question

tas6 avatar image
tas6 asked

Controlling a Dump load on AC2 Out using assistants depending on SOC AND charging level

Off Grid installation with 8.2 KW Fronius AC coupled on AC1 Out and 10000VA quattro

I have successfully set the relay assistant to switch on the AC2 Out relay when SOC is above 92% and off when SOC drops back to 91%

However when a cloud for example comes over and my PV drops significantly I want the AC2 relay to temporarily switch off again until it clears

I am thinking to use an additional relay assistant to switch AC2 off if batt voltage drops below 50.5 volts and on again when above 51 this i think would mean i only load AC2 when i am truly in surplus generation mode??

MultiPlus Quattro Inverter ChargerFroniusAssistants
1 comment
2 |3000
Toggle Comment visibility. Current Visibility: Viewable by all users

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

drcom avatar image drcom commented ·
How can you achieve that AC2 Out depending on SOC?

Would you share your solution?

Or maybe just some hints on how to do it?

Thank you


0 Likes 0 ·
3 Answers
mrhappy avatar image
mrhappy answered ·

One way is to use an external contactor with an NC connection, connect AC2 to its input and the dump load to its output, and drive the contactor with one of the relays in the quattro separately.


8 comments
2 |3000
Toggle Comment visibility. Current Visibility: Viewable by all users

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

shaneyake avatar image shaneyake commented ·
Why would this help?
0 Likes 0 ·
Show more comments
pwfarnell avatar image
pwfarnell answered ·

Would the method outlined in this post help because using the generator start assistant with the relay sense reversed means that the on conditions for the dump load are AND, i.e. you need to have both the voltage and SOC high to start the dump load. The off settings are then effectively OR, only one of the SOC or voltage needs to be low to stop the dump load. I have this programmed up for my Multiplus but have not yet loaded or tested it. The linked page shows power draw and SOC but you can also use battery voltage as a trigger.

https://community.victronenergy.com/questions/57414/help-with-assistants-to-use-ac2-as-dumload.html

2 |3000
Toggle Comment visibility. Current Visibility: Viewable by all users

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

harold avatar image
harold answered ·

I think you can control it by the right order of the programmed assistants, for on and off!

2 |3000
Toggle Comment visibility. Current Visibility: Viewable by all users

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.