question

Juraj Nikolov avatar image
Juraj Nikolov asked

SOC releay assistent

Hi,

I want to ask, is more detailed documentation available regarding assistants?

I have a network switch and would like to use a relay from GX to control switching depending on the SOC. If the SOC reached 10%, the relay would switch signal eg NC(or NO), using which I would send an impulse to the grid switch, which would disconnect the PV and connect the distribution grid. If the SOC was at 50%, the relay would switch NO (or NC) and send a signal to switch the grid, where it would disconnect me from the grid and connect to the PV.
I'm just missing the documentation so I don't screw something up :)
Basically it is no science… but the documentation is terrible...

Someone help me, please :))


I want to stay off grid as much and as long as possible, even if I have a stable and available distribution grid. I want to use the distribution grid as little as possible and practically only as a backup. From this case I don't use ESS . A little strange design :))


Or are there paid trainings for this? :))


Many thanks for help.

SOCoffgridAssistants
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marekp avatar image marekp commented ·
@Juraj Nikolov

You are right, it is a strange design.

Let see.

When you still getting power from PV but SOC gets below 10%, you want to disconnect PV and get all power from grid.

Why you want to waste power from PV?

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Juraj Nikolov avatar image Juraj Nikolov marekp commented ·

@MarekP

ok, I'll try to make it a little more specific :)
At the moment I have enough power in PV panels, from March to October it is likely that this power will pull from PVp for my consumption. From October to February, I cannot expect 100% coverage from PVp, maybe 10~20% yes. If it would be controlled as I described, it is highly likely that the PVp will chargeg the batteries when I am disconnected from it. If the batteries reach a certain PVp level(SOC), it switches to operation and disconnects me from the network(grid). So I maximize the profit from solar even in winter, but how much, I don't know.

Does it make rational sense or not ?

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marekp avatar image marekp Juraj Nikolov commented ·
@Juraj Nikolov

Is there a reason why you do not want to use ESS system?

I am also, from March to October, not using any power from grid and augment my PV system with grid power from October to February, but I am not "jumping through hoops" with network switch but simply using ESS assistant.

One can get to the same point using different routs, but why choosing more cumbersome one.

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Juraj Nikolov avatar image Juraj Nikolov marekp commented ·

@MarekP

If there was no reason, I would use ESS :)


1) ESS does not guarantee you transfers to the network, there will always be transfers, even if small.

2) why should I throw away 1000 euros just to be able to flow into the grid and take power from the grid. For that money, I'd rather buy other components for the victron :)))

3) you don't want the liquidation fine you can get from the distribution, plus disconnection from the distribution as a bonus if you dont want them as a deposit, then ok : ))

This is how I have it galvanically separated, I meet their conditions... and it is safe for distribution technicans.


Thats it


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Trevor Bird avatar image
Trevor Bird answered ·

Hello @Juraj Nikolov . You could simply use the auto generator start function of the CerboGX to achieve those SOC switching points. The autostart function is perfect for this. A lot of documentation exists for generator autostart.

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Juraj Nikolov avatar image Juraj Nikolov commented ·

Thanks for the direction, I'll give it a try

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Juraj Nikolov avatar image Juraj Nikolov commented ·

@Trevor Bird

This doesn't work for what I need, relays on this my AST doesn't work for my purpose... :(
So I have to find another way:
Ideal solution is if the inverter could turn off if the SOC reaches a certain level of % and turn on again if the SOC reaches the level of %

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marekp avatar image marekp Juraj Nikolov commented ·
@Juraj Nikolov

Try reading about settings of Virtual switch.

There is an option called "dedicated ignore AC input" and there is a setting called "Do not ignore AC input" and

"when state of charge lower than (...)" in (...) you enter the desired SOC.

Maybe this will work for you.

I did not use it myself.

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Related Resources

Additional resources still need to be added for this topic

Victron Offgrid page

VEConfigure Assistants manual