question

robertfry avatar image

Hub1, option 3

@alexandra

could you help or maybe recommend someone? been going a week now but the last 2 days system keeps battery state of charge around 52%. Doesn’t go any higher or fully charge batteries



Multiplus 24/3000/70

Mppt 150/70 tr

BMI 700

Cgx unit


I am connected to grid but don’t have a two way meter. Weather in uk pretty overcast at the moment so unit is only trying to send a few watts back to mains, showing on overview as -7, or -5 or no mains.

What will happen when gets sunnier this week and unit try’s to send more kw back to mains. Will it just go back to mains through the incoming, or is the unit just thinking it’s sending excess electric back when in fact it’s not.

To officially export back to grid, I need accreditation which is not possible for self install using second hand equipment.

Options 1 and 2 don’t fit my preference.

Option 4 is deprecated.

Can I just have option 3 but no excess back to grid?



MultiPlus Quattro Inverter Charger
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2 Answers
Alexandra avatar image
Alexandra answered ·

@robertfry

Do I understand this correctly.

Your needs are: -

You want to keep batteries charged when connected to grid.

No feedback to grid.

Solar to aid consumption if connected to grid and it is sunny?

Hub 1 option three has a warning - it needs an anti-islanding device

(something like this one - https://www.victronenergy.com/accessories/ziehl-voltage-frequency-sensitive-relay-ufr1001e#manual)

1623348510944.png


Do you have a grid code set on the unit?

Would you prefer the unit disconnected entirely if it does not need the grid at all?



1623348510944.png (4.5 KiB)
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Alexandra avatar image
Alexandra answered ·

Other possible options are

https://community.victronenergy.com/storage/attachments/3299-virtual-switch-ignore-ac-lesson.pdf

https://www.victronenergy.com/live/assistants:ignore_ac_input_using_the_generator_assistant

Or using the CCGX relay with a contactor and the generator start stop progrmmable on the GX to connect and disconnect to the grid.

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