As we can see, the best inverter efficiency we get at about 50% of the whole Inverter Power (with a MP2 3000 it's a range from 800W - 1600W)

VRM Portal and Weather forecast in mind, exist a project that can dynamically limit the inverter power, to get the most efficiency (DC to AC) out here?

Efficiency AC/DC Inverter:

https://www.victronenergy.com/upload/documents/Output-rating-operating-temperature-and-efficiency.pdf

After absorption charger goes to storage. But not with a <float voltage, with a higher one! So accoring to the BMS of the Lifep04 battery SOC is always 100%. Any ideas as to what might be the cause of this?

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Hey everyone. Total noob here when it comes to electrical systems and winter storage of batteries so if these questions are simple for most I apologize for my ignorance in advance. I had a Promaster converted for me. It uses the Victron system with a couple volthium aventura series 200 amp hour batteries. I was storing my van for the winter so I reached out to the company that did my conversion and asked the best way to store the batteries if I was not going to be using the van in the winter. He stated I should pull them out and store in doors, which I did. I turned off the main power switch and turned off the charge from van while driving using the app on my phone. However, when I did that it told me it should only be turned off during maintenance. I am just wondering now if turning that off on the app and removing the batteries for the winter was the right thing or if this is going to cause me problems in the spring when I prep the van for use. If it is ok to remove the batteries should they be kept on a trickle charger or are they ok to leave sitting?

Hi,

I am about to order 2*280-300Ah bats(lets call it PRIMARY battery for short)., but was thinking about more yet, there is no space for that much weight in single area of small caravan. Initially i was thinking about getting 2*460Ah, but it just wouldnt work space/weight wise for vehicle.

Lets say i would like extend PRIMARY field anyway, and would find other place for batteries on other side of vehicle(basically on opposite site of axle) distance between batteries is 2m and lets say i would be going for additional 460Ah later on, lets call this one SECONDARY BATTERY - i suppose function of this battery is just additional STORAGE, dont need to be use and only function is to charge other battery, but must get charge also from PVs..

Now question how we connect this together if i would like to SOCs(2) be able to charge all those batteries from PVs and also i can use them with ease?

For this b2b charger (now please pardon me as i have no idea how technicall b2b chargers works and how they are used) can be used, but that works only one way? i mean what i would need is kinda switch which can disconnect battery from other once i dont wanna charge discharge happend, set charge SECONDARY->PRIMARY and plug SECONDARY into charging from PVs. But technically and safely to do so i have no clue, but there might be someone who did smth like this.

I have three 200ah batteries that have never been used. I have been storing them in a climate controlled storage. Should I be charging them periodically or are they okay to continue without any additional upkeep? What could I charge them with if that is needed? Thank you!

Hi there.

I have an annoying issues with my Multiplus.

On my boat, I have solar and shore power (230v) available to charge the batteries. Sometimes when the solar has been charging the batteries in bulk, the batteries are around 13.1-13.6v. The multiplus is turned off when the solar is charging. Then when I turn on shore power and the multiplus, instead of continuing to charge in bulk, the Mutiplus goes into storage mode.

The only way to get the multiplus into bulk is to force a system reset. Is there anyway I can fix this?

Thanks.

I’ve recently had a self built camper van stolen with all victron equipment installed is it possible this equipment can somehow be tracked

Hi,

I am tryting to find some info on our setup. We are building a system that includes 3 x 2 Tesla batteries. The system is set up for 48V with individual BMS for each 12 cells.

I have the victron Multiplus II GX for charging and discharging the system. I am reading through the ESS guide but would be nice to know if anybody else has tried this setup before and could advise on this.

Thanks

Hi everyone,

I have a Cerbo GX installed in a remote system which includes a Multiplus, a few solar chargers and smart Lithium batteries. I have Venus OS Large installed and use Node-Red for some automation.

In general it has worked well and has accomplished what I need. But recently I have noticed some strange behaviours with the Cerbo not doing or reporting what is expected in certain situations.

In Node-Red, now when I go to make a change and redeploy, I get an 'out of space' error like so:

Error: ENOSPC: no space left on device, copyfile '/data/home/root/.node-red/flows_einstein.json' -> '/data/home/root/.node-red/.flows_einstein.json.backup'

I can't find any way to actually check and confirm the storage space situation and don't have physical access to the device for a little longer.

Has anyone had storage space issues with the Cerbo before? Why would it have filled up? Log files? And how can I review this?

Any insights appreciated - thanks!

Hello all,

Seen a few posts but not any answers around this area. I have a 7.5kWh lithium ion LMO battery being charged by my Multiplus 48/2000 in a boat. I currently have the Multiplus configured with a battery 'storage' profile that floats the batteries at about 40% SoC voltage. I have another 'active' profile in VEconfigure3 that I can upload that charges the batteries to 90% SoC. Is there some way I can control this via my Cerbo's GX Touch? It doesn't look like I can choose battery profiles in VictronConnect via VE.bus dongle (which I do not yet have). Is this something an 'assistant' might help with? It's really just adjusting the absorption and float voltages. Perhaps even a physical switch on Cerbo's DI channel? I don't want to rely on Internet connectivity to do this via VRM and VEconfigure3 on a laptop.

New 500A SmartShunt installation in an RV with 2 12V batteries connected in parallel. The batteries are from 2015 but still working just fine. Full charge is 12.7-12.8. I have a knife type disconnect to take the batteries completely offline for storage as there are some small draws (parasitic) that circumvent the RV's "on/off" switch. So I turn that off and pull the knife switch which turns off all loads to the battery set. I installed the SmartShunt between the system negative loads and the knife switch attached to one negative terminal. Questions:

1. When I installed the SmartShunt, as soon as I attached the + wire to the battery the shunt went active even before I closed the knife switch. This means the circuit is finding ground somewhere else. There is a whole circuit through the battery isolation monitor (BIM) that reach the chassis (starter) battery to control charging from the generator and also from the chassis alternator. Also there are some 12V items that will run even with the knife switch open, for example the power step and the rear stabilizer jacks. So I assume this is OK that it started up immediately, but wanted to confirm that. (It was not measuring current to/from the battery bank because was not attached to them yet, but it was running with the blue light blinking ready to connect, and it did connect.)

2. For RV storage, I don't want the SmartShunt to stay in standby mode even thought it's a small draw. It is stored outside in deep cold (can be 0 to -20F). Should I disconnect the + line fuse to the shunt? Or just not worry about it at all?

3. For charge level, the manual recommends 13.2 which is my charge float level. But manual also says to set 0.2-0.3 below the float level. If I set it at 13.0, when would the charge level ever be reached since the charger will keep the level at 13.2? I'm inclined to go with 13.2 and ignore the advice to set below the float level??

4. The batteries are unlabeled and unbranded in any way but have a sticker "D27DG-160." The closest I can find anything on is D27DC-160. This shows a reserve capacity of 160 mins. @ 25A which is 66.66 aH. I would have thought the capacity to be higher but does that seem like a good number? If I double that for the two batteries I get 132 but would probably use a lower number given the batteries' age. Thoughts?

5. Every time I connect with the Smart Connect app, the Trends graph starts from scratch. It retains no history, so it's not possible to see "trends." The History tab retains its data but no matter how far I zoom out the graph, it shows only the last few seconds or minutes that the app is connected. As soon as I switch to another app, the history is lost. The manual states in the Trends section, "Providing that the firmware battery monitor is up to date, the battery monitor will store up to 45 days of past data." How can I capture and view the full history?

Thank you!

Hi my victron blue charger ip65 12/7a in storage mode is showing current of 3amp at 13.20v no other car or victron blue charger is showing any current in storage mode

Hi all. Last night @3am my Multiplus went a bit weird in so far as it dropped out of waiting to charge after a daytime discharge and went into storage mode with a 90% SOC left. The sun is now beaming on panels but not charging batteries nor suppling grid as per ess.

whats may be going on

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My batteries are currently full and in storage mode, but one is the multi plus putting almost 14.9v into my batteries when absorption is set to 14.4v

Hello!

I am planning a storage system (3 phase with Multiplus II 5000VA) for my existing two (10 kW and 17.5 kW - borth Fronius Symo) PV systems. The pv systems are located on a freestanding garage (ca. 40 m away). The meter box is in the house. Near the meter box is no space for the storage system. The storage system can be placed in an annex.

Layout 1:

The easiest implementation is given by following layout.

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But, I think, it is not possible with the Multiplus II. Is this right? K4 is used to guarantee the 1:1 rule.

Layout 2:

In this system layout, the Multiplus is either in the parallel or in series. The switching is done by the relays port of the Multiplus in connection with the contractor K11 and K3. The 1:1 rule is guaranteed by K4.

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The advantage is that at failure of the Multiplus the supply of the house is still guaranteed. Further, line losses is minimized. What is your opinion about it?

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