question

paulbloggs avatar image
paulbloggs asked

Disable AC ignore at night

Morning,

I have my Multiplus II using the virtual switch to ignore ac and use solar and battery power. This works well during the day when there is sun.

But I would like it to switch to bypass or ac during the nighttime when there is no sun. And save the batteries from being charged and discharged.

I was thinking of using an external time switch but how do I connect this to the multiplus?

I also have a raspberry pi running Venus OS if that will help.

Regards

Paul

Multiplus-IIvirtual switch
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zl2fae avatar image zl2fae commented ·
I too see value in this especially in winter when the solar energy is low. We have low rate power (half price) from 9:00 pm until 7:00am and want to use it to top up the battery in winter. Currently I am manually flipping the ignore AC using the new portal option ( previously uploading a day and night config manually ). I still want to “rules base it” but don’t want to have to add additional hardware. I’ll explore Node Red.
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jasonandress avatar image jasonandress zl2fae commented ·
Can you tell me how you flip the ignore ac in the Victron portal. I assume you mean victron VRM.


Thanks

Jason

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2 Answers
Matthias Lange - DE avatar image
Matthias Lange - DE answered ·

I think what you are looking for is the ESS:
https://www.victronenergy.com/live/ess:start

With the ESS-Assistant in the Multi you will use solar power as primary power source.
If there is not enough solar power you will use the battery until the battery is empty.
If there is not enough solar power and the battery is empty you will pass-trough the grid (without charging the battery).
On the next day the solar power is again used as primary power source for your loads and surplus power will be used to charge the battery.

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paulbloggs avatar image
paulbloggs answered ·

Hi Matthias,

I don't want to use the battery if I don't have to. They are old and have reduced capacity. We have load shedding in South Africa so I need to keep the batteries full for when that happens.

At the moment during the day when there is sun or not everything works well but at night the batteries discharge to 90% and then charge up again which is wasteful.

That is why I want to turn off "ignore ac" in the evening and back on in the mornings.

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Matthias Lange - DE avatar image Matthias Lange - DE ♦ commented ·

With ESS you can also setup a minimum SOC or select "keep batteries charged".
With this options the battery will only be discharges to the set SOC or the battery will be only used if the grid fails.

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