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rag avatar image
rag asked

Victron minimal setup

hi,

I have 2 eg4 batteries(48v, lifepower4). I plan on buying a multiplus2 48v. Do I need anything else to configure this setup? Assuming I can install the ve-configure sw on pc and connecti without any other adapters in-between?


Couple of other questions:

- I don't think the eg4 batteries can communicate with multiplus as per other threads. Is there any danger of it being overcharged or drained fully

- I plan to charge the batteries at night and discharge during the day. Assuming this is possible with ve-configure

- anything else I need to be aware of?


thank you

Multiplus-IIvictron
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4 Answers
Alexandra avatar image
Alexandra answered ·

@rag

You will need an mk3 to usb adaptor to program (unless you want to use a gx and do it over the vrm.)

You program in the correct battery chemistry and charge parameters including the low dc cut off and you will be fine. I have a few systems in with what are considered dumb smart lithium batteries without issues. Most of the time if the parameters are incorrect the battery protects itself anyway.

The charge a discharge schedule can be done through either the GX with programmable times, or other methods with contactors depends on how you want to tackle the issue. Or a combination of both.

There is also the option of node red which is a bit more advanced.

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rag avatar image rag commented ·
thank you @Alexandra. I have configured a raspberry pi instead of the gx. I was looking at the ESS assistant/ve.configure and it wants a grid type. Do you know what grid type I should use for the US? (I don't see one in the list)
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Alexandra avatar image Alexandra ♦ rag commented ·
@rag

A RPi is considered to be a GX device in your installation.

There is no grid code for the US.

I am not sure of the legal implications of installing or having it on your system. We use grid code other where we are in Africa, but then laws here are not so strict, here, there is just one requirement and that is we do not feedback without permission/correct meter.

Are you in a mobile installation? In that case you should not use ESS at all.

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rag avatar image rag Alexandra ♦ commented ·

hi @Alexandra,

It is a home installation. I am not sure if ESS assistant is the correct way but what I want to do is charge my batteries at night and discharge during the day. Is there another way, other than ESS, to do that?

I have attached an image of what it kinda would look like(no solar)

bat.jpeg


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bat.jpeg (116.8 KiB)
rag avatar image rag rag commented ·

couple of more questions:

- I have a 40 amp AC in circuit breaker and an AC output 40 amp breaker. Both 8 awg cable. The below is from the multiplus manual. Assuming my wiring is ok. Do I need to change out my breaker to 30 amps on both sides or 40 is ok?

>AC input current limit 32 A for 3kVA and 50 A for 8kVA and 10kVA (= adjustable current limit for PowerControl and PowerAssist functions)


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shaneyake avatar image shaneyake rag commented ·
What state are you in? Using ESS in the US varies quite a bit by state as the inverter is not UL listed.


Which Multiplus-2 did you end up getting?

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rag avatar image rag shaneyake commented ·

oh, did not know that. I have not put in the order yet. I was planning on getting multiplus 48v/3000 I am in Texas and not planning to sell anything back to the power company. It will be an offgrid system. AC-in to the inverter is from the grid though

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Alexandra avatar image
Alexandra answered ·

@rag

With no solar and ESS being a debated legal issue, i would say then an AC ignore system would be more ideal.

There are several ways to acheive it.

1. You can use and external mcb timer switch to connect and disconnect.

2. You can use a GX and run the grid lile a generator. There is an article here for that. It is slightly more complicated than the mcb timer. Not sure if you planned on having one.

3. There is node red, but as a new person maybe something you can play with later. Also requires the GX.

4. Using virtual switch - or condional connect, but this cannot be time based.

Your incoming breaker is fine. The input current limit can be set easily. The output depend on the circuits you are running.

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rag avatar image rag commented ·
hi @Alexandra, 2, 3, & 4 looks like a good option. mcb timer - think I have to do some wiring/install changes. Could you give me some more info on 3 & 4?


thank you


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Alexandra avatar image Alexandra ♦ rag commented ·
Sure. Virtual switch.

Node red here is the start document. On Victron Professional there is a training session coming up at end of November. So sign up there to catch it. And a dedicated topic on the forum.

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rag avatar image
rag answered ·

hi @Alexandra , @shaneyake - Does the ESS rules only apply if you are sending energy back to the grid? I don't plan on doing this. It is an offgrid system with AC-in from Grid. Assuming Multiplus II 3k / 48v is good for this..let me know if it is not the case

thank you

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Alexandra avatar image Alexandra ♦ commented ·
@rag

ESS features are designed for on grid use. So really not much use off grid.

And if you install a grid code sometimes a generator can be a fiddle to be accepted by the inverter as it almost has to be grid quality.

So in both the ESS and grid code unnecessary or useful in an off grid setup.

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rag avatar image
rag answered ·

1 - Charger Only
2 - Inverter Only
3 - On
4 - Off

So how do you do mains on, charge off? I basically don't want the battery charging when #3(ON) is chosen. Right now it goes 'mains on, bulk on'. Need bulk off

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shaneyake avatar image shaneyake commented ·

The inverter can go into passthrough mode but unfortunately I don't know how to do that without enabling ESS.

You can lower your input current limit to match your loads which would stop it from charging but could also result in it discharging so you might need some logic to change current limit as loads increase.

You can also use the AUX1 input on the inverter to limit the charge current.

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rag avatar image rag shaneyake commented ·

it is kinda working..so I have it set to 'charger only' at 8 pm. It switched to bulk-->float-->off and all loads seem to be running via grid, which is good. I have it set to 'inverter only' at 6 a.m so it should work(hopefully).

1) when in off state lot of stats go away..hmm

2) When it switches from inverter to charge, it shuts down all the equipment for 30 seconds so all the clocks/etc need to be reset. Anyway for it to not shut down before it switches state?


thank you


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shaneyake avatar image shaneyake rag commented ·
1) Which stats are you looking for? Most things still update like input voltage, frequency, etc.


2) Do you have the UPS option enabled in VE.Config? This isn't normally, I don't even notice the switch from on to off grid.

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rag avatar image rag shaneyake commented ·

It worked perfectly today. Previous day, the raspberry pie booted up and the ip address changed so I think it had some communication problem. Today it went from float --> inverterting. No 'off'. Actually there is off in the below chart and that is during the switching.

1) I am looking at the advanced tab on victron connect which shows a chart with all the states (attached)screenshot-from-2022-12-06-07-51-16.png

2) UPS is on and I tested it and 20ms failover works great. This is exactly what I would like to see when switching from inverter to charger and back. How can we do that without it going to the off state (tiny spec in the chart above). It restarts all my devices(when it switches to 'off' for a brief period). That is a hassle. Any ideas?

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shaneyake avatar image shaneyake rag commented ·

You shouldn't be switching to Charger only mode. Also if grid is lost the inverter will shutdown.

But you can try switching from Inverter only to On, wait for it to sync and then switch to charger.

The best way to do this is actually using ESS in Mode3, this would give you full charging control in NodeRed. You can set the feed-in flag to disable so that it never inverters when connected to grid.

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rag avatar image rag shaneyake commented ·

>You shouldn't be switching to Charger only mode. Also if grid is lost the inverter will shutdown.

hmm..ok

>But you can try switching from Inverter only to On, wait for it to sync and then switch to charger.

let me try that

>The best way to do this is actually using ESS in Mode3, this would give you full charging control in NodeRed. You can set the feed-in flag to disable so that it never inverters when connected to grid.

You mean ESS node in node-red? Do you have an example of this? I am in OFF-Grid mode

thank you

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Related Resources

Additional resources still need to be added for this topic

MultiPlus-II Product page 

MultiPlus-II Manual

Multiplus-II GX Online Manual

MultiPlus-II 230V Datasheet 

VE.Bus Error codes