question

Nicholas Wessels avatar image

Programmable Relay Assistance - Turn on Ac2 during grid outage

I would like to do the following with a programmable relay on our Quattro 48/5000 with CCGX running ESS:

By default, if there is a grid outage, AC2 automatically gets turned off by the Quattro. We have non-critical loads like pool pump, washer, aircons on Ac2.

If there is sufficient PV power as per the below screenshot then I would like to turn on the AC2 relay (AC2 relay is on in the below screenshot):

So these are the conditions I would like to use for the programmable relay:

Turn the relay ON if:

1. If battery dc voltage is over 50v (indicates we have PV power)

2. AC Loads are NOT greater than 2500w

3. There are no LED Low Battery warnings

4. AC1 is not available (grid outage)

Turn relay OFF if:

1. Battery dc voltage drops below 48v (no PV or low battery)

2. There are any low battery pre-alarms

3. AC1 is not available (grid outage) - this is so that Ac2 does not get turned off when there is grid power and we are running ESS

Below is a screenshot of how I have the assistants configured now:

What is happening now is that when there is no AC1 available (grid outage) then AC2 still stays off.

If I remove the assistants circled in red in the screenshot, then AC2 turns on during a grid outage.

There must be a logic conflict somewhere here.

If anyone see anything I've done wrong here, I would really appreciate some assistance.

MultiPlus Quattro Inverter ChargerCCGX Color ControlESS
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You are using 'when AC-in not available for 10 seconds' in both relay settings.

I think you don't want to have the 'not available for 10 seconds' in the 'off' relay, and you want 'when AC-in [is] available for 10 seconds' in the 'on' relay.

Nicholas Wessels avatar image Nicholas Wessels Daniël Boekel (Victron Energy Staff) ♦♦ ·

@Daniël Boekel (Victron Energy Staff) will this not result in AC2 being turned off even when there is AC1 (grid power) available? When ESS is running battery voltage can drop below XX volts even when Grid Power is available.

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Daniël Boekel (Victron Energy Staff) avatar image
Daniël Boekel (Victron Energy Staff) answered ·

This is how I do it in my boat, a bit simpler but it works for me (lithium battery that can take the power easily)


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@Daniël Boekel (Victron Energy Staff) thank you.

Will your above settings not however turn Ac2 off when DC Input voltage is lower than 51 volts EVEN when there is Grid Power (in your case Shore Power) available?

Hi @Nicholas Wessels

No, It will go 'on' when AC-in is available, and/or when voltage above 51,5V

Nicholas Wessels avatar image Nicholas Wessels Daniël Boekel (Victron Energy Staff) ♦♦ ·

@Daniël Boekel (Victron Energy Staff) this is what I have now configured and running below:

So we just lost grid power and DC is below 50v but AC2 is now still on:

Not sure what I am doing wrong?

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The programmable relay assistant is begging for comprehensive documentation. I've posted questions here that have been left unanswered.


That said, I think your current problem is documented somewhere. When you specify multiple conditions within a single instance of the assistant, it's an "OR" condition. The action will be performed if any of them are true.

AC2 is probably still on because the load is under 2500W. Even if the load was higher, it would be on because there has been no low battery pre-alarm.


Nicholas Wessels avatar image Nicholas Wessels Daniël Boekel (Victron Energy Staff) ♦♦ ·

This programmable relay assistant should allow the option to select the operator for each of the conditions.

So there should be an option to select "AND" or "OR".

Right now it makes very little sense the way it works. It is almost random which condition is used first. So at the moment there is no reason to select multiple conditions because they use "or".

In the below example AC2 will always be on when I select:

1. If battery dc voltage is over 50v (indicates we have PV power)

2. AC Loads are NOT greater than 2500w

3. There are no LED Low Battery warnings

4. AC1 is not available (grid outage)

Because one of the above conditions will ALWAYS be met.