split phase Image

split phase

Wiring diagram for Quattro split phase with autotransformer?

We have an off-grid system with two 48/10000 Quattro inverter/chargers configured for split phase, with a battery bank and solar chargers. We also have a generator feeding the Quattros on AC input 1 when the batteries are low and the sun is not shining. We have a few 110 appliances that consume significant load, causing the legs to become unbalanced.

I'd like to add a 100 amp Victron autotransformer between the Quattros and the breaker panel so that we can balance the legs, especially when the generator is running.

The autotransformer manual has a wiring diagram for balancing two inverters in split phase, but it's not very specific -- it's more conceptual than "connect this to that". The manual also says "split phase output balancing may require some more attention", but never goes into more detail on how to do it. Does anyone have a more specific wiring diagram for balancing two Quattros with the 100 amp autotransformer?

Also, the Quattros open the ground relay when the generator is running. I've wired that up to the autotransformer so that it will drive the autotransformer ground relay. However when the Quattro is powered by the generator the ground relay is opened, which I don't think I want to happen -- the autotransformer ground relay should always be closed, as far as I can tell. Does anyone have any tips for forcing the autotransfomer ground relay to always stay closed?

half-moon-bar-lodge asked
GARY WILLETT commented ·

1 Answer

Autotransformer wiring for balancing loads, split phase 120/240

My AC source is split phase120/240. It supplies two hot wires and a ground, no neutral. I am using a Victron transformer because I am splitting the two phases into two separate battery chargers for my RV, but I need the loads on the two hot wires to remain balanced. My question is, would it be correct to connect the two hots AND the ground into the autotransformer, and then use the two 120 lines, the new neutral (created by AT), and ground coming from the autotransformer to connect to my loads (battery chargers)? Any potential issues with that set up?

brianv asked
wkirby answered ·

1 Answer

Autotransformer output capacity

I am confused as to what the actual output of the autotransformer 32 and 100 amp is. I see that the neutral caps out at 32 amps on both. So does that mean that the total output of either autotransformers is 3840VA in split phase 120/240? It doesnt make sense because if you are connecting let's say two 120v 5000VA Quattros to the AT to create balanced split phase current, you basically lose a bunch of output capacity. Or is the 100 amp version able to output 100 amps total between the two 120 lines?

brianv asked
wkirby answered ·

2 Answers

Using AutoTransformer to create 120v/240v split phase from single phase 120v input

I have a use-case for the AutoTransformer that is different from what I see generally discussed. I want to use it in my RV to take in 120v 60 Hz from either my Onan Generator (2 separate 120v legs that are SAME phase) or the shore power inlet (30/15 Amp which are 120v 60Hz single phase). I have those 2 inputs going to an automatic transfer switch so whichever one is "on" will pass through to the AutoTransformer. I would like for the AutoTransformer to step up the voltage from 120v single phase to 120v/240v split phase. I will then pass that split phase into the input side of my dual inverters (one inverter for each 120v leg) so that when I have a single leg input, I still get both inverters charging instead of one side passing through voltage and the other rejecting the phase and inverting to make the "correct" phase.


So, my question is, how should this be wired up to the inverter. It has labeled "input" and "output" sides but the "input" side only has 240v Line and Neutral labeled connectors. The "output" side has 120v Line 1, Neutral, 120v Line 2 connectors.


My intuition tells me to disregard the input/output labeling and connect my source 120v power with:

source 120v Line > AutoTransformer "output" Neutral

source Neutral > AutoTransformer "output" 120v Line 1


Then my output would be the 240v wave form stepped up via transformer as measured between the "input" Neutral and "input 240v Line connectors. I would need to carry over the neutral from the other side to provide 120v/240v split phase.


It is this last part I am unsure of and need some guidance on.

[image]

Diagram attached of my planned whole system that hopefully makes clear what I am trying to achieve.


Thanks!

cookinwitdiesel asked
blueovalbruin commented ·

2 Answers

24v DC supply shuts down when inverter state of charge gets low

[image]

Help would be much appreciated.

We have a Quattro 5000 120 in our camper.

Sockets etc are ran off the victron but a separate mains control is used for lights and water pump.

I think the victron dictates what happens with this also.

The victron is at 65% power and this mains control just died. So sockets and fridge etc working but not the lights or water pump which are obviously important.

Does anyone know if a switch or relay may have kicked this mains off (Maybe a 24v mains)?

How can it be reset? I am a novice but I guess there is split power switch or setting that has kicked the 24v (I think the lights and water pump are 24v).

When we first got the vehicle the victron was badly set up and the 24 v power was killed when the battery’s were below 90%.

This was reduced to 20 or 30 but maybe it has reset somehow?

I need to be able to get the lights and water work pump working but have no clue how to get the victron to enable them again.

Please help. Many thanks

stepheng asked
seb71 answered ·

1 Answer

Split phase with two 120v Quattros and 5500 onan genset 30 amp each leg in an Rv configuration

I have two quattros I am going to setup as primary and Secondary/slave. I believe my 5500 watt onan is split phase 180 degrees out for 120/240.

Do I need a transfer switch if the genset is connected to ac-1 input on both quattros?

I would like to wire the quattros with each leg from genset to each Quattro along with each leg from shore power to each Quattro.

just want to make sure the transfer switches in the quattros can handle the transfer between shore and genset without an external transfer switch…

thx for any input

Geoffrey Schwark asked
Kevin Windrem commented ·

2 Answers

Autotransformer voltage outputs are different

I am having an issue with the Autotransformer output voltages - 114V on L1 and 120V on L2 (with no load)

120V current is supplied by a Quattro 48V / 10000 / 140-100/100 to the 100A Autotransformer. I'm using the AT to provide a split-phase 120/240v supply to the 50A main break panel in my RV

I have wired the AT connections according to the diagram #3 shown on the system schematics page from the Victron website: (https://www.victronenergy.com/upload/documents/AT-3-split-phase-120V-to-120-240V-with-Quattro-120V.pdf)

The Ground Relay in the Quattro is set to ON and is correctly grounding the Neutral to earth.

Here are the voltages I read at the terminals:

[image]


The problem I have with this is that the voltage on L1 decreases a lot with load, and when occurs equipment will pull more current to compensate for the lower voltage.

Here is a pic of my RV control panel, showing the disparity in voltage between L1 and L2. Even though there are 2 air conditioners on Line2 it has only dropped 2 volts - Line1 dropped from 114v to 105v. This can't be good.

[image]


Questions: 1) - Is this method of wiring correct, and 2) what is causing the voltage discrepancy?

Thanks!


Aug-31: Editing this in an attempt to make the question visible again. I'm thinking of sending this AutoTransformer back to Victron as it is not performing to expectations. I have seen voltages as low as 96 volts on L1, at which point my UPS shuts down my computer, and various other circuits shut down. Not happy...

I'd appreciate a comment from anyone who has had experience with an AutoTransformer.

Wiki

Pete MacLachlan asked
dbainbridge answered ·

4 Answers

Split Phase System Configuration Advice

Need some advice on my setup please. The system consist of the following:

2- 48v 3kVA Quatros

50 amp 120/240 Split Phase Shore Power

7,500 Watt 60 Amp 120v Single Phase Generator

Cerbo and a bunch of solar ect...

The system is configured in 120/240 split phase with the shore power L1 going to the master Quatro AC-2 input and L2 going to the slave Quatro AC-2 input. The generator simply goes to AC-1 input on the master Quatro with nothing connected to the slave Quatro AC-1 input. This setup works fine but its a little lacking when running the generator when the batteries are low. I never see much more than 3,000 watts from the generator and the batteries don't see much of a charge when the slave Quatro has a load on it. This causes the generator to run hours on end not charging the batteries. Spending 12K on a new 240v split phase generator is out of the question. We need to keep the split phase for the 240v appliances onboard. Will a Victron auto transformer between the generator and inverters work for me? Or maybe two transformers so I can stack the inverters.. One after the shore power, 240v to 120v to stacked Quatros and then another transformer to get split phase off the Quatros. Any advice would be great thank you.

Lee


burnscraft asked
Kevin Windrem answered ·

1 Answer

Suitability of 2 x multiplus 3kVA in split phase configuration to run 1 HP pump

I've asked this question through a dealer channel but no response from Victron for over a week so hoping I can get an answer here.

I have a 115/230V 1600w jet pump in an off-grid application. I'm considering using two Multiplus 3kVA units in a split phase configuration to run the pump at 230V.

The concern is whether the Multiplus system can handle the inrush current of the pump.

The pump starts and runs fine with my 5kW 240V generator, and using a clamp meter I measure 34.5A of inrush. That's 8280W of surge.

According to the Multiplus specs, a 3kVA unit can handle 6000W of surge. With two units in a split phase configuration that provides 12000W of surge.

It appears there is suitable headroom to do this but I'd like some assurance before moving forward.

Is my math correct? The other unknown is how long of a surge the Multiplus unit can handle.

And if it does handle it, will a warning be generated every time the pump starts?

Thanks for any advice!

adombek asked

0 Answers

US-spec split phase 240V appliances on Victron single phase inverter

I’d like to run US split phase 240V appliances (such as induction cooktop or oven) directly from a Victron single phase inverter. These are 3-wire appliances, expecting two hots and a ground but no neutral. Will an autotransformer be required or from the perspective of the appliances is single phase and split phase the same thing.

banana asked
Barry Timm commented ·

2 Answers

split phase 240v INPUT to Quattro 230v

I have a 230v boat. with a Quattro 5K inverter charger. If I am in the us and have 240v split phase shore power, can it be safely connected to the Quattro using shore L1 (120v) and L2 (120v) which is 240v between them. Connected to Quattro input 1 L1 and Neutral?

I know that I can safely do this with all systems onboard using Shore L1 and L2 to Boat L1 and N without having the Quattro inline. What I am not clear on yet is if having the Quattro inline is an issue?

Theoretically, the Quattro shouldn't care.

I would appreciate a definitive answer on this. Would be an expensive experiment if it went wrong!

mixman1 asked
Kevin Windrem edited ·

2 Answers

240v AC single phase to 120/240 split phase


[image]

I have 240v AC input 50hz (European) input and I need to have split phase 120/240v 60hz for a clothes dryer. (as per diagram 14-50R plug)

Would this transformer work for this application.


****This dryer as most North American units uses 120v ac for timer etc. and 240v ac for the heater element****


Thanks

Dave

luminavanman asked

0 Answers

Single Quattro for one side of split phase

Would it be feasible to add a single Quattro or Multiplus (not the 2x120v) to provide one half of a 240V split phase (North America 120/240V residential power) while taking the other phase directly from my main panel and passing it through along side?


I’d like backup/UPS for the equipment but would move lighting to the non-inverter phase. I’d also like to add a 30A 240V that wouldn’t be powered during utility outages (for car charger or brewing setup, I guess this is the trickiest part, and I could skip it).

Is there a reason it would be inadvisable to use an inverter on only one phase? If it’s okay, what extra considerations should I make?

owenfi asked

0 Answers

Multi+ Duplicating Watts readings on a 230v Split Phase with Autotransformer

Hi Victron,


I live in Central America where we use the US Split phase grid system, I have a ESS system with:

- 1ea Multiplus 48/5K/ 230v

- 48v Lifepo4 Bank 450ah

- SmartSolar MPPT 250/100 rev2

- AutoTransformer 32amps

Note: the system does not feed to the grid.

I have setup my system as per Auto-transformer manual advice for Split Phase systems as below:

[image]


I have noticed from the beginning of my setup a drastic Watts measure change when Grid goes out and I already read your article here https://www.victronenergy.com/live/ccgx:ccgx_faq including the Q6.

But My case is in my opinion more drastic reading difference.

This is a normal Watts reading with Grid power:

- My home consumption says: 1016W

- Battery charge current: 48.6Amps (2452W)

[image]


Right after I open or disconnect the Grid:

- Home Power consumption: 480W (Half reading). I confirm No changes in the Real home Load equipment.

- Battery Charge Current: 58.8A (2971W) Yes the MPPT generation increases in that moment 100W but that does not justify the 500W (10Amps) Battery Charge increment. Looks like the increment in charging is due to the decrease in Loads need by the Multi+

[image]


The behavior is telling me that for some reason having a 230V Multi connected to 2 Live power lines (L1=120v + L2=120v), the Multi is duplicating the reading in the ACin/ACout side and direct affecting the battery charge performance. Since this 230v Multi+ is designed to connect L1=230v + Neutral. I think this Multi+ is not properly reading 2 live phases L1 + L2 correctly, instead it is duplicating the reading.

I have done other testing with a 3rd party watts reading and the reading is half lower than Multiplus AC Loads reading and that make me think my suspicious is correct. Can Victron staff please confirm my situation here?

I know that an option here is to get the Carlo Gavazzi meter for better reading, but I will like to ask if Victron can do a Firmware adjustment for customers that use their 230v Multis in US market before expending more money.


@mvader (Victron Energy)


Thanks a lot



Yusef Neblett asked
pganguet answered ·

6 Answers

Dual Multiplus 12/3000 in Split Phase Running on Single Phase

Hi folks,

I'm new to the forum but have been looking for an answer. I have two Multiplus 12/3000 inverters with a Venus GX (and additional Victron solar items as well) in a motorhome. These were all purchased in last 90 days or so, so fairly new hardware. The motorhome is wired in split phase and everything works 100% of the time when i'm on a 50amp standard USA RV service. My setup also cuts over to my QD1000 generator flawlessly and everything works fine.

My issue is when i'm plugged into a 30amp single phase plug. When I am, I understand normal operation "should" be that my master inverter will invert and charge the battery and my slave inverter will simply invert. This is a Victron limitation on single phase power as i understand it which is fine. My question is. When i'm plugged into a single phase 30amp plug, neither the master nor slave inverter will recognize the AC input. The input shows in the Venus panel as there on both legs (single phase on both legs because of the 50a to 30a dogbone adapter that pairs the single phase 120v to both legs) but the units will not initiate a charge, its basically like i never plugged anything in at all. See attached screenshot. Any advice on what setting may be causing this to occur? I'm fine with only one inverter charging, i just need to understand why thats not happening..

[image]

[image]

Any helps or advise would be greatly appreciated.

epm96 asked
jdake414 commented ·

2 Answers

ET112 Energy Meters Two for Two phase

Can we use two ET112 Meter to measure grid input on a 2 phase site? We have them in stock already. We have set them up but we cant seem to assign one to L1 and one to L2 because they seem to be locked in a 1 phase convention.

David asked
markus answered ·

1 Answer

Onan 8000 generator single phase (two circuits) connection to 2 Multiplus chargers?

For my RV application, I have a transfer switch with both shore power (50A) and generator power (Onan 8kw) as input. The shore power is normal 2-phase 240V, while the generator output is 2 30A single phase circuits.

I don't need 240V in my RV - everything is 120v. Is there any reason I cannot connect each leg of the transfer switch output to a separate Multiplus inverter/charger? When on shore power, the 2xMultiplus inputs will be 180 degrees out of phase. While on generator power, they will be in phase.

At this point, I am not planning any passthrough loads - all loads will come from the inverters.

oceanos asked

0 Answers

MultiPlus 120V Shore power, 240V Load?

I am looking at using two Victron MultiPlus (24/3000/70-50 120V PMP243021102) inverters to supply 240V Split Phase power. Can I get a 240V Split Phase output (120V from each inverter and 240V across both inverters) when my input (Generator or shore power) is only 120V single phase?

davem asked

0 Answers

L2 On Grid showing Negative power (2x Quattros Split Phase + AT)

SOLVED - (See comment below) I am having a strange issue on my new Victron Quattro setup. I am seeing a negative number on my grid current. The AC loads side is also incorrect. I am running 2 Quattros and an Autotransformer wired exactly per this guide: https://www.victronenergy.com/upload/documents/AT-4-stacked-inverter-2x120V-to-120-240V-with-2xQuattro-120V-REV-B.pdf

Any suggestions? I have connected the GND Relay, changed the dip switch and have confirmed it is switching the relay on the AT. Ground Relay is disabled in both Quattros

Everything works perfectly when Inverting. The AT is balancing L1 and L2 perfectly. This strange issue is only showing up on shore power.

The attached photo is with the main breaker off after the AT (No Loads)


[image]

jetwire asked
jetwire edited ·

1 Answer

Using a Quattro 48/10000 230V with Autotransformer in US residential 240V split phase

I was originally asking about design consideration between using one large inverter or two smaller inverters. Then got onto a bit of the design using one large inverter, but that wasn't really pertinent to the Subject for tha thread.

https://community.victronenergy.com/questions/58759/choosing-between-one-large-inverter-or-two-smaller.html

So I'm re-asking the one-inverter-autotransformer question here in a dedicated thread. Has anyone set up a 230V Quattro with Autotransformer in a US residential setup ?

I'm envisioning a setup as follows :

  • Main panel : 100A breaker to Quattro AC1-in
  • Main panel : 100A breaker to sub-panel 100A breaker with interlock
  • Quattro AC1-out to Autotransformer
  • Autotransformer AC-out 120-0-120 hot-neutral-hot to sub-panel 100A breaker with interlock

The interlocked breakers are a back-feed setup for the sub-panel. Only ONE breaker can be on, the other must be off. So the sub-panel is fed by EITHER the 100A from the main panel, OR the AC-out from the Autotransformer. For example

https://media.suthlbr.com/products/images/21125/QO48M60DSGPSTR.jpg

In the US, there can be only neutral/ground bonding point, it must in the main service panel. So the GND relay in the Quattro should be disabled, and the GND relay in the Autotransformer should also be disabled. This way, regardless of whether the sub-panel is fed from the main panel or from the Autotransformer, the neutral/ground bond will only be in the main panel.

The created neutral from the Autotransformer is connected to the neutral bar in the sub-panel, which connects to the neutral bar in the main panel, where the final neutral/ground bond is made.

During an outage, power to the Quattro comes from a 240V generator, using only the L1/L2 hot legs. The neutral is not connected, so it acts just like the connection from the main panel.

Does this all make sense ? Is it correct for a US residential install ?

https://www.autodraw.com/share/IE7PDGNCPO0V

[image]

halfwalker asked
henry-cabrera answered ·

3 Answers

What is best ESS system for my situation? Costa Rica (US spec split phase 120/240v 60hz)

I have a medium sized 3 bedroom "luxury" home in Costa Rica. We have US spec power here and my house has a normal US spec 120/240v split phase panel. We have a bunch of 120v loads which are receptacles, lighting, ceiling fans, gas range/oven, microwave, dishwasher, washing machine, refrigerator. Then we have a bunch of 240v loads: 3x single room euro type air conditioners, pool pump, 2x instant water heaters, and clothes dryer.

My electric bill averages around 900 kwh per month.

The grid here is unstable and causes constant problems with appliances. We are constantly replacing "motherboards" and "control boards" and small appliances due to damage from unstable grid.

I am going to install maybe 6kw to 10kw of solar panels and need to consider what ESS topography and what Victron equipment is going to make the most sense. I was thinking of doing a 48v battery bank as it will be exclusively for the ESS system so seems that would be most efficient.

At first I was thinking I was limited to the relatively small selection of US spec 120v products but now that I think about it I can do an autotransformer and use a 230v Quattro or Multiplus II then set it to 60hz.

I read some posts from other using two 120v Quattros in split phase or a Quattro and an autotransformer.

It gets a bit confusing. I think I will do a Fronius PV inverter but seems like I may want to put it on the Victron output so I can stay "up" when the grid goes down or when the grid goes out of spec we can have inverter take over and still have solar PV.

In Costa Rica you can't "sell" excess power back to the grid but you can get "credit" toward future kw hours that you may need to consume later. I guess this makes grid tie PV make sense as you can hopefully trade off kwh between day and night but this does not solve the instability problems.

I thought about going totally off grid to just have perfect power all the time but system would need to be quite big to be sure of no problems. I would need one or more chargers to be able to charge from grid as necessary.

Any thoughts as to what setup is best?




l00semarble asked

0 Answers

2 Phasen Betrieb mit Multiplus2

Hallo,

kann mir jemand sagen ob statt einem 1 oder 3 Phasen Betrieb auch ein 2 Phasen Betrieb möglich ist.

Soll heißen, das der WR1 an L1 läuft und WR2 an L2. Wobei dann auch die WR am Ausgang nur durch N verbunden sind und ansonst getrennte Strompfade haben soll heißen das kein 3 Phasen Verbraucher angeschlossen ist.

Konfiguration ist mit 120Grad Versatz ja möglich...




knut asked
knut edited ·

0 Answers

Using 2 Multiplus's in Split Phase configuration, Need 2 wire Assistant and would like to accept 30A service (one leg power).

Every time I allow each inverter to attach independently to power source I loose the assistant and every time I add the assistant the inverters lock together again?

treejohnny asked
Paul B answered ·

1 Answer

Leg 1 Split Phase no power : dual Quattro 3000

Trying to set up two Quattro 3000 as split phase 240v.

Ran the VE bus config. Set the VictronConnect settings. Everything went well and looks good on the screens. But no power on L1 from the voltmeter. L2 reads 120v.

Is this normal? The software says OK. But I should read 120v on both legs? And 240 between the two poles?

Update: I tried switching the order of the two legs. L2 is now L1 - reads 120v. The new L2 is 0v.

>>The battery and solar controller each go to two busbars. The bus bar then feeds with identical cables to the pos/neg of the two inverters. I have been careful to keep the dimensions and lengths of the cables the same.<<

Final note: swapped out the Quattro 3000 that wasn't producing power, regardless of L1 or L2. Tested the output of the new inverter after updating firmware. 120v observed. Configured through VE bus config. Immediately had 120-0-120. Or 240 split phase.

If you have this problem. Its probably a wonky inverter.


creeky asked
Paul B answered ·

1 Answer

Choosing between one large inverter or two smaller for US 120-0-120 split phase

We're getting ready to install a new Victron setup at home. The old Trace (before Xantrex even !) finally died, and upgrading is in the winds ...

Being in the US, we need 120-0-120 split phase of course. Can anyone show the pros and cons between the two options here ?

* One large 230V Quattro to take in 240V from grid, 240V from gen (neutral not connected), spit out 240V to 100A autotransformer to sub-panel for two L1/L2 120V supplies.

* Two smaller 120V Quattro to take in 120V each from the two grid L1/L2 legs, and L1/L2 from gen, spit out two L1/L2 120V legs to sub-panel.

halfwalker asked
audreez answered ·

6 Answers

Split Phase Quattro reading AC input voltage but showing 'Active AC Input Disabled'

Not able to charge batteries. Quattros don't seem to go into charge mode. Voltage readings are present on AC input but Cerbo shows 'Active AC INPUT DISABLED'.


Looking for someone who can help remotely? Willing to pay for system review and configuration help.


Setup:

240V Split phase - 2 Quattro's 24v/5k/120v - 100A Autotransformer

1200Ah Pylontech compatible batteries (3 400Ah in parallel)

220v / 60hz Shore power

10kw Generator

[image]

[image]


[image]

[image]


D S asked
Daniël Boekel (Victron Energy Staff) answered ·

2 Answers

Stacked Quattro / Split Phase with SINGLE phase 240v input

I've search the forums and I have found similar question, but nothing specifically what I am trying to do.


I currently have a boat with 2x Quattro 5000/24/120V being supplied by a (very heavy) transformer which takes the Single Phase European 240v, stepping down to the required 120v for the Victrons.


I really want to convert the whole boat to native 240v. Most of the big ticket items I can rewire, but apparently my expensive quattros are stuck at 120v. I then had the idea to re-wire/re-program them to 120v split phase to give me the 240v and a dealer very helpfully sent me a diagram to confirm this was possible. However, the diagram shows the 240v input as split phase with the neutral returning to dockside as well as being linked in the Quattros.


My question is: Can I supply Quattros set up in split phase with a single phase and simply join the split phase neutrals at the quattros?


PS. Motivation for doing this is to get rid of the heavy transformer and use 240v appliances as I am based in Europe.

rotortalk asked
rotortalk answered ·

2 Answers

Is it possible to set up a split-phase 480/240 V with a European Quattro?

I need to connect from the power grid ( 2 phases at 480 V with neutral conductor) a split-phase system with two Quattro to feed a serial of street-lights at 240 V.

andrescortes asked

0 Answers

Victron Quattro Inverter & Charger idle consumption (DUAL) -- New Off Grid System.



Hello


I'm building a new off grid system on a school bus and would like to get some help before buying the components



I will be using DUAL (2) inverters 120AC Quattro to have a split phase (240V)


What is the Idle (no load) consumption for:


Victron Quattro Inverter & Charger | QUA483021100 | 48V DC, 3000VA, 120AC


Also for:

Victron Quattro Inverter & Charger | QUA485021100 | 48V DC, 5000VA, 120AC




Also I wonder what did I forget to put on this list (below) in order to make (2) dual inverters work together (either 3000VA or 5000VA depending on the idle consumption specs)



I plan to get the following parts:



(2) Quattro


(1) GX Touch 50 Display


(1) Victron Energy Cerbo GX


(1) Victron mppt 250/100 MC4




Any extra cables/wiring/connectors/programmers/controllers are necessary on Victron’s end?


Thanks

skoolie asked
Vance Mitchell commented ·

1 Answer

Multiplus 3000 Split Phase Voltage Issues

Hello,

I have two Multiplus 3000's in an RV split phase with 50amp shore power (two legs of 120v power in USA). The units are configured in split phase and are hooked up to a 12v lithium battery bank with 800 amp hours of power (8 batteries in parallel).


I am experiencing a weird issue, where one leg's input voltage from shore will drop down to ~100 volts and the other leg will increase to ~135 volts causing my surge protector to trip briefly then everything resets after 1-2 seconds and the cycle repeats. I've tested in multiple locations and this is occurring in multiple locations so i've ruled out the shore power actually being the issue (i think, open to suggestions but this has occurred in 10 locations. We also just replaced our surge guard transfer switch to check if that would fix or be the cause). The issue seems to occur extremely frequently (every 15 seconds) when running a 1500 watt or more load on either leg. We have tried both dynamic current limit and without and UPS function and without with no noticeable change. When the issue is occurring the units will switch from float to inverter and back in a fraction of a second I think because of unhealthy input voltage. We are running through the system checking for loose wires but don't expect to find anything but will double check.

Everything works fine on battery and when not connected to shore power.

I'm curious if anyone has ever seen this before and if it may be a firmware issue or a result of a split phase configuration issue? We are running the 430 firmware that came with the units and didn't want to upgrade without checking here first if anyone has seen this issue.

epm96 asked
optingoutofnormal commented ·

1 Answer

46 Posts
71 Users
0 Followers

Topic Experts

There are currently no experts identified for this topic. Can you answer questions in this topic area? Community members who provide answers that are marked as correct earn reputation and may become recognized as topic experts.