ac out 2 Image

ac out 2

Multiplus II 24/3000/70 120v AC OUT2

When I turn off my Multiplus I expected the AC to pass through to AC OUT2. This is not the case. What do I need to change to make this happen?

menasco asked
menasco commented ·

1 Answer

Using Cerbo GX and Multiplus to control dump load

Victron AC System.png

Hi everyone,

I have a question about using my Cerbo GX and Multiplus II together.

I want to heat a 240v water heater as either a dump load (when battery SOC is high) OR when shore power is available to the Multiplus.

This is simple enough with just the dump load setup - I can use the relay in the Cerbo to trigger at a certain SOC to a second relay to power the heater.

What I am wondering is whether it is electrically possible to combine the 2 AC outputs of the Multiplus so that the heater is ALSO powered when shore power is available - as the second AC out on the Multiplus is active only in this case. Maybe there is another way of doing this (like if the Cerbo logic could control the relay based on AC availability too).

I have attached a simplified diagram of what I propose.

Are the 2 AC outputs perfectly synchronous?

Thanks for any advice


liam-hogan asked
Vance Mitchell commented ·

1 Answer

[Urgent] 3phase 3 quattros battery charging problem

I'm using 3 quattros with 3 phase AC inputs (phase 1 - quattro 1, phase 2 - quattro 2, phase 3 - quattro 3) and Pylontech lithium batteries. The ACin 2 terminals are used as AC input instead of ACin 1 terminals since it is a bit congested with cables on the ACin1 terminals side.

Both AC out terminals on each quattro are used to output 3 phase system. AC out 1 is powering small loads and AC out 2 is powering bigger loads. The system is designed to act as a UPS, providing power to only essential loads (AC out 1) when electricity's cut off from the grid. I followed this link: to configure the system. Now, I have two issues:

1. When the quattros are turned on and the AC input breaker is switched on, only quattro 1 appears to be drawing current from the mains whereas the other two quattros do not have any current. This means only quattro 1 is charging the batteries and the other two quattros do not charge the batteries. This is clear by the lit bulk charge LED on quattro 1 while the charging LEDs on the other two are not lit. Below are some more info about the system.

Battery capacity: 28,416Wh (3,552Wh x 8 batteries)

Quattro: Victron Quattro 48/10000/140-100/100 x 3

2. With the AC in main breaker still switched on, I measured the AC out voltages on all inverters. Apparently all AC out 1 terminals have 220V and it is fine. However, the AC out 2 terminals have only 20V. When the grid power is available, AC out 2 terminals should have 220V. Only when the grid is not available, AC out 2 should be cut off.

Could anyone please figure out how to fix these 2 issues? Thanks.

htooz15 asked
Daniël Boekel (Victron Energy Staff) answered ·

1 Answer

AC2 Output Current Rating - Multiplus 12/3000/120 and/or Multiplus II 2x120

Reading either datasheets or the manual, the auxiliary output (AC2) shows a current limit of 25A with a fuse rating of 32A. This is the output I should put my non-inverted loads on, like Air Conditioners, ovens and water heaters - which combined, easily exceed 25A. I'm suspecting this is a documentation error, where it was not changed from the 230V value. Can anyone confirm this? Can AC2 have loads up to 50A (if not 75A w/boost) connected?

svalvasori asked
svalvasori commented ·

4 Answers

AC Output 2 on EasySolar with AC Ignore set up

Hi, i use an easysolar in my motorhome and i want to use the AC ignore to charge the batterie with the solar panel in priority with the possibility to have the AC out 2 even if the AC in is ignored (enought battery capacity). And of course if the load or state trigger, activate the AC in.

I use the assitants to do this with the informations i've found on the net. This is my settings, are they correct ?







Thank you for the help !

lambish asked
lambish commented ·

3 Answers

Grid parallel load vs. AC out 2

Good-day. I am trying to understand the difference between a "grid parallel load" and a load on "AC out 2" when using a Quattro or a Multiplus in ESS mode. Clearly, the inverter does not even know there is a grid parallel load unless it is configured to do so and there is an energy meter attached to measure the power flow at the grid input. (Any guidance on how to configure these aspects would be welcome). I have attempted to list the characteristics below - feel free to correct me :-

Load on AC out 2.

Powered firstly by the inverter (until the combined "AC out 1" + "AC out 2" exceeds the inverter capacity) and then by AC mains as well. The combined load must not exceed the rating of the transfer switch.

If the AC mains falls away, the AC out 2 is cut off.

Provides a way to make use of excess Solar PV yield on non-critical loads.

Grid Parallel Load

Powered firstly by the grid (under normal curcumstances does not require any additional capacity from the inverter).

Normally, the inverter drives the loads on AC out 1 (and AC out 2) as required. Under some configured conditions (not eactly clear how), the inverter starts to "push" power out of "AC in" and thus contribute to this grid parallel load. It can supply this load completely such that no power is drawn from the mains supply. The energy meter can be used to regulate the amount of power supplied via "AC in" so that it is equal to, but does not exceed, the grid parallel load.

Is there any guidance as to which approach can or should be used under which conditions.


John Hope-Bailie

johnhb asked
kuban-invertor commented ·

1 Answer

Multiplus - AC-1 AC-2 switch over for Aircon start on genset

Hi, I have a Multiplus in a motor home. All AC was connected to AC-1. Problem was, if somebody pulls the power lead or the generator runs out of fuel in the night, the Multiplus switches to battery and might discharge them too much. AC-2 drops the load in that case, but because its to sensitive, I can't use it to start the AC on the 'at start' unnoticable fluctuating generator.

Its a nearly new Honda EU2000i, perfect for the load.

So I installed an external switch that lets me switch the AC load from AC-1 to AC-2 after a few minutes, ones the generator is running acceptable for AC-2.

I am about to extend the switch with adequate cables to the inside.

Question: Is that a known problem and does it has a solution already?

Is there a config setting I can change?

thanks :)

nicetrip asked
Pantelis Zirinis answered ·

5 Answers

Interlocking AC-Out2 with AC-In possible?


I'm using general flag to ignore AC and some other assistants. I'm wondering if it is possible to switch AC-Out2 off BEFORE AC-In comes available and on again AFTER AC-In gets cut off.

I want to use a Fronius which isn't allowed to be connected to the grid

Thank you!

kind regards,


porcini asked

0 Answers

Can I change the Quattro AC OUT 2 Time delay?

Is it possible to change the delay which it takes for AC out 2 to go live?

I have contactors which are being driven by AC OUT 2, but when the grid or generator input is live (after a mains failure or return) it takes around 2 and a half minutes for AC2 to go live, and hence close the contactors... Is there any way to change this to 30 seconds for instance?

ewalderasmus asked
harold commented ·

3 Answers

Offgrid setup

Hi I’m after some advise I have a victron multi II gx byd batteries and a sma sunny boy solar inverter, there is no ac grid or generator

what would be the best way to set this up.

we have the solar as the ac 1 output and our load on ac 2 output, we were told the ac 2 could be configured to work without a grid but not sure if this is right.

johnww500 asked

0 Answers

AC2 time delay

Hi I’m looking for an assistant if available to shorten the time of which AC2 takes to connect on a mutliplus 3000 The system is used as a power assist only when plugged into shore power and all A/C loads are on AC 2



ianddindustries asked
ewalderasmus answered ·

2 Answers

showing power flowing to AC Loads, but have nothing connected... only on Critical ???

Hi all,

I only have a AC In and single AC 1 out - Critical load connected on my MP2... but I'm showing the widget and it's also showing wattage ?


georgelza asked
georgelza answered ·

1 Answer

MultiPlus AC-Out-2 doesn't disconnect on Inverter mode/mains failure

When there's Mains failure and the Multiplus is running on battery (Inverter mode) the AC-Out-2 doesn't disconnect the load. The manual says otherwise.

How can I resolve this issue?

MultiPlus 24/3000/70-50

FW ver. 422

dannypm asked
dannypm answered ·

5 Answers

Multiplus II and AC Out 2


I am trying to get my head around installation of a Multiplus II. I am installing this in Denmark as there is grid support for this but as far as i understand. The inverter must shut down it's AC Out 1 when the grid fails inorder to protect the technicians on the street to not feed in electricity BUT is there a way i can get power out on AC Out 2 while not delivering to the grid on AC Out 1 in that way i can power some critical things while power is down ? If it is possible i was thinking to put a switch 1, 0, 2 on those critical things so when power drops i can go an d switch it to get power from the inverter AC Out 2 if that's doable and allowed which essentially makes it a off-grid system for that period wile power is down. In the current system i am designing i will have a energy meter and run with ESS since the Multiplus II is a one phase system and the house system is 3 phase so the inverter will start producing energy when it's told from the energy meter there is a usage inorder to get the consumption to 0 as much as possible.


peternielsen asked
harold commented ·

0 Answers

Clicking sound on 15kva Quattro

The system is a 15kva Quattro, 200ah Blue Nova Racpower batteries(currently), about 8kwp in panels (currently).

I have replaced the inverter once to see if the problem persists and it did. Basically when the SOC gets to the percentage where Output 2 is meant to come back on(80%) then the inverter makes a clicking sound (sounds a bit like a relay clicking on and off). Normally the first click is the Output 2 coming back on and then it seems to continue on and off. It does seem to be the Output 2 Relay because the appliances that are on Output 2 turn off and on as it clicks.

The clicking sound is experienced when the Inverter is inverting, when the grid or generator comes through then the clicking stops. It also stops when the Output 2 breaker is turned off.

I wondered if possibly it may have something to do with an earth or neutral issue in the house or possibly it would be better to use a different parameter to activate Output 2 - or something else completely? I would really appreciate some ideas. We don't have this problem on other systems thus far.

Thank you

james-davy asked
dgnevans answered ·

5 Answers

3 phase Microgrid with Fronius (AC and DC coupled) Output 2

I was wondering how the Output 2 on a Quattro or Multiplus 3 phase micro-grid with Fronius works. If the Fronius is on Output 1, how do the Victron inverters make Output 2 operate? Does it operate as it normally does in a normal three phase installation without Fronius?

james asked
james-davy answered ·

1 Answer

EasySolar 48 5000 ac out 2

Hi, i have an easysolar 48/5000, i also have a generator and a temporar grid acces. Does ac out 2 benefits from pv Power or batteries? I read the manual and it says that the current will only go thru AC out 2? I have a heat pump wich i want to connect to the inverter, but i also want to get ac from panels during the day for the ac out 2, for the moment. After i finish the entire project i want to get rid of the grid and stay only with generator and batteries.


catalin-moraru asked
catalin-moraru commented ·

0 Answers

Feature Request: Provide Support for Modbus/dbus switching of Multiplus AC-Out2 relay

I would like to request a feature request to support controlling the AC-Out2 relay in the Multiplus/Multiplus II via modbus.

At the moment, AC-Out2 can be controlled a number of other ways, but there is no modbus register address exposed to allow it to be controlled with scripts.

I am aware I can switch a GX relay connected to the Multiplus and control the AC-Out2 relay that way, but this is sloppy in that it requires extra wiring and also wastes a GX relay (of which there is only 2), and we need the relays for other functions.

trip-tracks asked

0 Answers

Quattro - why install a breaker on AC output?

Have a single 230v 50hz victron Quattro 10,000VA. AC output 1 is supplying a small AC Panel. The AC Panel has a 63A inlet breaker and RCD, and dedicated breakers for each consumer. There are no other supplies into this AC Panel.

The Quattro manual advises the following "An earth leakage circuit breaker and a fuse or circuit breaker rated to support the expected load must be included in series with output L1, and cable cross-section must be sized accordingly."

In the technical specifications part of the same manual, it advises that there is automatic short circuit, and overload protection. My question is, if these safety features are built in, why must there be a breaker on the AC output side of this inverter??.


James Kinton asked
Peter Buijs - NL commented ·

3 Answers

Multiplus AC out suddenly not working (Lots of photos)

I have a Multiplus Compact 12/2000/80-50 120V that has been working perfectly for over 1 year and all of the sudden it won't produce 120 volt.

My batteries are full and the cables suppling power to the inverter are reading 13+ volts on the inverter posts. It has power for sure. Also, the fuse for the inverter is not blown AND I swapped in a new one just to be sure.

I opened up the case and took a look at the interior and have two main questions.

1. How many fuses does this have and where are they?

I noticed a fuse but am not sure what it goes to. I did try and swap it out with another 20amp fuse but that didn't do anything.


2. What is this red, internal LED telling me?

It says "ALARM" but this light isn't visible with the front on the unit.

Here is a closer view



Lastly - When I started troubleshooting the unit I did notice that the sheathing of my romex may have knocked off the protective cover of the fusebox for the power supply to the inverter. I'm guessing these might have rubbed together... Not sure if that actually happened, but if it did I'm wondering if this is what is causing the inverter to malfunction.



evanjs asked
evanjs answered ·

4 Answers

No AC out when no shore power

new installation, i havent touched defaults. I only have ac when connected to shore power. AC in to multiplus, ac 1 out to distribution panel. Everything functions when connected to shore power, batteries are maintained, ac and dc sides powered. disconnect shore power then only my dc side has power. I dont have an interface for the multiplus but just ordered BT dongle so i can check my settings.

multiplus 24/3000/70, Mppt 150/45, 24/12 converter, 6- 24v 50ah battleborns

stoneybiker asked
stoneybiker commented ·

1 Answer

Critical Loads


Is the critical Loads AC Out (AC Out 2) terminal bi-directional?

If I want to keep my complete house AC distribution board powered during a power cut but also fully utilising the solar and battery power stored when grid is available do I just wire one circuit from my house DB to the Mulit I AC Out AC 2?

If so are there any restrictions to the Multiplus that I can expect from wiring the complete house DB through AC Out 2?

neilbridgeman asked
Alexandra rolled back ·

2 Answers

ESS: Using AC OUT 2 for water heating, but only when battery is full and enought solar power is available

I think I've seen this scenario in an explaination video but I cannot find it any more. I'm talking about an ESS System with Mutliplus 2 and Venus GX.

I want to do the following:

1) When I have enough solar power left, so the battery is full and I would feed into the grid more than 3000W

2) Then activate AC Out (a heating element in a boiler) if the boiler temperature is under a certain value.

Is there a possibility to do that? If yes, how?



florianro asked
Rob Duthie commented ·

2 Answers

Ignore AC and DVCC

I have recently installed solar panels on my motoryacht. I am now looking for the most economical use of the solar panels, also in order to reduce the cost of shore power. The electrical system has mainly Victron components, except the panels and battery: Quattro 8000/200, Venus GX, MPPT 100/30, 720 Ah tubular plate batteries and 2 x LG Neon R 370 Wp panels, latest firmwares.

I have studied all the manuals and looked for answers on the community site. Although I see similar setups, I still do not have the ultimate answer on how to use the panels the most economical, either by using Ignore AC, DVCC, lower float voltage or a combination of these.

I fully understand how Ignore AC in VEConfigure works and have now set it up according to below screenshot:


I have been to the yacht today and have tested it with several loads. When using heavy load, the Quattro will deliver the power instead of drawing it from the battery, so it does not unnecessarily drain too much, which would take forever for the panels to charge back into the battery. There is a certain amount of equipment that draws about average 200 W, so in a day I will loose 4.8 kW. On sunny days the panels will charge with about 4.8-5.1 kW. So on cloudy days and near winter time the batteries will slowly deplete and when voltage reaches 23.5 V, the Quattro will kick in and charge (with max 100 A) up to when bulk is finished (85 % SOC). I might change that in wintertime to when absorption is finished, as the batteries need to be fully charged every once in a while. So far so good.

The manual of the MPPT states that the DVCC function will result in the MPPT being an active controller in the system. "For systems with lead batteries, DVCC offers features such as a
configurable system wide charge current limit, where the GX device actively limits the
inverter/charger in case the solar chargers are already charging at full power". I have tried the DVCC feature (without Ignore AC) with a setting of 100 A for max charging and shared voltage, current and temperature sense.
I have observed the behaviour of MPPT and Quattro for a long time and my impression is that the MPPT does not always do what it should. I can see the Quattro charging with high amps and the panels with relatively low. When I switch off the shore power, the panels immediately jump to a much higher charge, so the panels are under DVCC not used with maximum capacity. I would also expect that when batteries are full and loads are low, while panels can produce more than the load, that the Quattro might stop charging all together.

An expert advised to lower the float voltage of the Quattro with 1 V, After lowering that setting to 26.6 V, I saw this morning at around 08.00 hrs that the Quattro stopped charging. Not completely sure why?

I have gathered my thoughts and I think I have to options: 1) use Ignore AC and 2) use DVCC. With option 1, it will deplete the battery more and I think the panels are used most economical, but I need to make sure the batteries are getting a full charge every once in a while. With option 2, the batteries are kept a full charge (100 %)., but I have the impression the panels are not used to the max and the Quattro will only stop charging when the voltage of the batteries is higher than the 26.6 V. Which brings me to the question do I also need to lower the absorption voltage in order for the Quattro to stop charging when in absorption fase in order to get the max charge out of the panels? I find lowering these setting in contradiction to the DVCC manual: "Limit charge current. This is a user-configurable maximum charge current setting. It works across the whole system. MPPT Solar Chargers are automatically prioritized over the mains/generator".

By the way: I use the AC out 2 of the Quattro for heavy users, with the intention that when I loose shore power (while sailing [do you actually sail, drive or operate a motor yacht?]), it automatically switches of the heavy consumers and I will not unnecessarily deplete the batteries. With Ignore AC while still in the harbour, I loose the heavy consumers as the Quattro needs AC on either AC In 1 (generator) or AC In 2 (shore power). I probably have to rewire the heavy consumers to AC In 1.

My questions:

1) Why does the Quattro stop charging when lowering float voltage when panels are charging?

2) Do I need to lower the float voltage in order for the Quattro to stop charging while enabled DVCC?

3) Why is DVCC not using maximum available charge from the solar panels?

4) Do I also need to lower the absorption voltage while DVCC enabled so the Quattro stops charging in absorption fase to maximum use the charge of the panels

5) Can I, or should I, use DVCC in combination with Ignore AC?

Any comment, suggestions, answers are welcome.

I have also published about the installation of the electrical system and the solar panels on my weblog (in Dutch, but has Google translate button): .

jurjenhoekstra asked
jurjenhoekstra commented ·

1 Answer

Multiplus, running espresso machine on inverter and AC on generator on the same ACOut port?

Hi, my air conditioner is wired in my motor home with all other 240V, I can not separate it to connect to 12/3000 Multis ACout-2, which would allow 'drop load, if generator runs out of fuel'. Daniel showed me an assistant, how to start the AC on generator, on ACout-2 . But on ACout-2 none 240V appliances will run using inverter, so I still have to use my external switch to switch 240V from normal use ACout-1 espresso machine on inverter to battery safe ACout-2, to run the air con on generator.

Does ACout-2 has the ability to use the inverter too? Can we configure the assistant to use inverter until ACin becomes available, once ACin becomes available, use it, which is ACout-1 setup so far.

And then ... 'drop load if ACin becomes unavailable, and never return to inverter until inverter ... until restart of the Multi?

Would be nice to have a way to remotely switch between ACOut 1 and 2, so this would be a workaround. Otherwise I have to lay heavy 2.5 mm 3 core underneath the hole truck to the inside.

thanks for an idea :)

nicetrip asked
nicetrip answered ·

3 Answers

Multiplus secondary outlet

Can the secondary output be turned on remotely? For example, if I want to run my water heater off the inverter, but I have it on the secondary outlet, can I turn it on via bluetooth?

cappyjax asked

0 Answers

How can I cut off AC-Out 2 in an AC-PV Coupled System based on Battery SOC?
  • From one of the recent vidoes on the Victron Professional trainings, "Coupled AC PV Inverter Introduction", @ Guy Stewart talked about the Optimal AC PV off-grid configuration and that would fix a challenge I have at an off-grid site that has AC-PV Configuration but no DC. Please how will I configure AC-Out 2 to cut off when the battery SOC goes lower than a particular threshold. Will I use virtual switch?
  • The system is actually working fine, it's just that once in a while when the batteries gets drained, and the Quattro shuts down, the Fronius Inverter can not come up until the generator is put on. Adding a charge controller and solar panels will fix this but the client isn't ready for such expenses yet.
  • On that site I have installed:
  • 5kVA Quattro
  • 5kW Fronius Primo
  • 5000Wp of solar panels
  • 13.8kWh BYD
  • CcGX
  • I'll appreciate any help I can get from @Guy Stewart or anyone who knows how to do this. Thanks

vicstix asked

0 Answers

No second AC out on Multiplus 24/3000/70/16

I just had to find out that I had installed a Multiplus 24/3000/70/16 at a customer that had no second exit. I did not pay attention because it was not a topic so far. Now my question. How long has there been a second exit on this model? I suspected that the dealer had turned on an old model to me. Is it possible that it's a demo model or something?

Robert M.O. Seidel asked
Guy Stewart (Victron Community Manager) commented ·

2 Answers

Can I make AC OUT 2 active on inverting (Quatro)

I would like to have the possibility to switch on AC OUT 2 under specific circumstances.

Battery's full, normal alternator is on for a long time etc

I see similar questitions, but I cannot find how to setup Assistanst or VS for this.


harold asked
harold commented ·

2 Answers

ACOut2 Relay Strange behaviour on brief power cut with assistant.

I think I might be doing something wrong but I've seen some strange behavior with my ACOut2 Relay. I have an assistant that disengages the ACOut2 relay if ACIn2 (Grid) fails. Now you might wonder why because it's the default behavior anyway. ACIn1 is my Generator Input and when the Generator runs I want ACOut2 also to be disconnected. The Generator ONLY runs when there is no Grid power so the logic seems right. It's also a manual start generator so I decide when to power it up (usually only after very long outages).

It all works perfectly except it 'looks' like in a very specific situation it does not work at all.

Here is the scenario: We have somewhat unstable power where I live, every now and then we have a very brief power cut and then it goes back to Grid power. My Quattro detects this brief power cut and switches to Inverting Mode. Soon afterwards the Quattro switches back to Grid power.

I have my gas stove connected to ACOut2 so I can see if the clock goes off or starts flashing '12:00' after a proper power failure but this brief cut it doesn't, meaning the ACOut2 Relay assistant does not disable the relay when the brief power cut is detected.

My two assistants logic states (and also in this order):

Disable ACOutRelay2 when ACIn2 (Grid) Is Not Available for 0s.

Enable ACOutRelay2 when ACIn2 (Grid) Is Available for 30s.

Here is my question:
Is there a time delay that an Assistant is triggered? Could the brief power cut be too short for the Assistant to run but be long enough for the Inverter to kick in and run from batteries? The reason I ask is that when in a high load situation with my Pool Pump, Geysers etc. running is around 6800W we had such a brief power cut and the system started to give overload warnings. Checking VRM it 'looks' like everything on ACOut1 and ACOut2 was powered from the batteries for a good couple of minutes and then the load on ACOut2 dropped off somehow. Is this at all possible? Should the Assistant not trigger at the same time the Inverter sees a power failure?


Ingo asked
Ingo commented ·

1 Answer


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