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Is the MPPT 100/30 suitable for 5x 120Ah lead-acid batteries connected in parallel? All batteries will be of the same type and new.

If yes, what should I keep in mind?
What is your recommendation for 600Ah?

Why 5x 120Ah? Because they currently have the best price performance.

Hi All,

So this has got me stumped :( I have tried everything else that could possibly cause this issue but think it may be my setup with the charging. So here’s a summary:

I have a 36v Ezgo golf card which previously ran on 6 x 6v Trojan Lead Acid batteries. As a company we have recently got into the solar field so wanted to "experiment" with converting the cart to Lithium batteries as a side project. After quite a bit research I settled on 3 x 12v 108Ah Blue Nova Mobile batteries in series (https://bluenova.co.za/wp-content/uploads/2019/03/BN13V-108-1.4k.pdf).

To cut a long story short we did the conversion and it works brilliantly. Then came the issue of charging. One option would have been to use the 36v charger I already had for the cart. However, my concern there was that the "charging algorithm" on the charger was for lead acid. I did some research on Lithium chargers and found one expensive 36v option. I then got chatting to my Local Victron dealer and he suggested I use 3 x Blue Smart 12v (25A) chargers and install them in the cart permanently wired up to the batteries. What I liked about this idea was that I would be certain that each battery would be charged equally and would never get a battery imbalance (and it worked out cheaper) 12 So I went this route….

Fast forward 2 weeks – cart is going great, no issue and then suddenly battery 2 & 3 turn off (being battery 1 connected to main positive and battery 3 connected to main negative) 1 i.e. the internal battery BMS shuts off… I have gone through COUNTLESS different theories on what could be the cause (from parasitic drain, to wiring etc) but at the moment I’m wondering if the following could be happening (but need someone VERY knowledgeable people to prove or disprove).

So could the following be happening?:

1. Battery 2 and 3 discharge just ever so slightly more than battery 1 during use (as battery one is connected to main positive and batter 3 to main negative).

2. Then during the charging “somehow” the three chargers pick up on when the first battery is full (battery 1 in this case) and then all three chargers move to the next charging phase (say from bulk to absorption).

3. This leads to battery 2 & 3 losing out on just a little of a full charge each charge cycle.

4. In my case the cart is used daily and uses about 30 % in a day. After about 2 weeks maybe that “ever so slight” loss on every charge cycle drops the battery to a low level and the BMS turn off the battery to protect itself?

5. It is a “theory in progress” as the batteries where turning off every few days until I separated the 3 batteries, charged them, put them back in series and then for the past 2 weeks it has been perfect (until yesterday when they shut off again). So last night I separated the batteries again, charged them up and ill see how long they last.

6. So in summary, I suppose what I’m asking:

a. Can you use three of the Blue Smart 12v (25A) charges on 3 x 12v batteries connected in series (i.e. one charger connected to each battery)?

b. In such a setup would they in any way affect the operation of each other?

As a last note, I did install a BMV-712 Smart BUT because of the way the chargers are connected directly to the battery the “input” from the chargers cannot go through the shunt. So its set to reset to a full state of charge at a certain voltage (approx. 42v). This has helps me see what the parastitic drain is (approx. 0.01A) which I think is acceptable. This was verified with a clamp meter.

Any other suggestions would be appreciated 12

Thanks,

Richard

We have a battery pack (2x 12V 110 AH PbCa) for Engines and a second battery pack (2x 12V 110 AH PbCa) for service on our motor boat (34").
All our circuits (engine start, lights, electronics...) are in 12V.

We plan to install two 115 W Blue solar panels on the roof to maintain batteries fully charged when we are not on board (if we are on board, the batteries are charged by the engines).

Our shipping area is from Britanny and Scotland, with a quite low solar illumination (!)

What is the optimal solution ?

- Use of two separate MMPT regulators (and 1 solar panel / regulator / battery pack) ?
- Use of Blue solar PWM DUO charger (and the solar panels in serial or parallel) ?

- Another more optimal solution ?

Thanks for yr help and your experience.

Regards

Hi there,

I have recently doubled my storage battery from Pylontech US 3000 (3.5kW) to 2x US 3000 (7.0 kW

I am running MPPT 150 / 45 Solar Controller and Multi Grid 48V/3000VA/35Amps Inverter / Charger.

The displayed charging current and Wattage seems to be that of only one battery as it does not compute up to the display on solar yield vs consumption.

I have connected the data link from Master battery Link Port "1" to Slave battery Link Port "0"

connection to Venus GX is from "CAN" port

Any advice please

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HI. I bought an Victron Phoenix Inverter 24/800 and none of the manuals that come with the inverter or that I can download, shows where I can bond neutral to earth.

The only way that I can see how to do it, is to move internal earth wire to neutral on output board. Would this be acceptable to do as it looks like there is provision made for it do be done.

I have attached some pics of output board.

Thanks

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`Hei

I frequently use remote control in my ccgx. This has been working fine several year. Last week the remote console in vrm connects to my ccgx, asking for my password... when I type, nothing happens. I clearly have connection to the site, and data logging is working correctly. When I arrive on site, I access on lokal network... and everything is working fine. I have runned update, different browsers and reset everything. anyone experiencing something like this? I have not changed internett provider... everything is the same :-(

mvh vegar bartnes

Hi,

it would be nice, the everyone can choose if he would use the limiting to 52.2 Volt when using Pylontech batteries or not. A simple switch to yes/no would be nice.

See: https://www.victronenergy.com/live/battery_compatibility:pylontech_phantom#my_system_only_charges_the_battery_to_52v

I thought the battery-icon with bars was in direct relation to SOC.

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Just got in the solar game and am hoping to get a head start on how to wire and program different systems using VE config and MK 3 etc

Are there any detailed tutorials that demonstrate this ? Also would like to know how to wire up a switchboard, thanks in advance guys

Good morning chaps,

I am just after a bit of help/advise. I have just finished installing a Victron Multiplus in a motorhome conversion. It is installed alongside a 70a MPPT solar controller and all are wired to a CCGX. I recently upgraded the firmware in the CCGX as the multiplus and ccgx were previously in a household setup and they have been stored over a year since I purchased them used.

The MPPT shows in the CCGX via the VE Direct cable and that shows fine, showing the solar input, battery voltage etc.

The issue is that the CCGX does not show when the Multiplus is turned on, it shows a symbol for a Multiplus but it always shows off, even when the inverter is on and powering appliances. The Multiplus is connected using one of the blue bus cables to the VE BUS input on the back of the CCGX and I have tried it plugged in to both connectors in the Multiplus but nothing shows up as working. The Multiplus also and has a temp sensor that is connected from the Sensor connection in the Multiplus to the negative terminal of my battery bank (this all came as a used setup kit other than the mppt).

Should it be a case of just plugging in the blue network cable in both the Multiplus and CCGX and it should all display as connected and working? I presume I am correct with the temp to the negative?

The setup and install is pretty much complete, I just want the Multiplus to show on the CCGX as everything is getting boxed in very soon so wouldn't want to have to rip everything out to change a cable etc....

Attached is a pic of the CCGX, I can take more pics of the back and cabling if required.

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Can anyone help out here with some info or advise to get the Multiplus showing on the CCGX?

I shortly be installing a 8000kva Quattro, 250/100 charge controller, Pylontech batteries and a Venus GX. Do I need the MK3-USB cable to adjust the settings?

Thanks Tony

It would appear the Consumption data has stopped displaying after the 7th October. Everything else seems to be working.

Hi,

I have quite high voltage from our grid (240-244V) and was wondering if the Quattro filters the grid (like an online UPS) and has steady 230V sinus on the ACout? Or is it just bypassing the grid, other when inverting ofcourse.

I will be connecting a fronius inverter on ACout and lower voltage would help the voltage drop of the 75m AC cable.

Kind Regards

Apart from the VE.Bus cabling, which software has to be loaded onto the Multiplus 2 inverters before outputs can actually be connected to each other?

Yesterday I tried updating the firmware on my Multiplus II 48/3000/35-32 (then on firmware 459), using VictronConnect 5.11 on macOS Mojave (10.14.6).

This is what happened -

• There is a Venus GX plugged into the Multiplus II, and I plugged another UTP (RJ45) cable into the Venux GX as it was easily accessible. I initially only wanted to change the charging efficiency setting on the Multiplus II.
• I saw that there was a firmware update, and followed prompts in VictronConnect to update. I was still connected via the Venus GX - correctly / incorrectly, I don't know.
• The update failed with Victron Connect saying it lost connection to the Multiplus - for a short while a combination of LEDs was flickering on the inverter, and then it reset itself (or something) and was working again.
• I took a short time myself to recover from my own kernel panic.
• I realized that veflash asked you to connect directly to the inverter, and not to have anything else connected. So, I disconnected the venus gx, connected directly to inverter via the mk3.
• I tried the firmware update again - to v463 - and this time Victron Connect crashed on the mac. The inverter just had the "bulk" LED on.
• I had another kernel panic myself. After a while I switched the inverter off, and on again - and it was fine.
• I decided that this was enough fun with Victron Connect on mac, and updated via veflash to 2628465.vff - successfully.

I am not sure what the issue is with Victron Connect, but I did not try updating the firmware a third time...

I have been testing various converter setups to charge 2 6V AGM batteries connected in series. Total capacity is 225Ah, Peukert exponent = 1.12. I discharged the batteries to 20% state of charge, then connected the converter and monitored battery voltage, charge current and SOC as reported by the BMV-712. I also calculated the state of charge using the Coulomb counting method, assuming a charging efficiency of 95%. I would have expected my calculated SOC and the SOC reported by the BMV-712 to match, but they don't:

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The BMV-712 SOC reads consistently high and reaches 100% while the converter is still in bulk charge mode. My calculated values seem much more reasonable and believable. Interestingly, if I set the charging efficiency in my calculations to 120% (crazy, I know) then my calculation of SOC matches the BMV-712 exactly.

Anyone any idea what is going on here?

I would like to install 3 of the new 200Ah Lifepo batteries in a parallel setup. The Documentation asks to have each string fused per battery. Usually i would go for simply interconnecting the batteries with well dimensioned short length cables and have one fuse for the complete battery bank. The simple way would save me space, save transition resistance, less failure points etc.

Is there any special reason to have each battery fused individually or is it "just" the way of the very lowest risk.

Any advise is appreciated :-)

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Before the MPPT regulators from Victron had a problem with switching too early from BULK to absorption, causing the "count down timer" to start and never bring large lithium ion packages to the set absorption voltage before switching further to FLOAT.

This however was fixed in the firmware 1.42 and later firware releases. Nice!!

But I experience some of the same problem with the automatic EQUALIZE setting.

To periodicly balance my lithium ion batteries correctly, I have programmed my MPPT to do an automatic equalize to 28,70V every 7 days. I have chocen these obtions:

Equalization current percentage : 100%

Automatic equalization: every 7 days

Equalization stop mode: Automatic, on voltage

Maximum equalization duration: 7 hours

When I check the history page of the MPPT, I realize that the regulator has charged up to 28,60V instead of 28,70V in equalization mode, and than left the EQ mode. It should charge to 28,70V. (The maximum eq duration had not expired, so that is not the reason)

Of course I could use the "Fixed equalize time" mode instead, but the fixed time does only provide a fixed time in EQ mode, not a fixed time at the set eq voltage.

Victron, I kindly ask you to do one of two:

Either:

Create an equalization obtion where one can choose a fixed time for staying in EQ after reaching the set EQ voltage (like the absorption works today)

or:

Make an adjustment so that the MPPT actually equalize charges all the way up to the set EQ voltage (and maybe keep the voltage there for a few minutes) before switching to float when in the "automatic, on voltage" stop mode.

Afternoon!

We've had a MPPT 100/30 fit on our boat for three months now, alongside 2 Victron 115w solar panels and had no issues. We also have several Victron 110ah Batteries. We noticed today that the solar wasn't coming in from the app even though the sun is out.

The bulk light is flashing and on the app it says the battery state is Off. Previous it shows its on Bulk.

We've done nothing different from yesterday to today, and the app was showing some solar this morning being drawn for three hours and then nothing?

Is there likely an issue with the MPPT or the connection to the batteries?

This is a brand new unit. With input voltage between 21 and 24.3 I get an output voltage of 19.4 +/1. The ground is solid all the way back to the battery. I'm baffled. Looking for guidance.

Thanks

The Venus GX has only one ethernet port. I am using it to keep my Venus GX on net via a router. I also want to connect the Venus GX to a Raymarine MFD using this method. How can I achieve this?

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Hi, when I plug this appliance in it doesn't work. A soft clicking noise is heard (from the plug) even with no load on the charger. Interestingly when there is another appliance in a second socket (in parallel to first) it's power led goes on/off with a period of about 1 second in time with the soft clicking.

The battery charger worked in a vehicle 12V socket.

What do you think?

The place I have my battery doesnt have room for the BMV shunt and cables.

I can connect it 1.5 meters away.

Would this be acceptable?

Hi all,

I want to use a raspberry as the venus device. I want to connect my MPPT 100-50, BMV712 with the VE-Bus and my Multiplus with the MK3 Interface.

But I want to use the normal remote control the digital multicontrol 200/200a too. Is there a way to connect all 3 devices (multiplus, multicontrol and MK3) at the same time ? As far as I know all three divices have only one RJ45 connector.

Thanks for help

Hoagie

I don't see any firmware update version on my mobile but my technician who installed the system does see it. Note that I get all the rest of the information, (current status, historic, etc..). How I can get these updates? I have 2 MPPT 100/30 + BMV-712 as a system.

Hi. My daughters house is off grid. I am re-doing her power installation.

She is off-grid, there is only solar, batteries, inverter charger and the 12Kw Generator.

My concern is, that if the Phoenix completely fails, there is no way of connecting the generator directly to the house. SO I have bought a 2p2t rotary cam switch, and want to connect it as a 1-0-2 where the common tap from generator goes to :

1 takes gen power through the inverter in passthru mode like now, but
2 takes gen direct to the house.

BUT in the 2 mode, the wires will still be back connected to the AC Output terminals, so generator power will be present at the AC out terminals....is this a problem?

Just installed a Multiplus 24/3000 and have powered up the system on a few short times to determine the status and resolve the faults. I do have the mutiplus on with com unplugged but the battery switch is off so NO power to the battery. Yet have turned on the BMS switch many times to determine system status. One being had to load the BMS app. Then reset and got this when I checked the battery via the blue tooth app. How would I go about clearing this fault and any idea how this would occur ?

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Hi, I'm getting some worrying behavior from my set up today. Not something I've seen before. It's a mixed day with clouds and then full sun.

When overcast everything seems normal.

When the sun comes out the PV wattage jumps right up and the battery voltage spikes to about 14.65 volts. Then the wattage then immediately cuts right back to 1 and the battery voltage reduces to 13.3ish. The watts and voltage then jump up and rapidly max out again, and the cycle repeats.

It is doing this in both absorption and bulk mode. The absorption voltage is set to 14.4v and float is set to 13.67v.

My equipment is:

• 100/20 MTTP
• MTTP Control
• 200w 24v Victron Panel
• 100Ah 12v pure lead/carbon battery
• BMV 700

Having done this all morning - rapidly fluctuate between 1w to 130w PV and 13.3v to 14.65v battery in both absorption and bulk modes - it's now stable in float at 35w and 13.64v.

Is this normal?