Grid tied AIO inverter and essential loads/high load sub panel. Schematic check please?

[JOA-MON]

I would like to use an EG4 12k XP to utilize battery power for the higher load circuits during peak grid hours and then use the EG4 12k to charge the battery bank during "super off peak" hours between midnight and 6am. I plan on installing a sub panel and moving over my higher load circuits as well as some essential loads from the main panel to the sub panel. Use the EG4 12k connected to a 2 vertical wall battery towers to power the sub panel during peak hours and then have the grid power the panel while my EG4 recharges my batteries from the grid between midnight and 6am. Below is the schematic of how I was planning on doing this. It makes sense to me. I could also use an interlock on the main panel instead of a transfer switch which I feel like are interchangable design options.

I could save a lot of money this way while also having the benefit of a battery back up for essential loads if the grid goes down. Please let me know if there is a better way of doing this that incorporates the redundancy I am looking for. I know the transfer switch is not really necessary as I could just use only the EG4 12K on pass through to power the sub panel but I like the redundancy of if the inverter goes down then I can just switch back to grid by pulling the transfer lever until I get the inverter back on line.

 

[Everhard]

Hopefully some knowledgeable members chime in! I'm hoping to do basically the exact same thing!
I'll add the following points:
1 zero pass thru to grid but assuming extra power "left over" and can be "pushed" to main panel. (I plan to add pv as well.)
2 chargeverter between batteries and inverter to be able to connect "dirty" generator during power outage to charge batteries and support critical loads within limits of the size of the generator and loads.

Thanks,
E.

 

[1201]

Yes, pretty straight forward, but only put essential loads (not your high loads) on the critical loads panel because remember the hybrid will send power back to your main panel to supply those loads as well.

I prefer the growatt sph 10000 over the eg4 12k.

 

[JOA-MON]

Yes, pretty straight forward, but only put essential loads (not your high loads) on the critical loads panel because remember the hybrid will send power back to your main panel to supply those loads as well.

I prefer the growatt sph 10000 over the eg4 12k.

Thanks for the response. I will look at that inverter. As far as the critical loads vs high loads thing. The AIO wont be back feeding the main panel because of the transfer switch. The batteries will supply all critical loads and high loads during higher cost energy times and then the battery bank will recharge during "super off peak" hours of midnight to 6a. So what I will do is basically throw the transfer switch when I go to bed at 10p so the main panel and sub panel are powered by the grid. Then before I go to work I throw the transfer switch back over and the sub panel is powered by the AIO/battery bank. Throughout the day and peak hours of 4p-8p. Thats why I am going for an off grid inverter and not a hybrid since I do not want ot backfeed the grid.

 

[JOA-MON]

Hopefully some knowledgeable members chime in! I'm hoping to do basically the exact same thing!
I'll add the following points:
1 zero pass thru to grid but assuming extra power "left over" and can be "pushed" to main panel. (I plan to add pv as well.)
2 chargeverter between batteries and inverter to be able to connect "dirty" generator during power outage to charge batteries and support critical loads within limits of the size of the generator and loads.

Thanks,
E.

The way I understand it, the AIO inverters usually have a "gen" input in them for you generator to be hardwired to it so you can switch to gen pass through or use the gen to charge the batteries. Maybe someone with some knowledge will verify that.

 

[1201]

Thanks for the response. I will look at that inverter. As far as the critical loads vs high loads thing. The AIO wont be back feeding the main panel because of the transfer switch. The batteries will supply all critical loads and high loads during higher cost energy times and then the battery bank will recharge during "super off peak" hours of midnight to 6a. So what I will do is basically throw the transfer switch when I go to bed at 10p so the main panel and sub panel are powered by the grid. Then before I go to work I throw the transfer switch back over and the sub panel is powered by the AIO/battery bank. Throughout the day and peak hours of 4p-8p. Thats why I am going for an off grid inverter and not a hybrid since I do not want ot backfeed the grid.

Will you have a grid interconnection agreement?

If yes you are way overcomplicating it

 

[JOA-MON]

Will you have a grid interconnection agreement?

If yes you are way overcomplicating it

No sir. That is why I am trying to ensure complete separation from AIO and grid at the main panel.

 

[1201]

No sir. That is why I am trying to ensure complete separation from AIO and grid at the main panel.

then you need an off grid inverter.

 

[JOA-MON]

then you need an off grid inverter.

Agreed. That is why I said the EG4 12k XP not a PV. Maybe I missed something.

 

[1201]

Agreed. That is why I said the EG4 12k XP not a PV. Maybe I missed something.

sorry, thought you were referring to the 12k pv