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Battery voltage limit

We have a couple of Multiplus v2 5k, a 5k AC coupled Fronius, 4 BYD b-box LV 48v batteries and a Cerbo to tie it all together.

Now I want to limit the charging voltage on the BYD batteries from 58.4 volt to 56.4 volt. According to Will Prowse this will greatly increase battery lifetime. Please correct me if I'm wrong.

I have no idea how to do this. In Venus OS, the CVL option under the BYD parameters is not changeable. Do I need to do this in the BYD software somehow?

Thanks in advance,


yagu asked
nickdb commented ·

3 Answers

Pylontech with MPPT and Phoenix Inverter possible?

I would like to install some solar panels on the roof of my garage. They collect power throuhout the day, and I can charge my electric car during the night. In case the stationary battery is empty it switches to grid power. Charge power will be 2kW only.

Please see this plan for details:

Is it better to use a Multiplus here? Can I limit the charge power to 1 A and switch to grid also if the battery runs low?

According to the comments on this page a pure Phoenix inverter is not working here?


Thank you very much for your comments!

mallkuss asked
Nicola answered ·

6 Answers

Polarity protection for mobile multiplus

Hello everyone,

the manual states(Multiplus 48/3000), that the Phase from the Grid should be connected to the Phase-In from the Inverter. Due to the mobile usage of the Inverter, the Inverter shall be connected to the Grid with a Schuko plug However the right plugging of the schuko plug is not always ensured, because you can plug the schuko plug in two ways (Not turned Phase to Phase, and turned Phase to Neutral). Does somebody know a device, that stops the current from follwing when the device is not connected properly?

Cansin Sari asked
mikewochner commented ·

2 Answers

Total Multiplus out put (AC and DC) limited to BMS charge limit

Victron Multiplus limiting total output to SOK 48V 100ah server rack battery (16 cell Pylontech BMS) charge limit.

System is off grid with 3kw of Solar and 20Kva Generator for backup. Cerbo running v3.00-22 also tested with v2.93

I have 3x Multiplus-ii 5000 with a set of SOK 48v 100ah batteries commanding a charge rate of 95a (well below the 210a max available from the Multis when charging via generator) that's great, I'm happy with the 95A however when I place a 4kw AC load on the charge rate of the battery goes down to about 1100w or 20a. Still giving a total output of the commanded 95a.

The generator is only running at 25% capacity so it's not a genny issue.

The way I understand is that the Multi s should be providing the 95a in DC to charge plus an additional 4kw to the AC load?

Now, if I remove the load the batteries continue to charge at the low 20a rate. Turn off the Gen and restart full 95a to the batteries again until a load is applied.

Current limit by switch is off on the Cerbo and each Multiplus is set to max charge rate of 70a.

Any ideas why total max output (AC and DC) is limited by BMS charge limit?

haig asked
haig answered ·

4 Answers

Multiplus II 48/5000 configuration help

Hi, I need some help to clarify my mind with the installation of Multiplus II .I' m concerned about the possible feeding back of grid if I connct the Grid to AC in of multiplus . I searched on manuals and also tried with VE Configure to find a solution but I was not able. Can I set in some way the Multiplus to act as inverter to feed the loads and only get power from the grid when batteries are lower than a set SOC/Voltage? I will avoid the use of Multiplus in parallel with the grid since it does not seem to support the CEI-021 standard that requires external devices. Any help higly appreciated.

giampaolo asked
giampaolo commented ·

2 Answers

GlobalLink 520 Uk coverage

I’ve just ordered a GlobalLink 520 for remote monitoring of my boat solar but can find a difinitive map coverage for the uk. Mainly Gloucestershire.

Has anyone got one in the uk?

Simon Coram asked
fermont commented ·

6 Answers

Off Grid VRM Dashboard generator consumption not clear

Hi Victron hive. Why do I get two different values for generator kWh in system overview and consumption on the VRM?, and if the AC input & output are not used, why are they shown? TIA :)



stad asked
Johnson Lee commented ·

2 Answers

Battery or load priority in off-grid setup

Hi dear community,

I am designing a DC coupled off-grid system with PV+Smart Solar MPPT charger, Li-ion battery, Multiplus II and Cerbo GX.

Could you please tell me if by default VIctron has a battery charging priority in off-grid setups or load supply priority? If so, what is the SOC setting below which the priority is given to charging the batteries?

For example, what will happen if my battery is at 40% SOC and the PV generation is enough to cover the load? Will the system use the PV power to charge the battery or supply the loads?

Thank you in advance.

khachatur asked
edclarke commented ·

1 Answer

Which Off-grid inverter starts at low input and has general low consumption?

Hello everyone,

We are building a small house in Holland and going completely off grid. As we talk to other people that live off grid it becomes clear that the challenge is surviving the winter. We are currently looking at a victron inverter with 2 separate MPPT's (to be able to split the 6 solar panels in 2 groups) and two batteries with 4kwh storage. Since we will have a small house we won't be able to install more than 6 solar panels. We are aware we will have to adjust our life to what we will be able to collect and store. That makes it even more crucial to have a well working system that uses as little as possible energy to convert from DC to AC.

There will be no other input than the solar panels so we are looking for a inverter that will start inverting as soon as light hits the solar panels. I understand that there are inverters that take a certain input amount before being able to convert. I am hoping someone here can give me a better understanding of how much that is and which inverter has a low start up.

The concluding question is which viltron inverter would be recommended in our situation where we want it to start at low input and also has a general low consumption.

Looking forward to your input! Thanks.

amrit asked
michaeld answered ·

6 Answers

Quattro 48V-8000VA Off Grid - additional AC supplies connect

I plan to add further supplier sources to my of grid System: 3x Quattro 48V-8000VA with Pylontech Batteries 40kWh behind. For continuous feed I would like to integrate a SkyWind Micro - Wind mill 1kWmax connected to the 52Hz off grid environment.

The FuSystems SkyWind is able to drop the AC power if no loads are connected.

The power is provided by a 60Hz AC connection in the micro grid while dumping the power into a heat sink when no loads are connected. In between a 60V DC to AC conversion is done.

Question: Does the Quattro AC output provides an adequate (grid like) stable frequency and 1-phase voltage to the SkyWind AC-Converter/Controler (needed to simulate an on-grid / without feed-in situation)?

Is the Quattro’s AC frequency strong enough, concerning the consumer sided behaviour based on active loads or no power consumption situation to indicate the heat sink or AC power provisioning ?

Does the Quattro provide preventions to consume itself the AC power on the micro grid side?

It seems a simlar control as been established with “Fronius PV Inverters” on the AC consumption/ micro grid side, which in fact has to be configured in a special setup.

khwf asked
cristimv answered ·

2 Answers

Charging Behaviour of a fronius primo configured with a quattro off grid

In the documentation detailing configuring a Fronius Primo using frequency shift there isn't much information about system operation when installed offgrid. It seems to be for ESS.

We have a 48 - 8000 Quattro configured (at present) with 2 charge controller mppt's, 15 KWh storage and a cerbo GX.

We want to add additional panels and a dual mppt ac string inverter like the Fronius Primo or SMA etc.

If the system requires no power from the Fronius or SMA part of the system, will the frequency shifting work normally with no grid connection?

esusa asked
scraggs edited ·

2 Answers

EV charging station in off-grid setup

@Lucian Popescu (Victron Energy Staff) I have specific questions from a prospective customer.

  1. Does the EV charging station work in off-grid systems without ESS? (documentation only mentions GX device and not ESS)
  2. Does the scheduling feature apply to and work in the same way for both ESS and non-ESS systems?

PS - Nice to see some of the latest features that has been added.

ejrossouw asked
Lucian Popescu (Victron Energy Staff) commented ·

0 Answers

Victron system in combination with dynamic pricing?

Hi all,

I'm new here and tried to search for the question above to no avail.

In the Netherlands it is possible to get a electricity contract based on dynamic pricing on an hourly basis (1 day forward). I'm thinking of a system where I charge a battery during very low pricing using net feed in and discharging during peak pricing (morning and evening).

Is it possible to set times where the battery will be charged with net feed in? For example 2pm if the battery is below let's say 80% SOC?

Is it possible to set timed activation where my home goes "off-grid" during peak electricity price (morning and evening) and switch this off at 10% SOC?

I've scanned the "Smartgrid II" manual for timed activation/deactivation but couldn't find something that resembled this fucntionality.

P.S.: what topic is this? offgrid doesn't seem to cover it?


EDIT: see as a data source for 1 day ahead "planning" of dynamic electricity pricing in NL.

jeepee asked
Christian Butterweck commented ·

5 Answers

Inverter mini power cut / power loss for seconds / Ups not working

Good day,

I have a 25kva Generator running a 10kva Multipluss II with 10kwh of battery capacity.

the system has been running ok unto Christmas, (4 weeks)

I have tried to replicate it by starting and stopping the generator and under different loads,

however it seems to happen without any 'Trigger'

I have attached the Excel file showing when the power blip happens i have a loss of data on the Logging on VRM Download.

the generator is used to power the home and when the builders come in the site as well,

however it is only connected via a 32a plug, (and its been working with a current limit of 30a set)

i have the issue sometimes were the ac input is not accepted, even when it is at 52hz and at 233v, however i have linked this to when i do a ve config upload, i have to re-set the ve bus to not have this issue.

batteries are bms connected to the cerbo, and they don't have any issues i can see, I have tried to run the system without the bms connected as well. and have no issues except the 15s power blip, which is still random,

any help would be appreciated, (the attached is all i have been able to get to prove it happens, prior to this I didn't really know if I believed the client)

time today 08.01.23@ 15.41

gen snip 1.PNG

gen snip 2.PNG

gen snip 3.PNG

gen snip 4.PNG

Matthew Deal asked
nickdb commented ·

2 Answers

41' Boat Upgrade...Need Advise

My wife and I took the plunge and bought a 1984 Roughwater Trawler for live-aboard (Semi-retirement). It needs a major upgrade when it comes to the electrical side of things that's for sure. So far I have made a list of the upgrades I'd like to make.

MultiPlus II 12/3000

Orion-Tr Smart 12/12-30A (360W) Isolated DC-DC charger

Victron SmartSolar MPPT 150|70

Lynx Distributor

Victron BMV-712 Battery Monitor

Smart Battery Protect 100A

Galvanic Isolator VDI-32

Cerbo GX

GX Touch 50

6x 200W Solar Panels

3x 200Ah AGM Batteries

Now the List that i'm going by currently is from 3000w INVERTER | 400-600Ah | 400 TO 1200W SOLAR-CAMPER by website. I have noticed some wiring diagrams with a battery Isolator and some without when it comes to the Home battery and starter battery. With me using the Isolated Orion do I need to get the battery isolator as well or no?

dirtdiver1977 asked
dirtdiver1977 answered ·

3 Answers

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