full. It's pathetic.

Does anyone know what sensors I can use that will give accurate level readings and work with Cerbo GX / GX Touch? I would like fresh, gray, black, and propane sensors that work with Cerbo GX.

Will this work? Do I really need 4 sensors for just the black tank?!?

childcarepro asked
dunnp commented ·

3 Answers

Voltage Sensing Wire Connection


Multiplus 24/3000/70

For safety reasons I have connected a "de-coupler" main switch beween the batteries and the Multiplus.

The Voltage sensing wire + is connected directly to the battery bank + terminal

Now ... if I set the switch to OFF ... thus disconnecting the batteries from the Multiplus ... I still measure about 24V between the "off side" of the switch ( the cable going to the multiplus, and the ground)

I found that this stops if I disconnect the voltage sensing wire from the battery ...

Question ...

Is this O.K. ... or should I connect the voltage sensing + wire not to the battery but also "after" the mains switch ?

Greetings from Amsterdam ...


Sierk asked

0 Answers

Multigrid - stop discharging battery based on external signal ?

I still want to stop my Multigrid from discharging the LG battery, when charging my car during the day. Firstly it is not efficient to use battery power to charge another battery, but main thing is to preserve battery energy for night time when PV isn't available, to the grid suppliers either. During daytime there is plenty of PV power fed in the grid, so I am OK to use this whilst during nighttime sources are different - not PV for sure.
So is there an input (sensor) I could use for that? E.g. stop discharging by applying a certain voltage somewhere, make a short or connect a switch or whatsoever. Txs for any help

Vicky asked
Vicky edited ·

4 Answers

Is Smart Battery Sense waterprooof?

My batteries in trailer RV are in boxes but are not sealed, will see road spray when traveling in wet conditions - is the Smart Sense waterproof?

Brenneke asked
Brenneke commented ·

4 Answers

ESS System not discharging and current monitoring seems incorrect

ESS System (grid parallel) with Multi-II 5kVA (firmware 467), 3 x Pylontech batteries, EM24 energy meter (zigbee) is not discharging through AC Input to the property. The critical loads (AC Out 1) will discharge the batteries, but only if the grid is isolated (otherwise passthru). The batteries will charge from the grid when set to 'Keep Batteries Charged' but otherwise will not charge or discharge (sitting at 97%).

An AC Current Sensor is connected to Aux 1 on the Multi to monitor a wind turbine. Can't get this to work correctly either - consistently shows current where there is none. Without the assistant it still shows up. With the assistant, I get two separate lines in the Device List (ID 10 and 30). It is the latest revision Multi-II with dry contact Aux 1 so should be okay to use this rather than Temp Sense.

The data from the EM24 energy meter and Multiplus is suspicious. The voltage and power seem correct (using multimeter and clamp meter to check, turning on loads seems to show correct power) but the current is incorrect. For example both will send data along the lines 242V, 280W, 6.4A. Or 242V, 180W, 1.4A. The current does not add up.

I have checked the batteries, tested them individually and the same result, so I think the CANbus is fine. Battery parameters show 44A charge, 111A discharge limits at 7 degrees celsius, so I don't think it was a temperature cutout. Float 52V Absorption 51V.

CCGX is set Without Battery Life, Minimum discharge 30%, AC Output in Use, Grid Meter installed, Feedback enabled, no limits on inverter/charger/input power. ESS assistant set with recommended Pylontech parameters (46V cutoffs, 48V Sustain). CCGX 2.42 (can only roll back to 2.12 remotely, which is too early for reliable CANbus, so might have to try 2.40 or something at a later date via SD).

I am mostly concerned about the system not discharging to the property (AC Input) based on the EM24 data. But the AC Sensor is irritating too. Have I overlooked anything obvious or any suggestions for fault finding? My best guess is a fault with the CCGX or perhaps its firmware.

midsummerenergy asked
midsummerenergy commented ·

1 Answer

Toggle BMV-712 Smart Monitor between auxiliary AND starter battery

I have the BMV-712 Smart hooked up in my van. I have separate lines running to the positive terminals on both the auxiliary and starter batteries, but I am only seeing readings for my starter battery. How do I toggle on the app or display to view the data for my auxiliary battery?

familyvan asked
Justin Cook - Bay Marine Supply USA answered ·

3 Answers

Can Current Transformer replace Energy meter

Hi Victron Community,

I am currently setting up a grid parallel ESS with a Multiplus 2, a Venus GX and two 5KWh Tesla Modules. I already have the Current Transformer/sensor ( ) for the Multiplus but no Energy Meter ET112.

Is my understanding correct, that

1. AC-In on the multiplus is bi-directional and can import to charge the batteries and export to power loads (I do not have any loads connected to AC-Out 1 or 2.)

2. I do not need to install the Energy Meter if I have the current transformer connected to the grid connection? (see picture below)

What changes to I have to make in my VE Config and ESS controls on the Venus to tell the Multiplus/Venus that the Current sensor is supposed to measure the import/export at the grid connection? I cannot see any options here apart from the tick-box in VE Config.

Any help would be much appreciated.

Any help would be greatly appreciated. Thank you, Phil

Schematics of my setup are below (except for the "No break loads, which I do not have):


Phil Kaddy asked
mvader (Victron Energy) commented ·

3 Answers

ESS Meter for 120/240V Split Phase - ET340 AV5 or AV2?

Need a quick sanity check on the version of ET340 that supports US split phase (120v/240v).

Victron manual states that the following version is supported & for sale through them: EM24DINAV53DISX

When you look at the actual Carlo spec sheet the voltage ranges do not line up for split phase market.

AV5: 400VLL AC - 1/5 (10)A (CT connection) VLN : 160 V to 480VLN VLL : 277 V to 830VLL

AV2: 400VLLAC 10(65)A (direct connection) VLN : 113V to 265VLN VLL : 196V to 460VLL

I believe for split phase AV2 is needed - spec. sheet (linked to a reseller since the manufacture site is tough to navigate)

Accurate or am I misreading the sheet?

In addition I can find the AV5 for sale but not AV2 and I would need to use a CT sensor and AV2 appear to only support a shunt.

Anyone using the ET340 successfully in a 120/240V setup and measuring up to 65amps? If so what version and what is your setup?


Mike Stasko asked
ee21 commented ·

1 Answer

Can a BMV-712 shunt be installed on the positive side?

What is the rationale of placing the shunt resistor into the negative path of the battery? This creates two different "ground" levels.

Can the BMV-712 be used for high-side current monitoring (i.e. the shunt in series with the positive terminal of the battery)?

ttmetro asked
ttmetro answered ·

2 Answers

Charge controller not producing what it should

I have a Easysolar 5000 with lead acid batteries and I can grid feed. I am running ESS with keep batteries charged. I have set the float voltage to 54V and the float voltage on the charge controller .4V higher. I have 5.28kWp PV installed, but the PV production only goes up to roughly 3kW at 10AM and then drops to 2.5kW till the late afternoon. When I discharge the batteries a bit the PV opens up but only until the batteries are charged again. The system rarely grid feeds more than 2kW. I have tried changing the ESS setting to optimized and cycling the batteries to 95% but the solar still doesn't open up. Grid setpoint set to -5500W. Tried with and without DVCC, no success. Any suggestions?

SolarTronics asked
Paul B answered ·

1 Answer

3 ph Quattro off grid; two Fronius 3 ph; can VRM display each Fronius wattage as a separate number?

I'm finalizing the design for a 2019 project. Clients prefer if VRM can display the wattage of their first Fronius Symo inverter separately from the wattage of their second Fronius Symo. I had planned for the two Symo's to share one Data Manager 2.0 card, hence only one connection to the LAN.

Does VRM always combine the Symo wattages into only one number? What if I used a second Data Manager card so each Symo has a separate connection to the LAN?

OR: is Fronius Solar.web our best bet for seeing the solar data in more granular form?

OR: your other suggestions would be welcomed. Thanks in advance~

abrahamsolar asked
abrahamsolar commented ·

1 Answer

DVCC not compensating voltage drop


I have been trying for a while now, and I never managed to make my system compensate the voltage drop in the DC part of my system.

System is composed of:

2x MPPT 250/60 ver. 1.37

Venus device, ver. 2.23

Multiplus 3000/24/70 ver. 423

Battery bank 24V 14kwh OPzS

Section cables of 35 and 50mm2, lenghts of around 5m on MPPT to battery, 2m between battery and Inverter.

2 fuses involved along the way

Voltage drop needed to compensate in high currents: around 0.3 to 0.7V, at most.

Without DVCC, I see correct voltages monitored in both the MPPTs and the Multiplus. The Multiplus is closer to battery and with the Voltage Sensor correctly connected (confimed with multimeter).

In absorption stage, there is some voltage missing to be optimal value, and slowly rises when current drops. Only in final moments before going to float I see the voltage reach the expected 28.8V + temperature compensation.

So, I enabled DVCC + SVS, and what I see is that instead of the MPPTs rising a little the output voltage, nothing changes on system, and he only difference is that now the Multiplus reports the voltage of the MPPT instead of its own!!! Battery monitor selected is the Multiplus!

Yesterday, I switched off DVCC and added temporarily the Smart Battery Sensor, just to test. The system started to respond as expected and the MPPT immediately raised their output voltage in order to have true 28.8 + temperature compensation on the battery terminals. But I would rather use DVCC, since I have Venus device.

Any ideas of what is going on?

Thanks and regards

Elimac asked
Mark commented ·

5 Answers

Phoenix inverter compact 24/1600 SENSE terminals


I bought a second-hand unused phoenix inverter compact 24/1600. There are 2 wires coming out of the inverter that are crimped together. Inside the inverter the wires are connected on a terminal labeled SENSE. What is the purpose of the wires/terminals? I could not find any information about them in the manual. Attached are some pictures of the inverter and the wires/terminals in question.







Liberty International Sailing Club asked
Boekel answered ·

2 Answers

Voltage Sense in Multiplus when open


What is supposed to be the voltage in the V Sense terminals of a Multiplus 3000/24/70 when a is connected to battery and operating? The V Sense terminals are not connected (left open) and I see the same exact voltage as in the DC input terminals. Is this normal?

Elimac asked
Murray van Graan edited ·

1 Answer

simple solar irradiance sensor using tanklevel inputs

I took a BPW34 photodiode with 240 ohms resistor in paralell and connected that to the tank level input. tank sensor type set to 30- 240ohms. diode cathode (the slightly wider pin) should go to the odd numbered tank level input of the venus GX. the other side to the odd pin +1 number. do not short the wires to any other wires , do not connect to ground. solar sensor.jpg

basreflex asked
Pat Davitt answered ·

3 Answers

Using multiple AC current sensors


I have a customer who would like to monitor multiple small PV installations using AC current sensors. My questions are:

1. Can multiple sensors be used in 1 installation?

2. What is the max length of cable run for these?

Many thanks

Stevo07 asked
Paul B answered ·

1 Answer

Tank Sender Adapter - invert reading

Hi all,
Just wondering if there is a way to invert the level reading on the VE. Can resistive tank sender adapter. The level senders I have seem to operate the opposite way round, so when the tank is empty Victron reports it as full and when it's full, Victron reports it as empty (on Colour Control). Is there any way to sort this - if not it would be a nice little feature to add.



willhoppy asked
WKirby commented ·

3 Answers

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