Pylontech battery cable spec


Can someone please clarify the following:

The Pylontech 2m external power cables (both + and -) is labelled 4AWG. The Pylontech US3000 manual (page 12) rates this as a 120A cable. AWG 4 translates to a 21.2mm2 cable with a current carrying capability of 70A at 60 deg C. (

A Pylontech US3000 battery (page 4 of manual) has recommended charge/discharge capacity of 37 A. This cable should work fine with a single module. However 2 modules in parallel will double the current capacity while voltage remain at 48V. Are we really using a 70A cable on a 74 A supply source? Obviously the max current per single US3000 is much higher.

The Pylontech cables does not appear to be a copper cable. The wire strands are silver.

Thank you


JeanMc asked
DayAndNight edited ·

3 Answers

Building three phase ESS with Multiplus 5kW and Pylontech


I am planning to install a ESS system according to the simplified schematic below combining 3 x Multiplus 5000VA for timeshifting energy and occasional backup duty. I hope I have gotten it right!

So my questions are,

1. What is the minimum battery requirement with Pylontech US2000 Plus batteries for this system? The Victron guide on Pylontech only covers off grid use which is more demanding compared to ESS. A breakdown of the requirement would also really help so I can think for myself next time :) Inrush currents have been mentioned before but I cannot find any numbers to base my decision on.

2. Can I add more US2000 Plus modules several years later even if they have different state of health?

3. Can I add other battery types in the same installation?



Sven F

S_Forsberg asked
DayAndNight answered ·

1 Answer

LiFePO4 regulator settings & 3 port BMS connections???

@Justin Cook - Bay Marine Supply USA

I am still waiting for anyone to confirm I am correct on the new battery presets (which I have been told don't exist), (see pics attached).

Or am I missing something?

I also have had no reply in about 6 weeks regarding confirmation of my BMS connections being correct or otherwise, I am not comfortable proceeding with the final connection of the BMV-712 to the battery positive until I receive same.

I have marked up a picture with labels for for all cables, hopefully that makes it clearer.

I actually just followed former advice to another person put the shunt in the Blue Bat Neg cable here:

I also included a picture of the battery & BMS before any connections for clarification.

Stay safe folks.






Tex260Z asked
Matthias Lange - Service Team Döbeln DE answered ·

2 Answers

Do I need temperature censor?

I have one battery bank (an separate bank for starter) with 4 AGM 79Ah in different places in my boat. I have SmartShunt + MPPT 75/15 solarcharger + Ctek M300 Charger. The SmartShunt and solarcharger are inte the same space as the first battery and near the engine so the temperature will be higher for the first than the rest batteries. The second battery is under the kitchen and the rest two batteries are placed in front area. A temperature sensor is in the solarcharger. Early in the season we close the door to the front area in the boat and the temperature will be up to 10 degrees lower than in the rest of the boat. So it can be 40-50 degrees C near the engine an only 10 degrees C in the front. Should I use a Smart censor and where should I place it?

Joaher asked
Joaher commented ·

1 Answer

dimension question - 75/15 versus 100/20 - max PV input ?

Hi All,

* Charging 12 volt 220AH (2 x 110AH battery bank)
* 2 panels both 24V short circuit - already purchased
* Planning to install in series , looking to select a controller

75/15 or 100/20 ?


My PV voltage is well under 75 at 48V peak
My PV current will be about 6A

So on paper the 75/15 firs the bill

BUT - my total "theoretical" panel power in Watts will exceed the "nominal" figures quoted here:,-75-15,-100-15,-100-20,-100-20_48V-EN.pdf

by a good few watts

given I and V are well under, is that alone enough to say "the 75/15 will be enough"?

or should I err on the side of caution and get the bigger one please (and why please)

Many thanks in advance



bigbloke asked
Matthias Lange - Service Team Döbeln DE answered ·

2 Answers

Quattro & Fronius Mini Grid Back Feeding to Diesel Generator

Hi team,

I have this mini grid system comprising 6 x 10KVA quattro inverters and 2 x 27KW Fronius inverters, the system works fine but the problem comes in when when the diesel generator comes in and the grid inverters are producing power, the excess power back feeds into the generator, what settings can stop the back feeding?


Sammy asked

0 Answers

Last update to VRM showing "in an hour"

lately the VRM portal shows as "last update" : "in an hour", where that used to be the actual last update f.e. 5 minutes ago, which is the info you would want to see to know if the site is up. The last update "in an hour" doesn't give any information, and technically isnt correct. can this be modified to the last actual update ? thanks

Peter van Zwol asked
Teun Lassche (Victron Energy Staff) answered ·

2 Answers

Has DC system - how to setup alt chargers

I have a Cerbo GX, 24v system, Quattro 8000 with a SmartShunt for the 24v. I also have a 12v system with a bmv that is powered using 2 Orion 24-12 TR chargers. The 24v side is also charged using a 12-24v Orion TR when the alternator is running. How do I show the correct voltage and amperage in the GX for both the 24v battery and the DC display?

Bowpay asked
ben commented ·

1 Answer

Accidentally reversed polarity of pv input

Mppt 150/100 appears to be blown due to reversed pv input polarity. Is it possible to repair the damaged unit from this type of fault?

Stan Flowers asked
EricK1974 answered ·

2 Answers

Cerbo GX Generator Display Bug - Not detecting digital I/O reading

I got everything finally installed in our larger RV offgrid system.

The Cerbo GX is the central component and is so far working pretty good but running into a generator issue.

When the generator is stopped outside of the Cerbo GX (manually) the Main Generator Screen does not reflect a stopped generator.

If I stop it from the Cerbo it works fine but the I/O digital input doesn't seem to change the outcome of the screen.

The settings screen will show that the generator is started and stopped based on the I/O port. Is this a bug?

This is a really big deal because I have a precision plex system that can activate the generator outside of the cerbo. The open/close contact for I/O generator are being fired but the main screen won't give me the correct into. (not good)


(Generator has been stopped manually on the generator)


Bowpay asked
Bowpay edited ·

0 Answers

Quattro Buzz Sound on A/C compressor load?

When I am on shore power and the Air Condition compressor kicks on the Quattro makes a buzz sound for about 2 seconds. Is this normal? Shouldn't the power just pass through while on AC1? It doesn't look like it's trying to invert when it happens.

Bowpay asked

0 Answers

Suitable Circuit breakers


Im just after some advice on a suitable circuit breaker between the panels and the mppt

I will be installing 3 (potentially a 4th in the future) Victron poly 175w panels in series and a Smartsolar 100/50 MPPT but am unsure of which circuit breaker to install between the 2 in order to isolate the panels if need be and also for safety.

Given voltage will be up around the 72 mark what would you suggest? With 4 panels it will be around 94v

Between the MPPT and batteries would it be advisible to install a 60 or 70amp medium duty thermal circuit breaker?

Brent1982 asked
Brent1982 commented ·

2 Answers

How many total kWh during a certain time

I cannot find a way on VRM of totalling the amount of kWh consumed over a set period of time, say overnight, this would be very handy as running an off grid system as is for analysing I have to set to 12hrs and add up the consumption or am I being stupid!?

Matt drummond bell asked

0 Answers

ESS, Fronius zero feed in and grid setpoint negative setpoint without draining batteries?

Hi I have an ESS system where ive incorporated a fronius primo 8.2kW inverter i have all communication set up and working for zero feed in, however i want to allow export of 16 amps or 3.68kW as this is acceptable, I assumed i would be able to set the gridpoint to -3600 and it would allow the inverter to put upto this amount out onto the grid before limiting output. However the victron actually started pulling power from the batteries to export 3600 watts to the grid. Is there a way around this as the customer can actually gain a tarriff from exported units but it makes no sense to drain the batteries into the grid.

Thanks Jack

jacko asked
DayAndNight commented ·

2 Answers

Cannot connect to remote console.

I cannot connect to remote console, though VictronConnect connect app or through VRM.
I have updated app and reset the Victron (multiplus II GX) no data or connection for 2 months!? Help!

willowfarm asked

0 Answers

Mppt 150/75 setup as 24V is changing its voltage setting

I have installed a MPPT 150/75 connected to a 24 Volt battery bank. 2 days ago the battery dropped by mistake to a very low voltage (0% charge) . the next day when the sun came back the MPPT charger started as a 12 Volt battery as a result the battery (24V) never re filled.

My question is this normal or how can i avoid , i do have the connection cable and software to adjust the settings and monitor.

peterako asked
Daniël Boekel (Victron Energy Staff) commented ·

1 Answer

Travel Trailer Generator Backup Question

Hello, I just wanted to ask if this setup sounds correct for a backup with a generator. I have a travel trailer with a 1600W air conditioner (3900W Startup). I want to have a 2800W generator to back up in case of loss of shore power. I am looking at the Multiplus 3000W 12V to 120V, and a 60A MPPT to handle the 800W of solar into 2400W of lifepo4 battery. The generator has an autostart feature that works when it senses a closed loop. So, my idea was to have the inverter installed normally with AC coming in from a Automatic Transfer Switch. I would have a rely that would close when shore power is lost thereby closing the loop and starting the generator. The ATS would switch to generator power and send it to the multiplus. Does this sound workable?

My questions are about the battery charging. Since I will be charging from solar and the multiplus, is there a way for the units to communicate so as to not send too much current from both units together? Any other devices I should have besides the multiplus, solar controller, and ATS?


CappyJax asked
CappyJax commented ·

1 Answer

Off-grid Victron Solution coupled with a Victron solar DC chargers and AC Wind turbine

Hello Everyone,

I'm designing for a client a completely remote solution/off-grid system with Victron technologies.

I'm feeding an average of 5kW AC load 24/7, 365 days a year, so I'm targeting both solar and wind to reduce my battery bank capacity since both sources are feasible to introduce in the project's area.

Accordingly, a battery bank with a Victron Quattro 8KVA DC coupled with several Victron smartsolar charge controllers in parallel and AC coupled at the AC output (load side) with two or one wind turbines having a total capacity of 6~7 kW max.

Can anyone help identify the best wind turbine system to couple them with this system? having an inverter that de-rates when the batteries are full (frequency controlled by the Quattro) and that operates efficiently at low wind speeds?

thank you in advance,

Georges asked
Sean commented ·

2 Answers

3 solid Led Lights on MPPT

Vitron 100/30 MPPT 3 solid Blue led lights on any idea what that means. Thanks.

The Jolly Sailor asked
Johnsparrow answered ·

2 Answers

Connect Dashboard

I have a BVM712 & Smart Solar MPPT100/30 I connect via Bluetooth on my iPhone and its great. But finding it a bit of a pain having to keep switching between devices. It would be great if the iPhone had a dash board section that you could add information from both devices too, so on one screen I could see all the things I keep checking.

I saw someone did build one but it was with a website, and more hardware then I have.

Did I miss something in the docs or is this even possiable?

TimDoring asked
TimDoring answered ·

3 Answers

BMV-712 and MPPT 100/30 configuration

I have installed the BVM-712, and the Smart MPPT 100/30. Currently I have 2 - 170W panels along with 4 Decka DC24 batteries. (specs below, will be replacing them soon)

The issue I am having is the reporting of the BVM, I believe I have the settings correct. And have done the sync SOC to 100 and zero current calibrations. But the readings are not what I think are accurate. the SOC is saying 60% yet the voltage is at sub 10V. I was told the discharge floor setting would adjust your amp hours and display to accommodate but it seems to be in reverse. Did I mess up the settings? How do I make sure its information it reports is accurate?

On the 100/30 I did "User Defined" using the numbers provided by the manufacturer but there is no setting for "Bulk" and I never see the bulk charging above 13.8 any recommendations?








TimDoring asked
TimDoring answered ·

2 Answers

How to increase communications length between CCGX and MPPT 150/60?

Newby here, first post. It probably has been asked before.

I have a Victron Smart Solar 150/60-Tr on order. Planning to use a CCGX with my MPPT 150/60.

The Victron site says that a VE.Direct cable is limited to a maximum length of 10 metres between a CCGX and a MPPT charger. My CCGX will be in the kitchen about an 18 metre cable run to the MPPT 150/60Tr. So a VE.Direct cable is out.

Is there an alternate method of stablishing communications between a CCGX and a MPPT 150/60 Tr when located > than 10 metres apart? TIA.

lopezjm2001 asked
lopezjm2001 commented ·

2 Answers

Quattro 48/15000/200-100/100 keeps switching over to inverter operation

My current system:

1 x Quattro 48/15000/200-100/100

4 x Delta Gel Batteries GX12-200 (12V, 200 Ah)

48 x 150W Solar panels

2 x BlueSolar MPPT 150/70-Tr/MC4

Color Control GX

My problem:

Just installed and connected Quattro unit keeps switching over to inverter operation all the time even under load less than 1kW.

I had the same problem with my previous MultiPlus 48/5000/70-100 about 4 years ago. Without Solar panels it worked perfectly, but right after I connected my first solar panels and activated ESS, it started switching over to inverter mode, resulting in overloading. I have weak grid in my village – rather low transformer, so that when someone switches boiler or other heating device, voltage drops to 200V and below. That’s why I installed the stabilizer (Ortea Vega 1500-15 / 1000-20 (15kVA/10kVA – 2 operation modes), but it did no help to eliminate the problem of switching over to inverter operation. What really helped was a new firmware, which you released at that time – right after updating my Multiplus started working perfectly.

It continued before Sept 2019, when I installed the 2nd Multiplus to work in parallel, because I needed more power. But I could not stabilize their parallel work, what I described in details here:

Now in order to get back to normal operation, I bought Quattro 15000, thinking that it will work as good as Multiplus 5kVA in standalone mode. But it does not. I just disconnected my perfectly working Multiplus 5kVA and connected with the same wires Quattro 15kVA. And the problem returned: I have the same abnormal operation:

Dear Victron team,

Can you help out by releasing the next firmware for Quattro 15kVA, similar to the one you released for 5kVA devices? This really solved my issue last time?

Or can you advise me anything else?

I spent so much money and time, trying to figure out what to do and tried almost everything, except direct programming and coding, going beyond capabilities of VE Config. This could really help me, but in order to do it, I’ll have to learn how to do it properly, what will kill lots of my time, which I don’t have.

I’m deeply disappointed. Can you give me a glimpse of hope?

Alexander Ushakov asked
Daniël Boekel (Victron Energy Staff) commented ·

1 Answer

EasySolar stuck in Storage mode

I own an EasySolar system comprising of a Multiplus Compact 24V/1600W/40A and BlueSolar charger MPPT 100/50 (Rev 2) fed by 4 x 250W solar panels, with 4 x 12v/170Ah Victron AGM Super cycle lead acid batteries as storage.

If I run the system in the “Batterylife” ESS option, the batteries discharge to the SOC level(s) – 80% - at which point the solar charger appears to become disabled and all appliances are left running on a grid feed.


Changing the mode to “Keep batteries charged” re-enables the solar charger, thus allowing solar to run any system load, and slowly recharges the batteries back to full capacity over a week or so. At night, any system load is met via the grid feed however, rather than from the batteries.

If I reset the system from the Color Control panel (MultiPlus Compact >Advanced >Reset), this succeeds in shifting the system from Storage to Absorption/Float and rapidly recharges the batteries, as well as allowing them to power any system load overnight.


However, after around 48 hours the battery voltage drops and the system then reverts back to Storage mode.


The batteries discharge to the SOC level, which disables the MPPT and requires me to intervene again as above.

The company that installed my system initially attempted some remote fixes, but did not resolve the problem. They now no longer respond to any contact from me.

I understand from this forum that this is not an uncommon problem, although solutions appears to be scarce. It seems that the Storage mode can be disabled via the VEConfigure set-up system, but I am not trained to do this myself, nor am I certain if this would fix this problem.

Just wondering how to get the system working properly, any advice appreciated.

KeithS asked
Daniël Boekel (Victron Energy Staff) commented ·

2 Answers

SOC going to 100% immediately

Hi i have a recent install 4 x 200 a/h lithiums, 2 solar banks x 2 controllers the battery SOC gradually creeps down overnight as i would expect but in the morning as soon as the PV are lit up by the sun the SOC goes straight from say 89% to 100%, obviously this not correct , any ideas please

Macca61 asked
Alexandra commented ·

0 Answers

3x Multiplus 2 with AC-coupled 15kWp pv


I'm currently planning my ac coupled 30kWp pv system.

I think about buying
2x 20kW Fronius 20.0-3-M with
3x Multiplus 2 5000VA inverter (one on each phase).
One fronius will be connected between grid and ac-in, the other (with max. 15kWp pv attached) to ac-out of the multis.

Will this comply with the factor 1.0 rule?
Will BOTH of the fronius inverters feed back to the grid, when the grid is available and the battery is full?

thank you!

Best regards

thom asked

0 Answers

Wire 2 Orion DC-DC Converters in Parallel

I see in the manual for my Orions that up to 5 units can be wired in parallel. I'd like to put two units (70 amps each) in parallel. Can someone look at my wiring plan and let me know if this is correct? Thanks for the help!


miami337 asked
Paul B answered ·

1 Answer

75/15 connecting to dual batt in 4x4 with optional VSR capability

Hi all, just about to set up a 75/15 mppt to charge the second deep cycle battery when the 4x4 is stationary. The battery is already connected to the alternator via a VSR is there any problems leaving the mppt connected directly to the battery whilst driving and having the battery charging off the alternator? Mppt is permanently connected to a 110w panel. Battery is lead acid. Cheers everyone.

Slim asked
Paul B answered ·

1 Answer