question

I think you mean the BMV-712!?

This is in the manual about the relay:

The relay contacts inside the BMV are rated at 1A up to 30V DC.
These contacts will not switch your contactor directly. You'll need to drive another relay with suitably rated contacts or some other sort of driver suitable for your contactor coil.
The relay contacts in the BMV are potential free, you need to provide the power to drive external circuits.
Any time you drive a relay or contactor coil, you need a flyback diode otherwise the back EMP when the power is disconnected will damage electronics or arc contacts.

The specifications for the relay contacts in the BMV are in the BMV manual on page 39 here:
https://www.victronenergy.com/upload/documents/Manual-BMV-700-700H-702-712-EN-NL-FR-DE-ES-SE.pdf

yes, sorry, thanks for the correction! So, that means my 12 VDC contactors should be compatible with the 712, correct and I shouldn't need to provide a standalone 12V power source for them?

This is probably a dumb question but I only see outputs on the back of the 712 for one relay (one NO, one NC, and one common) but I need to operate two contactors, one for high voltage to disconnect solar to charge controller and lone ow voltage disconnect for the loads. I don't understand how I can do that with only one set of relay output connectors?

sorry, just getting used to this site and didn't notice that I can reply to comments individually. my reply was to matthias before i saw wkirby's post. unfortunately, i am stretching as is and apparently don't know enough to design the arrangement wkirby describes. i have no idea how i would determine what additional relay i would need (or how to wire it in). i do have a standalone 12V power supply that sounds like i would need to use to power the relays and i assume i would use the additional relay wkirby mentions in series with that supply to run the final contactor? i would think though that with a the 712 commonly being used on a nominal 48V bank that i'm not the first noob to try to use 12VDC contactors so i am hoping someone will pipe in with the idiot proof method! also, still confused how two relays can be operated with only one set of outputs.