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July 12, 2025 4:59 pm
Hi All,
I've hit the wall. I've watched many YouTube vids and read through 3 of the wiring diagrams from EG4 for the Gridboss and 12000XP/6000XP etc, but can't find out how to provide power to my existing subpanel in my garage, if it's even possible without a critical loads panel.
I would prefer to not use a critical loads panel. I would like the 12000XP to feed my Subpanel power, the issue is I also have a 40 amp breaker in this panel that is my current Solar system feeding back to the grid. I do not want to feed power back to the grid from the Inverter.
A perfect setup would be from my 12000XP to the subpanel, and if the inverter dies or quits, then power to the subpanel would be fed from the grid.
On an off topic, I would like to be able to bypass the inverter altogether, should it fail to work and need to be repaired, I suppose I would need a manual transfer switch to direct power from the grid directly to the panel (as it is now).
I'll include my subpanel picture, it's nothing special, 100 amp power, with a bunch of breakers, and again one of those double pole breakers is my Solar feeding back to PGE NEM2.
Thank you
July 14, 2025 8:41 pm
From the manual it looks like you could land your AC Coupled solar on the 12000XP's Smart Port.
11.2 AC COUPLING The smart load port allows the user to AC couple, by adding onto an existing grid tied solar system. PV comes from the existing system while the AC coupled inverter controls battery charging and any extra PV coming into the system. This setting allows the user to still have power off-grid. The inverter can accept PV inputs to both MPPT channels and AC coupled solar input simultaneously. The AC coupled solar input can be up to 62.5A of AC power while the MPPT channels can handle up to 24kW of solar. Off-grid inverters such as the 12000XP are capable of AC coupling, but not of selling back energy to the grid. To enable AC coupling or configure AC coupling settings, ensure the inverter is in standby mode.
As far as powering your existing subpanel it seems like it's grid power input would go to your XP. Then your XP's output would go to the subpanel.
I think the odds are low you would need to totally bypass the XP but no reason to make it complicated since it be temporary. Just use some polaris connectors or the like for the temp. bypass?
