Already posted this at Victronlive, but it seems like that is transitioning to this forum, so posting here as well.
I have an existing 48V 5kVA Quattro fed DC from 13.5KWp PV and 1200AH battery bank.
Power cuts are not infrequent and I have islanded some essential loads to be purely fed from this system.
I want an offgrid system, and I'd prefer not to add ESS unless I have to.
I want to add another identical Quattro to the system and add some less essential loads.
I understand how to conventionally parallel them.
And that it will effectively give me a 10kVA Quattro, but only the same features as I already have.
Q1. I would like to know if connect them in and upstream -downstream relationship would that give me the ability to have 10kVA available at the downstream inverter and the ability to loadshed one of the AC outs if my battery SOC was low. As I now would have 2 AC outs.
Q2. Would this also give me the ability to have a second battery bank that be configured to use a different DOD?
I realize the downstream inverter should not feed back power to the upstream inverter as the downstream inverter will not respond to a frequency rise like a Fronius PV inverter, if the upstream battery bank was full, the feed-in power would have nowhere to go.
Q3. Assuming this configuration is feasible. Would it exclude the addition of a Fronius PV inverter on the respective AC out of both inverters? I may add 5VA of PV inverter at each level of AC out, (1:1 rule applies), but because the everything is synced at the upstream inverter's frequency, it would appear that the 1:1 rule is now broken, is this permissible in the settings?
Q4. Assuming a single battery bank and no additional PV inverters, for the moment are there any special setting requirements and which assistants would be best suited to achieve this?