offgrid

Hi,

given the sunspec (modbus) support the current 3p SMAs have, could i expect an equivalent set of features and integration options as Fronius systems have already in the past ?

Hi everyone,

I have an off grid system with 6 quattro and 2 fronius with freedom won batteries. for the past two days system is going off meanwhile the battery is around 52V. when you remove the VE.bus cable from the Octogx, the system doesn't go off.

Please anyone have an idea about the problem, thank you

Hi,

in order to integrate a new CHP machine/generator (2kw on the electrical side) i need a 3 phase on that side to charge BYD lvl batteries - for that i would like to deploy a small 3 phase 'sub-grid' just with the CHP generator connected on the AC side based on 3 x MultiPlus 48/800. On the 'consumer' side i thought about a single phase Quattro 48/10000 box. In addition a few MPPTs charging the batteries from the PV side. That raised the question if a a venus system (i.e. Cerbo) can manage all of that in a consistent way ?

best regards,

Martin

Is it possible to use the register address 2705, DVCC system max charge current, or any other modbus register to control the charge current on a offgrid system? Do I need to add any further assistant?

Thanks

How can I make a 480 V 3 phase off grid system with Quattro ?

Hello,

We have 3 multiplus inverters of 3000va/48v connected in series to supply 3 phase consumption, after launching the system we face this situation:

We have alarms of overload on the 1st inverter (shows only 1600w but lunch an overload and high temperature) while the 2nd inverter was 1500 without alarm and tye 3rd only 400

We tried changing the consumption by using a resistive consumption, the system showed 1st inverter 2200, 2nd inverter 1500 and the 3rd 400 as before, then the system turned off directly

Why we have this overload problem?

Asap

Thnx

Good day,

For a complete OFF-grid system we want to have the following configuration:

a) 3 * Quattro 48V 15kva in parallel

b) on the DC battery side 12 Smart Solar MPPT 250/100 each connected to 5.5kW of panels each (total of 66.6kW of DC power on the pv side)

c) LiFePO4 batteries, 100kWh, 52V, Max cont. charge and discharge current: 2 000 Amps

d) 3 phases 60kva genset on AC 1 of the Quattro (with dynamic current limiter activated)

e) everything controlled by a Venus GX, use the two outputs to start/stop the genset and disconnect some non critical loads in case of low battery level

Three questions:

- is it at first feasible? I indeed saw so far a max of 8 MPPT connected to the DC side, will it then be possible to configure the entire solution with Victron's softwares?

- will the fact that DC charging power on the MPPT side is higher than the charging power on the quattro side be a problem?

- can i couple all quattro and MPPT on the same DC bus (each equipment will be fused protected of course prior reaching the bus) was thinking about a standard bus bar, otherwise having 4 Victron Lynx Distributor + lynx shunt + lynx Power In, but then i am limited to 1000 Amps on the bus bar (where we can potentially reach 1200)

Alternative would be to remove 3 MPPT250/100 and add 3 Fronius 5kva on each phases or 1 Fronius 20kva three phases (we might then have issues with the balancing of the phases except if the 3 quattro can correct this).

Thank you

I have an EasySolar 48/5000/70-100 with CGX, BMV, lead acid battery bank and solar panels. It is an off-grid, residential installation.

The system functions and I can see the charger mode on the CGX or using VRM. However, in trying to better understand my installation, I was wondering why the charger status LED lights on the front (bulk/absorption/float) do not light up (never have). Also, I cannot switch off the charger using the on/off/charger only toggle switch on the front.

Hi,

I' trying to find a cheaper way to maximize self consumption. Currently, I'm running an assistant that triggers a relay (at the end of the relay, I can use a water heater, air heater, whatever I decide to plugin). This is largely based on SoC and will only trigger when >98% (of course many ways to combine this).

But I have 8kWp installed and I have a 22kW bank so without any self-consumption, I only use about 4kW for charging the batteries. So this leaves me with, potentially, 4kW of power not being used. With my eyes on the meeter and the assistant, I can plug my 2kW air heater at the same time as my 2kW water heater. But I'm looking to do something more efficient and autonomous.

I know of the Fronius Ohmpilot for doing just that - outputting power dynamically, but at over 500EUR it's pretty steep, and I'm a cheap bastard :)
Any advice on what I can use on wither my Quattro or my Fronius to trigger dynamic use of over-production?

Thanks!

P.S - fully off-grid, so can't spill it into the grid.

In solar battery charger systems, the battery requires less power when nearing the end of charge, but the solar panels (or turbines) can still deliver useful power. This could be exploited for heating, cooling, pumping, lighting etc. However, most potential power consumers draw a fixed power, often more than is available, so a system will cycle or tend to draw power from the battery, depending on how it is configured. For resistive loaded (eg heating elements and led lights) a "dimming" function could be implemented to match the excess power to the load. The dimming PWM output is already available in streetlight mode.

What I am proposing is a software addition that comes into play when the battery reaches float charge. It would implement a control loop to adjust the PWM output so as to maintain the float voltage while maximising the power into the load. The SmartSolar MPPT chargers already have all the input data required to generate the control signal.

The PWM signal could drive a standard dimmer, but might also a Victron new product opportunity. For example, I have a need to direct surplus energy to an 800W 240Vac heating element in a camper-van.

hi
I want to make an off grid system
what are the advantages of Victron inverters than SMA?

urgently

Hello,

the manual (https://www.victronenergy.com/live/actor_offgrid ) says that when using AC-Thor in an off-grid system frequency shifting (PV-inverter assistent) has to be activated at the Multi.

- Is this also necessary if only DC-coupled PV is used (no PV-inverter on AC-out)?

- what are the frequency settings in the "PV-inverter" assistent? Are the default-settings ok?

Best regards

Hi, I am just trying to get my head around this and wonder if someone can confirm it please?

For a 12-15vdc battery off grid system needing to charge through a charge controller via a solar panel array of course which the panels are rated at around 55Vdcmax.

With the cheaper Ebay MPPT controllers (link to example type bellow), they cut off the solar panels inputs if the solar panel voltages are above around 15Vdc, so effectively the panel would only charge the system when the panel voltage is within the 12vdc - 15vdc, effectively only for a VERY short time in the morning and again at sunset.

With a Victron charge controller like (link of example type below), to charge the 12-15vdc from the panels (55Vdc). Does the Victron charge controller cater for the full 0-55vdc from the panel or does it also have built in cut out solar voltage cut offs, resulting in the same issue as the cheaper Ebay charge controllers?

I guess I am looking to have some device which converts the 0-55Vdc to a more usable 12-15vdc range so as to charge the batteries. Is the Victron charge controllers able to do that, regardless of the voltage from the solar panels are producing?

Kind regards

John.

https://www.google.com/aclk?sa=l&ai=DChcSEwikvN3NkZ7nAhWBjY8KHc7qD1UYABAhGgJzYg&sig=AOD64_2zKdLOh-0DDQJdeH1s63koYtHLcg&ctype=5&q=&ved=2ahUKEwipx9XNkZ7nAhVE9XMBHb87AssQ9aACegQIGxBk&adurl=

https://www.victronenergy.com.au/solar-charge-controllers/smartsolar-100-30-100-50

I'm turning a truck into a campervan/housetruck, and since I have the roof space I would like to use excess solar to run a small hot water system. I have 12x200W (40V@5A) panels, and I'm thinking 24V to match the truck. The loads will total less than 3000VA because I'm willing to use one cooking appliance at a time (I have been doing this already as a test). I'd rather ask dumb questions of online forums than people trying to make a living selling solar setups, so here I am :)

I think I want something like this: either MPPT 150/100 (3s4p, 120V strings) or MPPT 250/100 (6s2p, 240V strings) feeding a Multiplus 24/3000/70 with a Color Control GX and BMV-702 battery monitor. In Australia a Sentry 24V/150AH is $4000 ($1.05/Wh, charge at 60A) while the Victron 24/200 is $6695 ($1.35/wh, charge at 100A) and I'm not keen on spending the extra $3000 if I don't have to. I don't need the extra storage, just the extra charge current acceptance.

Hot water can be either 240V AC or 24V DC, element changes are easy. And the thermostat will cut power when the tank is hot enough.

The question is how I get the power diversion to work. I'm told it can be done but I have been wandering round the Victron website feeling lost. Please advise.

Second question: if I want to limit charge current to 60A, can I use a MultiPlus 24/3000/70 rather than needing a 24/5000/100 and program it to limit the charge current?

thanks for any help

Is there a problem to connect MPPT 150/70 and 150/60 to the same battery bank across Dc bus bar ?

Hi guys,

I am planning to install a system according to the overview below where I normally use three Multiplus inverters + B-Box 13.8 kWh for self-consumption but also for occasional emergency power.

I read the advice on the Victron/BYD minimum battery size in the link below and there was some confusion! The minimum battery size table for Multiplus 48/5000/70 Three-phase states:

• Self consumption minimum battery = 1 x 13.8kWh
• Off-grid minimum battery= 3 x 13.8kWh (my calculations give 2 x 13.8kWh here)

https://www.victronenergy.com/live/battery_compatibility:byd_b-box

I am struggling to understand if this is a requirement or a recommendation.

So my questions are,

Will this system work?

Why does Victron recommend using 3x13.8 kWh for off-grid use?

Does the battery capacity have to match the inverter maximum currents? I'm ok with not getting up to 3x5 kVA out from the inverters.

[image]

Thanks in advance! :)

Sven F

Can one bluesolar mppt deal with modules with different orintation?

I have 3 x Multiplus II 3000-48 in island operation, Okto GX, 4 x MPPT, mains power.
Hub1 should be set up, no infeed. Different configurations were tested but in all of them there were sporadic shutdowns, in a last configuration (default setting of the multinationals without assistants) there was an interruption again Message: # 1 device switched off. There was no entry in the alarm log.
In the meantime I suspect a mistake on a Multi -> but which one?
Can anyone help me further?

To anticipate it, the installer yesterday checked the wiring. From the house connection via the MultiACin via ACout to the loads, the same cable colors are never crossed. 35m 5x16mm² underground cables were laid from the house to the MultiPlus and back. Since no error was found, Ve.Configure tried all 6 ways of assigning the phases:

1-2-3, 1-3-2, 2-1-3, 2-3-1, 3-1-2, 3-2-1 for all there was a phase rotation warning if the MultiPlus tried on the grid back.

Three-phase motors have the correct direction of rotation both in inverter operation and in mains operation (manual switchover possible via switch). We have no idea

Are there rules to combine Fronius inverter ( AC coupling ) with Solar charger ( DC coupling ) other than rule 1.1 in the ac coupling side ?

Hello,

I recently installed the following off-grid system in a country house that will be used only during the weekends:

• 4 300W solar panels
• MULTIPLUS-II GX 48V
• SMARTSOLAR MPPT 150/35 48V
• 8 Acid Lead batteries of 6V each

Normally I switch on the MP II only when I'm onsite and I need power (once a week so far), during the other days I leave the MP II off. The solar panels and the MPPT are always active (see the screenshot below taken from VEConnect).

I see from the App that every day of the week, even if the MP II is OFF, the batteries are exposed to a charging cycle (bulk, absorption, float). The voltage is raised from 51V to 59V everyday.

That is the behavior suggested from my Victron and battery re-seller.

I'd like to have the confirmation from you that my settings are the best ones in order extend the life of my batteries as much as possible.

Is the daily charging cycle really needed? Wouldn't be better to disconnect the 4 panels during the weekdays and to connect them to the MPPT only during the weekend?

Thanks for your suggestions!

[image]

why does the inverter (multiplus 2400/50) switch off when the batteries are at 60% charge. And is there any way to change this?

Hi there,

I've got a system where I don't want the quattro to automatically restart after shut down (due to the nature of the system it could restart onto a fault it doesn't detect for).

Is there a way to program this in so that in any shutdown event the inverter will not restart unless manually told to do so?

Can I Connect Quattro 10 to a Lynx distributor ?

Had this fault and shut down a couple times when the attached generator shuts off, generator is attached to two 15kW Quattros in parralell. I was thinking maybe one charging circuit shuts down slightly before the other causing the remaining one to spike? Batteries weren’t full I only take them up to 45% on the generator. Any help would be great. thanks

Hello.

Is it possible to configure a low voltage 3-ph off grid system using the Quattros? That is a 230V 3-ph IT network like in Norway.

Thanks

Hi all, I would like to add a small turbine to supplement renewable energy production in the Winter (when pv naturally drops off)

It is a 48V victron system (5 Kva inv/charger with a BYD-B Box LiFePO4 10 kwhr with 4.8 kwp of DC coupled pv via a 250V/85A victron charge controller).

1/ What would be the ideal charger settings (a 3rd party charge controller) to suite 55.2V/55.0V or 56.5V ?

2/ As it is "DC coupled" an AC sensor is out of the question, so is there a way for this wind generation to be represented on the VRM monitoring (even if it shows as pv)?

Any suggestions are most welcome!

Hi,

I am a solar energy design engineer.

I have been always asked if it's okay to supply a welding machine in a solar micro-grid consisting of PV+Storage only (no back up generator).

As far as I know, the major complication in such a setting is that welding machines are very complex to monitor their actual consumption due to power factor and thus in a micro-grid it's difficult to have an accurate metering of the welding load and charge the user properly.

I need your advice if the above information is precise and if the idea of applying a welding load in an off-grid solution (PV+storage only) is applicable and have no other complications (for example, high starting currents may cause very high discharge currents from batteries during cloudy days or whenever there is pv deficit).

Thank you in advance

I am building av complete off-grid installation, using EV-batteries, solar panels, gas generator and a REC Q BMS for battery management.

Im thinking of combining this with a Multiplus 2 48/5000 VE.Bus and a SmartSolar VE.Can.

Will this be compatible? What else would i need in order to program it correctly? I am an automation engineer, but haven't worked with CanBus in a very long time. Is this a fairly intuitive system, or will i be scratching my head for weeks trying to figure it out?

Hi all, I believe my off-grid charge controller is experiencing the same issue as seen in this post:

https://community.victronenergy.com/questions/7329/bluesolar-15045-weird-behavior.html

Unfortunately I don't have a spare controller to swap out for testing. I don't currently have logging but plan to in the future. I've only caught it doing this type of thing when I'm physically looking at the unit. The system usually runs as expected but I've seen it do this several times a day to not noticing it happen for a week or so.

The watts coming from the panels and going to the batteries fluctuates from 0 to the max watts available at the time, stays there for a second and then falls back to 0 and starts that cycle again. The battery voltages rise and lower accordingly.

I've yet to see it "fix" itself or stop doing it on it's own. I stop the rise/fall/rise cycle by going into the set up menu and then back out. This resets it back to bulk and the charge cycle operates as normal. Any help would be appreciated!

System specs: 4x400w panels (1600w), 4x190ah SLA batteries (48v), firmware version 2.03.