Pylontech SoC based AC ignore?

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snoobler asked Aug 15, '23

Pylontech SoC based AC ignore?

Please check my config and confirm it will work based on Pylontech BMS supplied SoC:

Desire: ignore AC input at 60% and above. If drop below 60%, use AC input for 30 minutes.

The programmable relay says "State of Charge (internal battery monitor)" - implies it has to be the Quattro's battery monitor. Does this need to be enabled in VE Config? If so, will the Pylontech BMS supplied SoC override the Quattro Battery Monitor?

Assistants:

general flag user
programmable relay
relay locker

general flag:

programmable relay:

relay locker:

Thanks!

MPPT Controllers VRM

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snoobler commented · Aug 16, 2023 at 07:23 AM

Hmmm... rather than relay locker, I suspect I need two programmable relays:

turn ON above 90% (to ignore AC input and terminate charging)

turn OFF below 60% (to use AC input and initiate charging)

So no more "charge for 30 minutes" behavior... simply stop using AC input above 90% and start using AC input below 60%.

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JohnC answered · Aug 16, 2023 at 08:11 AM

Hi @snoobler

That "State of Charge (internal battery monitor)" is some sort of throwback. I've previously pointed out that it's misleading, but it remains. Just disable the SOC in the Quattro to make sure. The SOC from the Pylons should be passed across to the Assistants, with no DVCC involvement either. A Smartshunt SOC certainly gets passed across and can be used by Assistants, but if you had both I don't know how that would be dealt with.

Yes, it's normal to have to use two instances of PR. Regardless of the Relay Locker.

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Alexandra answered · Aug 16, 2023 at 12:24 PM

@snoobler

The VE bus SOC does synchronise with BMS SOC.

The ignore AC is easily done with the generator assistant.

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Answer 1 · 2023-08-16T07:31:52Z

Paul B answered · Aug 16, 2023 at 07:31 AM

the SOC is taken from the Quattros internal Battery Monitor only when using the Assistants

Suggest you use battery voltage instead

Also if you use a Assistant to ignor AC in then you also have to use a Asistant to turn it back on as well

and of note you may find the on really turns the ac 1 in relay Open and off closes the AC1 in relay

So test it to make sure you get it the correct way around

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Answer 2 · 2023-08-16T07:51:44Z

snoobler answered · Aug 16, 2023 at 07:51 AM

Thanks.

I'm successfully doing it with VS and voltages. Would prefer to do it with SoC.

For some reason, I thought the Quattro SoC would be overridden by the BMS SoC.

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Answer 3 · 2023-08-16T13:17:35Z

snoobler answered · Aug 16, 2023 at 01:17 PM

@Alexandra @JohnC

Thank you both. I think I got there in my second post indicating the need for a second PR. I had encountered the use of the generator assistant, but I didn't grasp the function at a glance. Having gone through the assistants, I think I have it as follows:

Thanks again!

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