Hi there,

When I'm running from my batteries (80kw) on the 3x MP2 10kva (3 phase) - I'm getting power overload warnings on my system at around 6kw draw on a single phase.

However if I turn on the grid, I don't get any kind of warnings and the system is happy running upto 18kw for awhile.

Can anyone explain the issue or point me to the specification sheet which shows this limit on the battery power.

[image]

Hi everyone, why is the system not using my 100% loaded battery to cover the AC Loads?

Any hints are welcomed

Hello! I have a 12V system in my RV with two 12V LiFePO4 batteries wired in parallel, a SmartShunt operating in Battery Monitor mode, a Smart Solar MPPT 150/45 solar charge controller, and a Cerbo GX with GX Touch 50 connecting everything. I also have a battery disconnect switch that currently disconnects all of the non-Victron loads in my system. I have some questions about best practices with respect to wiring each of these components and would greatly appreciate your help!

SmartShunt

I have my SmartShunt wired into the negative side of my circuit, directly between the negative terminal on my battery bank and all other loads. I have the Vbatt+ terminal wired directly to the positive terminal of my battery bank using the optional battery temperature sensor (with black wire connected to the aux terminal and configured correctly). I don't think I have any questions or concerns here. The manual is very clear about how to wire everything. This results in the SmartShunt being "always on" regardless of the battery disconnect switch position.

MPPT

I have my MPPT charge controller wired to the battery bank's positive terminal directly (always connected, even if battery disconnect switch is turned to off) currently unfused, but in reading the manual more closely, it looks like I should add a 50A fuse to this connection. The negative connection connects to the load side of my SmartShunt. Regardless of fuse, is it recommended to have the MPPT connected directly to the battery, as I do now, or should I put it on the "load" side of the battery disconnect switch, such that if that switch was turned off, no power would be able to go into the batteries from the MPPT (assuming solar power was supplied)? Or is it a personal preference? I see pros and cons either way, and don't think it would make a huge difference for me in either case, but would love to hear your thoughts.

Cerbo GX (main question)

I currently have my Cerbo GX powered directly from the battery bank's positive terminal with the supplied fused cable such that if I turn off the battery disconnect switch, the Cerbo GX remains powered up. (Negative side goes to load side of SmartShunt.) This has the downside that turning off my battery disconnect switch does not get rid of the power draw on the battery of the Cerbo GX (which appears to be ~3-5W). This has the upside of always keeping the Cerbo GX on and monitoring. My main question is: Is it problematic to turn off the Cerbo GX when I turn off the rest of my loads in my RV? This is usually when it is in storage and not in active use. While the idea of having the tracking of temperature sensor data and battery voltage is nice during storage, it doesn't seem critical to me. I just can't find anything within the manual that specifies whether it is better to keep the Cerbo GX "always on" or if it's okay to disconnect when not in use. Compared to say, the SmartShunt, which is "always on" but has such a small power draw that it seems like a non-issue. Any guidance on this would be greatly appreciated! (I unfortunately just accidentally drained down my battery, I believe in part due to the draw of the Cerbo GX, which is why I am wondering if I should remove the parasitic drain.)

Thanks kindly for your reading and assistance!

Looking for a charger with two output for charging two separate batteries, one LiFePO4 and one lead-acid battery at the same time.

Have looked at the Blue Smart IP22 Charger with three outputs. As I understand it, this charger has the same settings for all three outputs?

Any suggestions for a charger that can charge two battery banks (lead-acid and lithium) at the same time?

EasySolar charges lithium, but needs a little extra charging at times. Will also install a system (lead-acid and lithium) in another boat that does not have EasySolar.

Boating and have equipment below:

• EasySolar 12V, 1600V
• SmartShunt 500 A
• Cerbo GX
• Digital Multi Control 200/200A GX

In my set-up the 4/0AWG wires that connect the batteries to the [Battery Bank] Lynx Distributor do not feature fuses. There are fuses internal to the Lynx Distributor, but the wires are effectively unprotected until they reach the Lynx Distributor.

Of course, I’ll keep those runs as short as possible (less than two feet long per wire/conductor) but it still seems weird to me to have a wire run unprotected.

Should I have an MRBF, or similar, fuse directly on the battery terminals?

Should I be using a different fuse or circuit breaker to protect the wires between the batteries and the Lynx Distributor, or is the system safe as it's currently designed?

The wiring schematic in the Lynx Smart BMS doesn't show any fuses in that location.

The example schematic on the Victron Support site doesn't show any fuses here (https://www.victronenergy.com/upload/documents/MultiPlus-II-3KW-230VAC-12VDC-600Ah-Li-Lynx-Smart-BMS-&-distributors-Cerbo-GX-touch-generator-MPPT-Orion-Tr-Smarts.pdf).

On the other hand, this post (https://community.victronenergy.com/questions/108271/mega-fuse-arcing-dangers-lynx-distributor-li-batte.html) on the community makes me think I will need protection, if what that discussion says about Lithium batteries arcing past MEGA fuses is correct.

Dear all,
I am setting up an ESS at the moment, using a MPII and several Victron MPPT Tracker. As a battery I will use 16x280Ah LiFePO4 DIY. I plan to use NO shunt but a popular JK-BMS instead. I dived into the ESS topic quite deep; however I have still some comprehensive problems.
1) When the MPII is connected to the battery the first time, must the battery have a defined SOC, e.g. 100%?
2) if not, and in gerneral, how does the MPII measure the SOC?
3) Is a shunt necessary even when a BMS is used and connected to GX?

Thank you very much in advance!

Best regards, Josef

Hi !

I have installed a few days Lifepo4 Batteries in my vessel. 2 each 400 Ahm drop in batteries each one with its own BMS. Tewaycell, with bluetooth in the BMS. I can see all the parameters inside.

So I'm searching for some answers, I guess they are easy, but Im a little confused. if you please:

1º Lifepo4 are like litium batteries ( laptop, cellphone..)...in the way of , Are they must kept under 60% to extend their live? The thing is, they were delivered near 100% of charge. But I don't need that capacity for the daylife, just for emergencies (a long trip in the ocean). I bought this capacity because it was cheaper than 300Ah ones and available.

2º If 1º quesion = YES, in all my MPPTs (there are 4), can I set them to archive the 60% and stop chaging?. Maybe setting Absortion and floating voltage below, maybe 13.2 , or both the same?

3º If 1º & 2º are ok, Do you know if the victron battery chargers 220ac/12v, has the feature to stop to charge batteries up to the choosen SOC?. Mine has no even a Voltage absortion/float or anything to set and reach a certain SOC

Maybe this questions have been answerer somewhere, all and over gainbut I would wish to have a confirmation, because I read something but Im not sure

Thanks a lot

Sorry if this question is somewhat amateur, but I'm rather new to this ....

In the following scenario I have:
- one 5 W / 240 V LED bulb connected to a 240 V inverter (5 / 240 = 0.021 A)
- one 5 W / 12 V LED bulb connected directly to the MPPT (5 / 12 = 0.42 A)

Do you agree my calculations are correct; does this effectively mean the 12 V solution places a greater load on the battery and will consequently deplete the battery more quickly than its 240 V counterpart?

Best regards

Hi I'm designing a solar setup using 5kw of solar and a multiplus ii.

I have the multiplus, charge controler and panels etc coming next week. However battery is on order and will be minium of 2months.

Is there a cheap temporary battery anyone suggests. 48v....

What's the minium requirement for multiplus to function. Could I get 4 tiny 12v batteries and use them in series temporarily?

And if so any suggestions or will I just have to be patient and sit with panels in the garage not generating?

Thanks Matt

Hi

I wonder if VIctron , or other third part, has implemented a diode bridge, like a rectifier bridge used in every power supply from AC to DC, but used for other different purpose: to isolate two big battery banks?. Or they are thinking on it?

The question came up because some battery LiFePo4 makers, has a limitation of 4 units in parallel.

We have in a catamaran 2 banks ,one 1200ah , 4 cells, and the other 800ah, 4 cells. We can not put them all together because that limitation. So every bank has different and separate MPPTs, chargers etc, and we can not get it all for all the bank. And besides, the loads are divided between one and the other bank, so there is an asimetric discharge.

But If we put that diode bridge between then , both banks will act as they were two to the same load, and two for all the different sources. But finally , we will got all the capacity together , and not separate.

The bridge can be done with 2 argo fet, one input (all the sources) -to-two ouputs, and conected, to the two inputs-to-one output ( the loads). Each battery bank would be connected to the other 2 conectors, meanwhile the two outputs are connected to the two imputs

[image]

THe thing is Argos are limited to 180A, and we will need at least 250A. And besides, we want to get one integrated component, rather than 2 and wire between them.

With this bridge, both batteries are getting power when generated, but they are not galvanically connected. They will act to each other like they didnt stay there . If one is having more than the other, the former is not going to transfer power to the sooner and biceversa. Besides the bridge will ecualize the Voltage and the power to both. The same with the loads.

To have this working , we need a low forward voltage, as argo fet has, with very low, less than 0,1 v. If we use a common rectifier bridge, the voltage would be around 2v or more, so it is too much

Any idea?

thanks BR

First I had with ESS trouble that charging and discharging changed without sense at a SoC level of about 85%.
I changed configuration of MPPT charger to „Scheduled Charging“. So fare charging works now up to 95% as preset wit VE Config.
But discharging ends already at 92% despite that i preset 40% as minimum SoC. I meantime changed Optimization with BatteryLife to without.. But the didn‘t solve the problem.
All i want is during day use of exceeding solar power at in night times discharging of the 300Ah battery.
What is to change in configuration for that?

Hello,

I am using a Victron Smart Shunt (aka Battery Monitor) feeding battery data to other components in my setup (e.g., MPPT charger). Please see my first two setup photos. I recently learned how to have my EG4-LL (version one) batteries to communicate with Cerbo GX (photos aren't showing the communication cables between batteries and Cerbo GX). As you can see from the other photos, I now have two Battery Monitors in my setup. Should I remove the Smart Shunt (it seems the battery communication has more data included, so I should keep that and remove the Smart Shunt)? I also like to know, if it is safe to have two Battery Monitors in my setup. It seems the Smart Shunt is reporting higher SOC value, however the reported charge current and voltage values are similar from both Battery Monitors (see photos, which are captured at different times). Thanks in advance for your reply...

[image]

[image]

[image]

[image]

[image]

[image]

[image]

[image]

[image]

[image]

Bonjour tout le monde, j'ai une installation avec deux Smart Solar 250V-85A, un Multiplus II 5 kVA-48VDC_230VAC et 16 batteries lead-acid Rolls 445Ah-6V. Je remarque que quand les controleurs de charge indiquent Float, sur le cerbo GX il est indiqué que le SOC est de 78%.

Pouvz-vous m'aider a trouver une solution ?

I am trying to achieve a power balance for my system. However, i often find that the power balance is achieved when I consider the VE_Bus_charge_power instead of Battery power and PV-DC power. How can I understand the significance of values given by VE_Bus_charge_power.

I tried to compare those values with the power from PV and the Battery charging/discharging power; however the values for quite different. The difference if much more significant during the no-sun hours (i.e. when the PV is idle). More here. https://community.victronenergy.com/questions/180770/power-balance-of-the-energy-system-what-si-ve-bus.html

I am aware that the AC Consumption values from the VRM Portal are calculated values. I would like to know if this somehow defines the values in VE_Bus_charge_power?

Any leads will be highly appreciated. Thank you!

Screenshot from VRM for my installed system:

[image]

I've got a DIY Lifepo4 battery bank that I'm going to be installing in a somewhat unique fashion. I have 16 304AH 3.2v cells that I'm going to put into a 12v bank with 4 cells in parallel then series those groups for a 12v bank. However the unique part is I'm going to install the 4 cell in parallel into a battery box so if they need to be removed from a camper van it's manageable weight (ignore the series busbar connections as I have matching flexible busbars on order). The BMS is going to be a REC Active BMS so will be external to the battery boxes.

[image]

[image]

My question is the first photo. Per wiring unlimited, it says to wire parallel strings in one of these suggestions:

[image]

Since the "load" is going to be the battery box terminal, would there be any benefit to running a wire from each cell or would that not matter since I already have a bus bar? Just go with option 1 (Diagonally)?